Ontario, Oregon Weather Conditions

Your Weather

To update your location please enter your ZIP code, city, state, airport code or country in the field below. Weather by E-mail: Forecast storm alerts. Weather E-Mail Alert Sign Up »

Current Conditions

  • 54°
  • Clear
  • Wind: Variable 5 mph
  • Humidity: 45%
  • Visibility: 10.0 miles
  • Dew Point: 33°
  • Pressure: 29.86 in. -

Select a Section

Click a section below for more information.

Next 12 Hours

4  am
7  am
10  am
1  pm
4  pm
Partly Cloudy
Partly Cloudy
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Friday
  • Clear
  • High: 75 °
  • Low: 48 °
  • Clear
  • Saturday
  • Mostly Cloudy
  • High: 66 °
  • Low: 42 °
  • Mostly Cloudy
  • Sunday
  • Clear
  • High: 73 °
  • Low: 47 °
  • Clear
  • Monday
  • Clear
  • High: 76 °
  • Low: 47 °
  • Clear
  • Tuesday
  • Clear
  • High: 80 °
  • Low: 48 °
  • Clear

Forecast for Ontario, Oregon

Updated: 3:19 am MDT on September 4, 2015

  • Today

    Partly cloudy. Isolated showers in the afternoon. Chance of showers 20 percent. Highs 70 to 75. West winds 10 to 15 mph in the morning...shifting to north in the afternoon.

  • Tonight

    Mostly cloudy with a chance of showers and a slight chance of thunderstorms in the evening...then partly cloudy with a chance of showers after midnight. Chance of precipitation 30 percent. Lows 45 to 50. Breezy. Northwest winds 10 to 20 mph with gusts to 30 mph.

  • Saturday

    Partly cloudy with a chance of showers in the morning...then cloudy with a chance of showers and a slight chance of thunderstorms in the afternoon. Chance of precipitation 40 percent. Highs 62 to 67. West winds 10 to 15 mph.

  • Saturday Night

    Mostly cloudy with a 30 percent chance of showers in the evening...then mostly clear after midnight. Lows 42 to 47. West winds 10 to 15 mph in the evening...becoming light after midnight.

  • Sunday

    Sunny. Highs 69 to 74. West winds up to 10 mph.

  • Sunday Night

    Partly cloudy. Lows 45 to 51.

  • Labor Day through Tuesday Night

    Mostly clear. Highs 72 to 82. Lows 44 to 54.

  • Wednesday through Thursday

    Mostly clear. Highs 81 to 86. Lows 49 to 56.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

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

Updated: 4:19 AM MDT

Temperature: 42.5 °F Dew Point: 40 °F Humidity: 90% Wind: Calm Pressure: 29.90 in Hourly Precipitation: 0.00 in Windchill: 42 °F Graphs

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

Updated: 4:18 AM MDT

Temperature: 45.1 °F Dew Point: 41 °F Humidity: 84% Wind: NNE at 1.0 mph Pressure: 29.82 in Hourly Precipitation: 0.00 in Windchill: 45 °F Graphs

Location: Annex, Ontario, OR

Updated: 4:15 AM MDT

Temperature: 48.6 °F Dew Point: 42 °F Humidity: 77% Wind: Calm Pressure: 29.82 in Hourly Precipitation: 0.00 in Windchill: 49 °F Graphs

Location: APRSWXNET, New Plymouth, ID

Updated: 3:45 AM MDT

Temperature: 51 °F Dew Point: 38 °F Humidity: 61% Wind: Calm Pressure: 29.75 in Hourly Precipitation: 0.00 in Windchill: - Graphs

Location: Kinsell Drive, Weiser, ID

Updated: 4:18 AM MDT

Temperature: 54.1 °F Dew Point: 40 °F Humidity: 58% Wind: North at - Pressure: 27.43 in Hourly Precipitation: 0.00 in Windchill: - Graphs

Location: Weiser flat, Weiser, ID

Updated: 4:15 AM MDT

Temperature: 53.6 °F Dew Point: 40 °F Humidity: 59% Wind: NW at 4.2 mph Pressure: 29.85 in Hourly Precipitation: - Windchill: - Graphs

Location: Mann Creek, Weiser, ID

Updated: 4:08 AM MDT

Temperature: 46.8 °F Dew Point: 40 °F Humidity: 78% Wind: WNW at 2.7 mph Pressure: 29.76 in Hourly Precipitation: - Windchill: 47 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion

Area forecast discussion 
National Weather Service Boise Idaho 
313 am MDT Friday Sep 4 2015 

Short term...upper low along the Washington coast at 09z still moving 
south. Low should get to southwestern Oregon tonight then turn back toward 
the NE over our Oregon zones overnight...then to northern Idaho late 
Saturday. Showers will continue today in the central Idaho 
mountains while also increasing this afternoon in Oregon zones. Cold 
air aloft with the upper low will destabilize the air for a slight 
chance of thunderstorms this afternoon and evening. Cold air and 
showers...snow showers above about 7500 feet mean sea level in northern 
areas...will finally spread across Idaho zones tonight and Saturday 
with maximum temperatures Saturday as much as 20 degrees below normal...highs 
in the 50s in the mountains to only the middle 60s in the lower 
valleys. Even with highs that cold the air will again be unstable 
enough for a slight chance of thunderstorms Saturday afternoon. 
Light northwest winds today and tonight...light to moderate 
northwest winds Saturday. 

Long term...Saturday night through Thursday...upper level trough 
will move out of the area Saturday night with lingering showers over 
the west central Idaho mountains. Sunday northwesterly flow will 
develop over the Pacific northwest for dry conditions through the 
rest of the week. Temperatures will start out 10-14 degrees below 
normal with a slow warming trend through the week with temperatures 
back to near normal for Wednesday and Thursday. 


Aviation...VFR. This morning...widely scattered showers and middle 
level ceilings will continue in a thin band stretching roughly from 
kwmc-kmuo-ksnt. Clearing west of the band of precipitation will 
allow for local IFR conditions in patchy valley fog. This afternoon 
increasing clouds with showers spreading into southeast Oregon and 
the central mountains of Idaho this evening. Surface winds will be 
light this morning...becoming southwest to northwest 10-15 knots 
this afternoon. Winds aloft will be southwesterly around 30 knots 
up through 10k feet mean sea level. 

Weekend outlook...upper level trough will move into the Pacific 
northwest bringng showers to the region tonight through Saturday 
night. Low VFR and local MVFR ceilings with heavier showers can be 
expected. VFR conditions Sunday with clouds and precipitation 
decreasingfrom west to east. Gusty westerly winds surface and aloft 
Saturday...weakening on Sunday. 


Boi watches/warnings/advisories... 




Short term...lc 
long term....ja 

National Weather Service Glossary of Abbreviations

Non-Expanded Version (with abbreviations)

Powered by the Weather Underground, Inc.