Ontario, Oregon Weather Conditions

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Current Conditions

  • 61°
  • Clear
  • Wind: Calm
  • Humidity: 67%
  • Visibility: 10.0 miles
  • Dew Point: 50°
  • Pressure: 30.18 in. -

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Next 12 Hours

11  am
2  pm
5  pm
8  pm
11  pm
Partly Cloudy
Partly Cloudy
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Friday
  • Clear
  • High: 85 °
  • Low: 49 °
  • Clear
  • Saturday
  • Clear
  • High: 86 °
  • Low: 54 °
  • Clear
  • Sunday
  • Clear
  • High: 71 °
  • Low: 42 °
  • Clear
  • Monday
  • Clear
  • High: 77 °
  • Low: 45 °
  • Clear
  • Tuesday
  • Clear
  • High: 79 °
  • Low: 47 °
  • Clear

Forecast for Ontario, Oregon

Updated: 9:07 am MDT on October 9, 2015

  • Rest of Today

    Sunny. Highs 81 to 86. Southeast winds up to 10 mph.

  • Tonight

    Mostly clear. Lows 48 to 54. Light winds.

  • Saturday

    Sunny. Highs 81 to 86. South winds up to 10 mph.

  • Saturday Night

    Mostly clear. Lows 50 to 55. West winds 10 to 15 mph.

  • Sunday

    Partly cloudy. A 20 percent chance of rain in the morning. Cooler. Highs 70 to 75. West winds 10 to 15 mph.

  • Sunday Night through Tuesday Night

    Mostly clear. Lows 41 to 48. Highs 70 to 79.

  • Wednesday through Thursday

    Partly cloudy. Highs 71 to 77. Lows 43 to 49.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

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

Updated: 11:38 AM MDT

Temperature: 66.5 °F Dew Point: 53 °F Humidity: 61% Wind: Calm Pressure: 30.19 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

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

Updated: 11:37 AM MDT

Temperature: 67.7 °F Dew Point: 52 °F Humidity: 58% Wind: SSE at 2.0 mph Pressure: 30.10 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Annex, Ontario, OR

Updated: 11:35 AM MDT

Temperature: 67.5 °F Dew Point: 53 °F Humidity: 59% Wind: NE at 1.0 mph Pressure: 30.11 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: APRSWXNET, New Plymouth, ID

Updated: 11:17 AM MDT

Temperature: 61 °F Dew Point: 54 °F Humidity: 77% Wind: NE at 1 mph Pressure: 30.04 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Kinsell Drive, Weiser, ID

Updated: 11:37 AM MDT

Temperature: 68.2 °F Dew Point: 54 °F Humidity: 60% Wind: North at - Pressure: 27.71 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Owyhee Junction, Nyssa, OR

Updated: 11:35 AM MDT

Temperature: 64.5 °F Dew Point: 55 °F Humidity: 70% Wind: Calm Pressure: 30.05 in Hourly Precipitation: - Heat Index: - Graphs

Location: Monroe Creek Valley, Weiser, ID

Updated: 11:34 AM MDT

Temperature: 75.6 °F Dew Point: 47 °F Humidity: 36% Wind: SSE at 6.3 mph Pressure: 30.13 in Hourly Precipitation: - Heat Index: 78 °F Graphs

Location: Mann Creek, Weiser, ID

Updated: 11:24 AM MDT

Temperature: 73.2 °F Dew Point: 51 °F Humidity: 45% Wind: SE at 4.7 mph Pressure: 30.08 in Hourly Precipitation: - Heat Index: 77 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion

Area forecast discussion 
National Weather Service Boise Idaho 
956 am MDT Friday Oct 9 2015 

Discussion...a few more clouds than expected this morning with 
the high moving in from the south today. Looks like it will still 
clear in time to reach near record highs today. Winds will pick up 
this afternoon and strengthen Saturday as the warm temperatures 
allow vertical mixing of the stronger winds aloft. Updated this 
morning for cloud cover and winds...otherwise the forecast is on 


Aviation...VFR. Scattered to broken high level ceilings 
will dissipate this afternoon. Winds increase this afternoon with SW 
to southeast surface winds to 15 kts with locally higher gusts. SW winds 
aloft to 30 kts this afternoon. 

Weekend outlook...VFR through the weekend. A low pressure system 
will bring middle to low VFR ceilings and showers to east-central Oregon 
and the west-central Idaho mountains Saturday night into Sunday which could 
obscure higher terrain. Local Mountain Valley fog or low stratus would be 
possible Sunday morning as well. 


Previous discussion... 
short term...today through Saturday...upper level ridging will 
begin to decrease later today as a shallow but strong and fast- 
moving trough approaches the Pacific northwest coast. High level clouds 
continue to cover much of the region this morning...and these 
will be the deciding factor on high temperatures today. Guidance varies 
considerably throughout the short term...both highs and lows...due 
to differences in wind and sky cover. For today...forecast highs 
range from lower 80s in the ec MOS to upper 80s in the sref. 
Tomorrow the differences are even larger...from lower 80s in the 
met to near 90 in the mav. Differences today seem to be due to sky 
cover...while tomorrow they appear to be due to wind. With 
scattered to broken high clouds apparent upstream...went with a 
blend of guidance to allow for periods of sun and cloud. 
Tomorrow...the GFS seems to be too strong with the southeast wind in the 
Snake River Plain...and therefore has temperatures too high. The only way 
this will come to pass is if the upper level trough digs a little 
more than presently forecast and therefore slows down...allowing 
the surface trough to remain in southeast Oregon throughout the 
afternoon. However...with the nature of the wave...open instead of 
closed...and the fast flow in which it is embedded...will lean 
away from the warmest solution. In addition...the mav guidance 
results in record high temperatures over much of the area for Saturday 
maximum temperatures...and this pattern does not seem to support it. Finally... 
for overnight lows Friday night...the GFS again has significantly 
stronger southeast winds in the Snake River Plain...resulting in warm min 
temperatures. We again leaned away from the warm GFS/mav solution. 

Long term...Saturday night through Thursday...models agree on 
timing and amplitude of the shortwave trough crossing our County Warning Area late 
Saturday night and Sunday morning. Prefer the GFS which brings 
precipitation further south with this relatively deep and fast moving 
feature. Expect clearing Sunday afternoon following the cold 
front...with highs 10-15 degrees cooler than Saturday and close to 
normal. Low amplitude ridging will bring warming starting Monday... 
with dry westerly flow south of the jet axis. Temperatures will be 5- 
10 degrees above normal. 


Boi watches/warnings/advisories... 




previous short term...snow pellets 
previous long term....jt 

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