Ontario, Oregon Weather Conditions

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Current Conditions

  • 66°
  • Clear
  • Wind: NNW 15 mph
  • Humidity: 33%
  • Visibility: 10.0 miles
  • Dew Point: 36°
  • Pressure: 29.84 in. +

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Next 12 Hours

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

5 Day Forecast

  • Friday
  • Chance of Rain
  • High: 67 °
  • Low: 45 °
  • Chance of Rain
  • Saturday
  • Partly Cloudy
  • High: 73 °
  • Low: 46 °
  • Partly Cloudy
  • Sunday
  • Clear
  • High: 74 °
  • Low: 45 °
  • Clear
  • Monday
  • Clear
  • High: 77 °
  • Low: 48 °
  • Clear
  • Tuesday
  • Clear
  • High: 83 °
  • Low: 52 °
  • Clear

Forecast for Ontario, Oregon

Updated: 2:54 PM MDT on April 28, 2016

  • Tonight

    Mostly clear. Lows 42 to 47. Northwest winds 10 to 15 mph with gusts to 25 mph in the evening...becoming light after midnight.

  • Friday

    Partly cloudy. A chance of rain showers and a slight chance of thunderstorms in the afternoon. Chance of precipitation 30 percent. Highs 61 to 66. Northwest winds around 10 mph.

  • Friday Night

    Mostly cloudy with a 40 percent chance of rain showers. Lows 42 to 47. Breezy. Northwest winds 10 to 20 mph.

  • Saturday

    Decreasing clouds. Highs 66 to 71. Northwest winds 10 to 15 mph.

  • Saturday Night

    Mostly clear. Lows 40 to 45. Northwest winds 10 to 15 mph. Gusts to 25 mph in the evening.

  • Sunday

    Sunny. Highs 68 to 73.

  • Sunday Night

    Partly cloudy. Lows 42 to 47.

  • Monday through Tuesday Night

    Mostly clear. Highs 72 to 81. Lows 41 to 51.

  • Wednesday

    Increasing clouds. Highs 77 to 82.

  • Wednesday Night

    Mostly cloudy. Lows 47 to 52.

  • Thursday

    Mostly cloudy with a 20 percent chance of showers and thunderstorms. Highs 73 to 78.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

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

Updated: 7:49 PM MDT

Temperature: 62.6 °F Dew Point: 39 °F Humidity: 41% Wind: North at 10.0 mph Pressure: 29.80 in Hourly Precipitation: 0.00 in Graphs

Location: Annex, Ontario, OR

Updated: 7:49 PM MDT

Temperature: 62.7 °F Dew Point: 38 °F Humidity: 40% Wind: WNW at 5.0 mph Pressure: 29.81 in Hourly Precipitation: 0.00 in Graphs

Location: APRSWXNET, New Plymouth, ID

Updated: 7:18 PM MDT

Temperature: 64 °F Dew Point: 39 °F Humidity: 40% Wind: NW at 8 mph Pressure: 29.72 in Hourly Precipitation: 0.00 in Graphs

Location: Kinsell Drive, Weiser, ID

Updated: 7:45 PM MDT

Temperature: 65.1 °F Dew Point: 38 °F Humidity: 37% Wind: North at - Pressure: 27.41 in Hourly Precipitation: 0.00 in Graphs

Location: Boise Valley Feeders, Parma, ID

Updated: 7:42 PM MDT

Temperature: 62.8 °F Dew Point: 38 °F Humidity: 40% Wind: ENE at 9.0 mph Pressure: 29.44 in Hourly Precipitation: 0.00 in Graphs

Location: Weiser flat, Weiser, ID

Updated: 7:46 PM MDT

Temperature: 62.4 °F Dew Point: 37 °F Humidity: 39% Wind: West at 11.4 mph Pressure: 29.82 in Hourly Precipitation: - Graphs

Location: Trail Ridge Subdivision, Parma, ID

Updated: 7:50 PM MDT

Temperature: 65.8 °F Dew Point: 37 °F Humidity: 35% Wind: WNW at 6.8 mph Pressure: 27.50 in Hourly Precipitation: - Graphs

Location: Monroe Creek Valley, Weiser, ID

Updated: 7:41 PM MDT

Temperature: 61.3 °F Dew Point: 37 °F Humidity: 41% Wind: North at 6.7 mph Pressure: 29.79 in Hourly Precipitation: - Graphs

Location: Mann Creek, Weiser, ID

Updated: 7:41 PM MDT

Temperature: 59.7 °F Dew Point: 40 °F Humidity: 48% Wind: NE at 8.3 mph Pressure: 29.72 in Hourly Precipitation: - Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion

Area forecast discussion 
National Weather Service Boise Idaho 
239 PM MDT Thursday Apr 28 2016 

Short term...tonight through Saturday...upper low in western 
Montana keeps some moisture and showers going in the central 
Idaho mountains overnight and early Friday. Breezing northwest winds 
should diminish along Oregon/Idaho border by late evening. Friday 
the attention shifts to trough approaching from the Pacific 
northwest...bringing a better chance for showers and thunderstorms 
across the forecast area...mainly in Oregon in the afternoon...but 
spreading into Idaho in the evening. Yet again...this trough 
splits off and moves to southern Nevada by Saturday morning...so 
showers will be mostly south of the area by Saturday morning. Some 
showers may continue to form in central Idaho mountains...and 
near Nevada border through the afternoon...especially over 
northeast facing slopes. Breezy winds again both Friday and 
Saturday afternoon...especially Saturday behind the stronger 
trough. Temperatures a little below normal on Friday...then back 
near normal on Saturday. 

Long term...Saturday night through Tuesday...base of an upper level 
trough will dig south to Arizona Saturday night as a ridge of high 
pressure builds into the Pacific northwest. Flow aloft will shift to 
the north over the forecast area Saturday night and Sunday for mostly 
dry conditions. Models are in better agreement with this system but 
there seems to be differences from run to run as to how far south 
the trough will dig. Depending on the position of the base of the 
trough there could be some wrap around moisture that could bring 
some precipitation to regions along the Nevada border. Will keep 
the probability of precipitation mostly on the dry side but will keep a slight chance along 
and near the Nevada border. Trough will weaken Sunday night and 
lift to the northeast on Monday. Models in good agreement on Monday 
with the system moving northeast...but differ on placement of 
precipitation. Thinking that any remaining precipitation with this 
system will stay south and east of the forecast area for mostly dry 
conditions...but will leave slight chance probability of precipitation along the southern 
and eastern borders of the forecast area. Mostly dry conditions 
Tuesday along with warming temperatures as the upper level trough 
over the region begins to move east as a long wave trough over the 
Pacific moves towards the West Coast. High temperatures on Sunday 
will be near normal and warm to around 10 degrees above normal by 

Tuesday night through Thursday...models are much more in alignment 
during this time period than previous runs. The breakdown of the 
ridge begins to show Wednesday as the low starts to push in and 
associated moisture starts to make its way into eastern Oregon. A 
steady increase in precipitation and possible afternoon 
thunderstorms can be expected as this low progresses to our 
south...mostly for higher elevations. Temperatures will remain above 
normal for this time period. 

Aviation...VFR. Scattered to broken middle level ceilings. Isolated 
showers and thunderstorms this evening. Surface winds southwest to 
northwest 10 knots or less after sunset. Winds aloft northwesterly 
10 knots or less up through 10k feet mean sea level. 

Weekend outlook...showers will spread over the region Friday 
afternoon and remain over the area through Saturday morning. Slight 
chance of thunderstorms Friday afternoon into Friday evening. 
Expect conditions will be VFR but could see local MVFR conditions in 
heavier showers. Snow levels will fall to around 6500 feet mean sea level by 
Saturday morning. Precipitation will decrease from west to east 
Saturday with mostly dry conditions Sunday. 

Boi watches/warnings/advisories... 




Short term...tb 
long term....ja/jc 

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