Ontario, Oregon Weather Conditions

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Current Conditions

  • 33°
  • Overcast
  • Wind: North 4 mph
  • Humidity: 89%
  • Visibility: 5.0 miles
  • Dew Point: 30°
  • Pressure: 30.60 in. -
  • Heat Index: 30

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Next 12 Hours

5  pm
8  pm
11  pm
2  am
5  am
Overcast
Overcast
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
34°
35°
33°
33°
32°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Friday
  • Overcast
  • High: 33 °
  • Low: 29 °
  • Overcast
  • Saturday
  • Overcast
  • High: 44 °
  • Low: 22 °
  • Overcast
  • Sunday
  • Mostly Cloudy
  • High: 42 °
  • Low: 24 °
  • Mostly Cloudy
  • Monday
  • Partly Cloudy
  • High: 41 °
  • Low: 23 °
  • Partly Cloudy
  • Tuesday
  • Mostly Cloudy
  • High: 41 °
  • Low: 24 °
  • Mostly Cloudy

Forecast for Ontario, Oregon

Updated: 3:01 PM MST on February 5, 2016

  • Tonight

    Mostly cloudy. Patchy fog through the night. A 20 percent chance of rain showers after midnight. Lows 28 to 33. Light winds.

  • Saturday

    Partly sunny. Patchy fog in the morning. Highs 36 to 42. Light winds.

  • Saturday Night

    Mostly cloudy. Patchy fog. Lows 26 to 31. Light winds.

  • Sunday

    Cloudy. Patchy fog in the morning. Highs 32 to 37. Light winds.

  • Sunday Night

    Mostly cloudy. Patchy fog in the evening. Areas of fog after midnight. Lows 24 to 29. Light winds.

  • Monday and Monday Night

    Mostly cloudy. Areas of fog. Highs 32 to 38. Lows 24 to 29.

  • Tuesday

    Mostly cloudy. Highs 31 to 37.

  • Tuesday Night

    Mostly cloudy. Areas of fog. Lows 27 to 32.

  • Wednesday

    Partly sunny. Highs 31 to 37.

  • Wednesday Night

    Mostly cloudy. Patchy fog. Lows 29 to 34.

  • Thursday

    Mostly sunny. Highs 33 to 43.

  • Thursday Night

    Mostly cloudy. Lows 29 to 34.

  • Friday

    Mostly cloudy with a 20 percent chance of rain showers. Highs 46 to 51.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: NE 25th/Payette Heights Rd., Payette, ID

Updated: 4:54 PM MST

Temperature: 32.2 °F Dew Point: 31 °F Humidity: 95% Wind: North at 1.0 mph Pressure: 30.68 in Hourly Precipitation: 0.00 in Windchill: 32 °F Graphs

Location: Sunnyside Dairy (2mi S of Weiser), Weiser, ID

Updated: 4:54 PM MST

Temperature: 32.1 °F Dew Point: 32 °F Humidity: 99% Wind: WSW at 3.0 mph Pressure: 30.60 in Hourly Precipitation: 0.00 in Windchill: 32 °F Graphs

Location: Annex, Ontario, OR

Updated: 4:55 PM MST

Temperature: 32.3 °F Dew Point: 31 °F Humidity: 95% Wind: Calm Pressure: 30.61 in Hourly Precipitation: 0.00 in Windchill: 32 °F Graphs

Location: APRSWXNET, New Plymouth, ID

Updated: 4:34 PM MST

Temperature: 34 °F Dew Point: 33 °F Humidity: 97% Wind: Calm Pressure: 30.51 in Hourly Precipitation: 0.00 in Windchill: 34 °F Graphs

Location: Boise Valley Feeders, Parma, ID

Updated: 4:53 PM MST

Temperature: 32.6 °F Dew Point: 32 °F Humidity: 98% Wind: Calm Pressure: 30.20 in Hourly Precipitation: 0.00 in Windchill: 33 °F Graphs

Location: Indianhead Rd between Hale and Jenkins Creek Rds, Weiser, ID

Updated: 3:20 PM MST

Temperature: 33.6 °F Dew Point: 31 °F Humidity: 89% Wind: SW at 2.2 mph Pressure: 30.39 in Hourly Precipitation: - Windchill: 34 °F Graphs

Location: Trail Ridge Subdivision, Parma, ID

Updated: 4:54 PM MST

Temperature: 33.4 °F Dew Point: 32 °F Humidity: 94% Wind: NE at 2.2 mph Pressure: 28.10 in Hourly Precipitation: - Windchill: 33 °F Graphs

Location: Owyhee Junction, Nyssa, OR

Updated: 4:41 PM MST

Temperature: 32.5 °F Dew Point: 31 °F Humidity: 95% Wind: West at 2.0 mph Pressure: 30.56 in Hourly Precipitation: - Windchill: 32 °F Graphs

Location: Monroe Creek Valley, Weiser, ID

Updated: 4:50 PM MST

Temperature: 33.6 °F Dew Point: 29 °F Humidity: 84% Wind: NW at 1.1 mph Pressure: 30.42 in Hourly Precipitation: - Windchill: 34 °F Graphs

Location: Mann Creek, Weiser, ID

Updated: 4:54 PM MST

Temperature: 33.8 °F Dew Point: 31 °F Humidity: 89% Wind: NNE at 1.7 mph Pressure: 30.38 in Hourly Precipitation: - Windchill: 34 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion 
National Weather Service Boise Idaho 
254 PM MST Friday Feb 5 2016 


Short term...tonight through Sunday...a vigorous upper level 
trough is approaching the Pacific northwest this afternoon...and this feature 
will swing through northern Idaho tonight...providing a glancing blow 
to our forecast area. Snow and rain showers will pass over mainly 
the northern third of the County Warning Area starting this evening in Baker County and 
continuing overnight mainly in the west-central and Boise 
Mountains. In response to this system...winds will increase 
moderately over most of the area...limiting fog formation through 
much of the night. However...the fog that is ongoing in the lower 
Treasure valley will remain...at least with patchy coverage... 
through much of the night. Patchy fog is forecast over a larger 
area beginning around 5 am for mainly the lower Treasure valley 
and continuing through most of tomorrow morning. Temperatures Sat will 
depend largely on how much fog forms and over how large an area. 
At this time it appears on the small side for Saturday...mainly 
confined to the lower Treasure valley...but this area will expand 
Saturday night into Sunday as an inversion takes hold. As higher 
elevations warm late Sunday...lower elevations will struggle. We 
have gone substantially below computer model guidance in the lower 
and much of the upper Treasure valleys. Mountain valleys will 
experience the same thing. We expect low clouds and/or fog to 
extend over much of the western magic and Treasure valleys 
Saturday night through Sunday. As the ridge builds in...we will be 
dry Sat through sun. 


Long term...Sunday night through Wednesday...high amplitude upper 
level ridge will be over the region through at least the middle of 
the week. Strong valley inversions will develop under this ridge 
along with patchy fog and stratus. Confidence is high that valley 
inversions will develop but confidence remains low on the overall 
extent of the stratus and fog under the inversion. Temperatures 
will be tricky due to uncertainty of how much fog and stratus will 
form under the inversion...but will continue the trend of high 
temperatures in the valleys in the 30s with temperatures above the 
inversion in the 40s and low 50s. 


Wednesday night through Friday...models continue to differ on timing 
of the next system. European model (ecmwf) wants to bring moisture through starting 
Thursday am while the GFS doesn't bring anything into the County Warning Area until 
Friday PM. With this being said...confidence is low for the timing 
of any precipitation for the County Warning Area. Snow levels do look to remain high 
enough that if and when the precipitation hits it will be in the 
form of rain except for higher elevations above 5000 feet. The 
inversion appears to break down by Thursday morning so expect 
temperatures to begin to increase in the lower valleys again 
through the daytime hours. 


&& 


Aviation...low stratus and valley fog has decreased through the 
afternoon but still remains at kjer and in the lower Treasure valley 
from keul-kono. Thinking this fog and stratus will continue to 
decrease into this evening...but will redevelop and spread again 
after sunset. Not expecting fog at kboi until 12z...but can not rule 
out fog developing before 12z. No fog at ktwf...but an MVFR stratus 
deck could move in after 06z. Surface winds generally 10 knots or 
less. Winds aloft northwesterly 10-20 knots up through 10k feet mean sea level. 


Weekend outlook...scattered showers will spread across Baker County 
and the west central mountains tonight...then decrease from west to 
east on Saturday. Upper level ridge will develop over the area late 
Saturday night into Sunday with low stratus and valley fog forming 
Sunday morning. 


&& 


Air stagnation...we continue to expect a strong ridge aloft to 
bring about inversion conditions beginning Sunday and lasting well 
into next week. Air quality may be impacted...and fog and/or low 
clouds is expected to form in valleys. 


&& 


Boi watches/warnings/advisories... 
Idaho...none. 
Or...none. 


&& 


$$ 


Weather.Gov/Boise 


Short term...snow pellets 
long term....ja/jc 
aviation.....Ja 
air stagnation...snow pellets 






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