Lewiston, Idaho Weather Conditions

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Current Conditions

  • 66°
  • Mostly Cloudy
  • Wind: ENE 5 mph
  • Humidity: 42%
  • Visibility: 10.0 miles
  • Dew Point: 42°
  • Pressure: 29.85 in. -

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Next 12 Hours

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5  pm
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11  pm
2  am
Mostly Cloudy
Mostly Cloudy
Chance of Rain
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66°
59°
55°
54°
55°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Wednesday
  • Chance of Rain
  • High: 68 °
  • Low: 50 °
  • Chance of Rain
  • Thursday
  • Rain Showers
  • High: 63 °
  • Low: 45 °
  • Rain Showers
  • Friday
  • Rain
  • High: 59 °
  • Low: 45 °
  • Rain
  • Saturday
  • Mostly Cloudy
  • High: 72 °
  • Low: 46 °
  • Mostly Cloudy
  • Sunday
  • Partly Cloudy
  • High: 57 °
  • Low: 39 °
  • Partly Cloudy

Forecast for Lewiston, Idaho

Updated: 2:00 PM PDT on October 22, 2014

  • Wednesday

    Mostly cloudy in the morning, then overcast with a chance of rain. High of 68F. Winds from the SSE at 5 to 15 mph. Chance of rain 30%.

  • Wednesday Night

    Overcast with a chance of rain. Low of 50F. Winds from the SE at 5 to 10 mph. Chance of rain 50%.

  • Thursday

    Mostly cloudy with rain showers, then a chance of rain in the afternoon. High of 63F. Winds from the SSW at 5 to 10 mph shifting to the WNW in the afternoon. Chance of rain 60%.

  • Thursday Night

    Partly cloudy with a chance of rain. Fog overnight. Low of 45F. Winds less than 5 mph. Chance of rain 50%.

  • Friday

    Overcast with rain. High of 59F. Winds from the ESE at 5 to 10 mph. Chance of rain 60%.

  • Friday Night

    Overcast in the evening, then partly cloudy. Low of 45F. Winds from the ESE at 5 to 10 mph.

  • Saturday

    Overcast. High of 72F. Winds from the SE at 5 to 10 mph.

  • Saturday Night

    Partly cloudy. Low of 46F. Winds from the SSW at 5 to 10 mph.

  • Sunday

    Partly cloudy. High of 57F. Breezy. Winds from the WSW at 10 to 20 mph.

  • Sunday Night

    Partly cloudy. Low of 39F. Winds from the SW at 5 to 10 mph.

  • Monday

    Partly cloudy. High of 59F. Winds from the WSW at 5 to 10 mph.

  • Monday Night

    Partly cloudy. Low of 37F. Winds less than 5 mph.

  • Tuesday

    Mostly cloudy with a chance of rain. High of 61F. Winds from the ESE at 5 to 10 mph. Chance of rain 50%.

  • Tuesday Night

    Partly cloudy with a chance of rain. Low of 41F. Winds from the SW at 5 to 10 mph. Chance of rain 60% with rainfall amounts near 0.3 in. possible.

  • Wednesday

    Mostly cloudy with a chance of rain. High of 59F. Winds less than 5 mph. Chance of rain 20%.

  • Wednesday Night

    Partly cloudy. Low of 41F. Winds less than 5 mph.

  • Thursday

    Partly cloudy. High of 57F. Winds less than 5 mph.

  • Thursday Night

    Clear. Low of 37F. Winds less than 5 mph.

  • Friday

    Mostly cloudy with a chance of rain. Fog early. High of 55F. Winds less than 5 mph. Chance of rain 30%.

  • Friday Night

    Overcast with a chance of rain. Fog overnight. Low of 37F. Winds less than 5 mph. Chance of rain 40%.

  • Saturday

    Mostly cloudy with a chance of a thunderstorm. Fog early. High of 54F. Winds less than 5 mph. Chance of rain 40%.

  • Saturday Night

    Partly cloudy with a chance of a thunderstorm. Low of 36F. Winds less than 5 mph. Chance of rain 40%.

  • Sunday

    Clear. High of 50F. Winds less than 5 mph.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Normal Hill Weather Station, Lewiston, ID

Updated: 3:20 PM PDT

Temperature: 66.4 °F Dew Point: 18 °F Humidity: 15% Wind: Calm Pressure: 31.01 in Hourly Precipitation: 0.00 in Graphs

Location: Nick's Weather Station, Lewiston, ID

Updated: 3:20 PM PDT

Temperature: 67.7 °F Dew Point: 45 °F Humidity: 44% Wind: NE at 4.0 mph Pressure: 29.82 in Hourly Precipitation: 0.00 in Graphs

Location: Harvest Vista/Pheasant Trail Estates @ Schaub Ranch, Lewiston, ID

Updated: 3:20 PM PDT

Temperature: 66.2 °F Dew Point: 43 °F Humidity: 43% Wind: East at 1.0 mph Pressure: 29.77 in Hourly Precipitation: 0.00 in Graphs

Location: Clarkston Heights, Clarkston, WA

Updated: 3:20 PM PDT

Temperature: 67.6 °F Dew Point: 47 °F Humidity: 47% Wind: ESE at 5.1 mph Pressure: 29.89 in Hourly Precipitation: 0.00 in Graphs

Location: HADS ALPOWA CREEK AT MOUTH NEAR CLARK WA US WADOECO, Clarkston, WA

Updated: 2:15 PM PDT

Temperature: 68 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Graphs

Location: ITD Cottonwood ID US, Juliaetta, ID

Updated: 2:30 PM PDT

Temperature: 65 °F Dew Point: 43 °F Humidity: 45% Wind: ENE at 2 mph Pressure: - Hourly Precipitation: 0.00 in Graphs

Location: MesoWest Alpowa Summit WA US WA DOT, Pomeroy, WA

Updated: 2:10 PM PDT

Temperature: 59 °F Dew Point: 40 °F Humidity: 49% Wind: SE at 12 mph Pressure: - Hourly Precipitation: 0.00 in Graphs

Location: Town of Colton, Colton, WA

Updated: 3:19 PM PDT

Temperature: 60.5 °F Dew Point: 37 °F Humidity: 41% Wind: ESE at 4.0 mph Pressure: 29.80 in Hourly Precipitation: 0.00 in Graphs

Location: Wawawai -Baker Ranch -South Rim, Colton, WA

Updated: 12:20 PM HST

Temperature: 59.6 °F Dew Point: 41 °F Humidity: 50% Wind: North at 4.0 mph Pressure: 29.91 in Hourly Precipitation: 0.00 in Graphs

Location: Westview, Moscow, ID

Updated: 3:07 PM PDT

Temperature: 59.2 °F Dew Point: 40 °F Humidity: 50% Wind: SSE at 3.0 mph Pressure: 29.89 in Hourly Precipitation: 0.00 in Graphs

Location: Lamb Road, Troy, ID

Updated: 3:16 PM PDT

Temperature: 60.0 °F Dew Point: 42 °F Humidity: 52% Wind: SE at 4.0 mph Pressure: 29.88 in Hourly Precipitation: 0.00 in Graphs

Location: RAWS MISSION CREEK ID US, Winchester, ID

Updated: 2:03 PM PDT

Temperature: 61 °F Dew Point: 35 °F Humidity: 37% Wind: South at 20 mph Pressure: - Hourly Precipitation: 0.00 in Graphs

Location: Montgomery Ridge Road, Anatone, WA

Updated: 3:15 PM PDT

Temperature: 62.5 °F Dew Point: 36 °F Humidity: 38% Wind: SE at 10.5 mph Pressure: 29.93 in Hourly Precipitation: 0.00 in Graphs

Location: Reubens-ID, Reubens, ID

Updated: 2:50 PM PDT

Temperature: 58.5 °F Dew Point: - Humidity: 46% Wind: North at - Pressure: 26.30 in Hourly Precipitation: 0.00 in Graphs

Location: Camas Prairie, Reubens, ID

Updated: 3:20 PM PDT

Temperature: 58.4 °F Dew Point: 38 °F Humidity: 47% Wind: SSW at 25.3 mph Pressure: 29.88 in Hourly Precipitation: 0.00 in Graphs

Location: ITD Winchester ID US,

Updated: 9:29 PM GMT

Temperature: 59 °F Dew Point: 35 °F Humidity: 40% Wind: South at 11 mph Pressure: - Hourly Precipitation: 0.00 in Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion 
National Weather Service Spokane Washington 
227 PM PDT Wednesday Oct 22 2014 


Synopsis... 
a very moist frontal boundary will produce heavy rain and high 
elevation snow for the mountains and steady rain in the valleys 
and basin tonight. Breezy and unsettled conditions will continue 
through Thursday. A strong cold front will produce windy conditions 
Saturday night into Sunday morning. The pattern will continue to 
be active into early next week. This includes the potential for 
widespread rain into early next week, as moisture associated with 
former typhoons makes its way toward the Pacific northwest. 


&& 


Discussion... 
tonight through Thursday...Pacific satellite loop displays a 
baroclinic Leaf cloud structure developing over western Washington 
this afternoon...indicative of a frontal couplet featuring a warm 
front running west to east over eastern Washington followed by a 
cold occluded front running southwest to northeast just off the 
Pacific coast. This frontal complex is being fueled by a deep and 
well directed fetch of sub-tropical moisture. The passage of this 
sopping wet frontal complex will drive the weather for the next 24 
to 36 hours. The entire forecast area is or soon will be in the 
thick of this wet storm...with surface observation already 
recording a general 1/2 to 1 inch of rain and High Mountain snow 
we over the Cascades in the last 12 hours...with even the 
normally dry deep basin locations receiving from a few hundredths 
to a tenth of and inch already this afternoon. The surface 
pressure gradient is producing a downslope southeast wind field 
over the Palouse and points south which is retarding the onset of 
precipitation. 


Two regimes or rounds will occur over the next 24 hours. The 
first round will occur this evening over the west and through 
tonight over the east and will be characterized by steady light 
to moderate stratiform rain enhancing isentropically over the slow 
moving or nearly stationary warm front. Low level upslope flow 
into the Cascades will assure continued precipitation even over 
the normally dry deep basin. Snow levels will remain around 6000 
feet in this warm advective scenario. The currently dry Palouse 
and lc valley will succumb to the rain later tonight as the fetch 
becomes better directed and in particular as the robust lift 
along the occlusion moves through towards dawn. 


The arrival of the occluded front will mark the beginning of the 
second round. Passing trough the Cascades around midnight and into 
the Idaho Panhandle around dawn this front will bring an area of 
dense and occasionally heavy showers just ahead of it...followed 
by a quick shut off of significant precipitation but a quick 
increase in winds especially over the exposed terrain of the 
Basin. A moist orographic regime will dominate with the usual rain 
shadow off the Cascades and continued orographic showers feeding 
into the northeast Washington and Idaho Panhandle mountains. 


Winds on Thursday look to be solidly breezy with gust potential up 
to 30-35 mph or so on exposed terrain but the models are similar 
in depicting a gradient that will not justify any wind highlights 
at this time. These winds will help keep temperatures on the warm 
side of normal in a well mixed and adiabatically dominated surface 
layer. 


Hydrology issues...rainfall totals from this storm will range 
from over 2 inches near the Cascade crest to 1 to 2 inches in the 
mountains north and east of the basin. Lowland locations will 
range from 1/4 to 1/2 inch in the basin to near an inch or so in 
the valleys branching off the basin. River levels appear to be low 
enough to be able to handle this runoff with no trouble but 
smaller streams and tributaries draining the mountains will likely 
see significant rises but probably no small stream flooding. The 
wild card issue is how the recent burn scars in the Cascades will 
handle this soaking rain. Rain rates will not be sufficient to 
trigger classic flash floods but as the soil becomes saturated 
there is a possibility of denuded slopes becoming unstable and 
producing debris flows. These debris flows in gullies and stream 
beds could also produce debris dams in the channels and lead to a 
higher threat of dambreak flooding or "ice jam" type upstream 
flooding. There is a great deal of uncertainty and little 
experience/case history with these possibilities and these areas 
will need to be monitored closely over the next 24 hours. /Fugazzi 


Thursday night through friday: moist and unstable upslope flow 
will produce lingering showers across the Idaho Panhandle. These 
showers will be most numerous Thursday evening and taper off 
through Friday. All of the rain from the current weather system 
impacting the region will result in substantial boundary layer 
moisture. This will increase the threat for fog overnight Thursday 
into Friday morning as mid level clouds clear west to east across 
eastern Washington. Friday will be fairly benign with the region in 
between weather systems. High temperatures will be near to or 
slightly above normal in the 50s to low 60s. 


Friday night through Saturday night: a vigorous shortwave trough 
of lower pressure will pivot around the upper level low pressure 
system in the Gulf of Alaska on Friday. In addition, a moderate to 
strong jet streak will be draped across the state of Washington. A strong 
vorticity maximum at the base of the shortwave trough and favorable 
jet dynamics for large scale lift in the right entrance region of 
the jet streak will result in rapid surface cyclogenesis along 
130w off the coast of northern California and southern or. Models show 
good agreement with this surface low tracking northeast into 
northwest Washington on Saturday. The GFS is on the faster side of the 
medium range model guidance available, but good agreement overall. 


The warm front is progged to push north across the region Friday 
night. This will result in increased low level flow out of the 
east. The front itself does not appear to be particularly strong 
or moist. Easterly flow down the east slopes of the Idaho Panhandle 
mountains will result in some downward motions across these areas 
out into the eastern basin. This will counteract the lift along 
the warm front somewhat. Best chances for precip will likely be 
across the western portion of the forecast area, and more so in 
the east slopes of the northern Cascades where easterly flow will 
create some orographic enhancement. Temperatures will likely be 
fairly mild across the eastern portion of the forecast area 
behind the warm front on Saturday. 


Cold front passage with this system is expected Saturday night. 
This will result in increasing chances for precipitation from west 
to east along the front. Precipitation with this system is not 
expected to be much of a concern with light to moderate amounts 
anticipated. The greater concern with the front will be the 
winds. There is still quite a bit of uncertainty still at this 
time, but the surface low will be pushing inland across northwest Washington 
near its peak intensity. The 12z GFS and NAM model guidance has 
come in with an 850 mb jet of around 50-55 kt winds. There will be 
some decent cold air advection with the front, so I anticipate 
these winds will have a chance to mix down to the surface even 
though it will push across after sunset. These solutions are much 
stronger than previous runs, so confidence is still only moderate 
at this time. A wind highlight may be needed if these stronger 
solutions continue as the event approaches. /Svh 


Sunday through wednesday: models continue to depict an active 
pattern, with temperature held closer to seasonal averages; 
however agreement over the details decreases in the new work week. 


Sunday and Sunday night a surface low over southwest Canada 
tracks east. A trough trailing it sags across northeast Washington and 
north ID, weakening and pulling away by Monday morning. In tandem, 
the supporting upper trough migrates from the Pacific northwest to the 
northern High Plains, with the steering flow switching from 
southwest to west-northwest. Moisture and low-grade instability 
wrapped up in these features will continue providing shower chances 
across much of the inland northwest. Yet the best chances will be near 
the Cascade crest and the mountains of northeast Washington and id; the 
lowest chances will be in the Lee of the Cascades and l-c valley. 


From Sunday night into Monday the threat will retreat to just the 
mountain areas and if anything falls it looks light. There will 
be a stratus and patchy fog threat over the eastern Columbia Basin 
into the eastern mountain valleys in the night and morning hours 
too, given the lower level southwest flow and moisture provided 
from recent rains. 


From Monday night through Tuesday night the next system comes in, 
ostensibly with another modest moisture fetch which includes the 
remains former tropical system Ana. However there is wide 
variation amongst models over the precise track and timing of the 
system. Some runs bring a defined low toward the central British Columbia coast 
and others bring a smaller scale low toward the northern Oregon 
coast. The further south solutions offer higher precipitation 
amounts for the inland northwest and the further north solution shows 
more diffuse, lighter precipitation. These details will continue 
to be monitored and fine-tuned as we get more information. Right 
now look for thickening clouds on Monday night with the main rain 
chances increasing over the Cascades. The precipitation chances 
increase across the rest of the area going into Tuesday and 
Tuesday night as the system moves inland. By Wednesday models 
depict a shortwave ridge builds in, leading to a relative decrease 
in the precipitation threat and some stratus/patchy fog threat 
again over the eastern third of Washington and north ID, especially in the 
sheltered valleys. Rain chances will begin to increase from the 
west again late as that next system approaches. /J. Cote' 




&& 


Aviation... 
18z tafs: a very moist stream of Pacific moisture will enhance 
over a slow moving developing warm front draped west to east 
across the region today with gradually deteriorating conditions at 
all taf sites except kpuw and klws...where dry downslope winds 
will promote increasing clouds but generally dry conditions today. 
MVFR ceilings in rain will likely develop at keat and possibly kmwh 
during the day today. At the kgeg area taf sites mostly VFR 
showers are expected through 00z with steady stratiform rain and 
occasional MVFR ceilings developing after 00z. Tonight a trailing 
occluding front will sweep through the region with heavier rain 
along and immediately behind the front. A moist boundary layer 
even after the frontal passage will likely promote continued IFR stratus 
ceilings through 18z Thursday at the kgeg area taf sites and 
keat. /Mjf 




&& 


Preliminary point temps/pops... 
Spokane 48 59 43 57 44 63 / 100 50 50 10 20 20 
Coeur D'Alene 46 58 41 57 41 64 / 100 70 50 20 20 20 
Pullman 48 59 45 59 47 69 / 90 80 50 10 40 10 
Lewiston 53 63 48 64 46 72 / 40 60 50 20 40 10 
Colville 48 57 41 58 41 60 / 100 60 50 10 50 30 
Sandpoint 45 55 38 56 38 60 / 100 100 70 20 30 20 
Kellogg 46 54 41 53 42 62 / 90 80 80 30 20 10 
Moses Lake 50 64 43 61 45 63 / 90 20 10 10 40 20 
Wenatchee 49 61 44 57 47 58 / 100 30 10 10 60 40 
Omak 48 59 40 58 44 58 / 100 40 10 10 60 40 


&& 


Otx watches/warnings/advisories... 
Idaho...none. 
Washington...none. 
&& 


$$ 



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