Ontario, Oregon Weather Conditions

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Current Conditions

  • 75°
  • Clear
  • Wind: WSW 4 mph
  • Humidity: 53%
  • Visibility: 10.0 miles
  • Dew Point: 57°
  • Pressure: 29.87 in. +

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Next 12 Hours

12  am
3  am
6  am
9  am
12  pm
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Mostly Cloudy
Mostly Cloudy
Partly Cloudy
Partly Cloudy
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Tuesday
  • Partly Cloudy
  • High: 98 °
  • Low: 68 °
  • Partly Cloudy
  • Wednesday
  • Partly Cloudy
  • High: 96 °
  • Low: 68 °
  • Partly Cloudy
  • Thursday
  • Partly Cloudy
  • High: 91 °
  • Low: 65 °
  • Partly Cloudy
  • Friday
  • Chance of a Thunderstorm
  • High: 89 °
  • Low: 65 °
  • Chance of T-Storms
  • Saturday
  • Chance of a Thunderstorm
  • High: 90 °
  • Low: 64 °
  • Chance of T-Storms

Forecast for Ontario, Oregon

Updated: 3:03 PM MDT on July 6, 2015

  • Tonight

    Partly cloudy. Lows 64 to 71. Northwest winds up to 10 mph.

  • Tuesday

    Mostly sunny. Highs 93 to 98. North winds up to 10 mph.

  • Tuesday Night

    Mostly clear. Lows 64 to 70. Northwest winds up to 10 mph.

  • Wednesday

    Sunny. Highs 88 to 95. Northwest winds up to 10 mph.

  • Wednesday Night

    Partly cloudy. Lows 64 to 69. Northeast winds up to 10 mph.

  • Thursday and Thursday Night

    Mostly cloudy. A chance of showers and a slight chance of thunderstorms. Chance of precipitation 30 percent. Highs 83 to 89. Lows 63 to 69.

  • Friday and Friday Night

    Mostly cloudy. A chance of showers and a slight chance of thunderstorms. Chance of precipitation 40 percent. Highs 82 to 87. Lows 63 to 68.

  • Saturday

    Partly cloudy. A chance of showers in the morning... then a slight chance of showers and thunderstorms in the afternoon. Chance of precipitation 30 percent. Highs 84 to 89.

  • Saturday Night through Sunday Night

    Partly cloudy with a 20 percent chance of showers and thunderstorms. Lows 61 to 70. Highs 84 to 91.

  • Monday

    Mostly sunny. Highs 88 to 94.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Payette Foothills, Payette, ID

Updated: 12:29 AM MDT

Temperature: 69.6 °F Dew Point: 32 °F Humidity: 17% Wind: Calm Pressure: 27.55 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

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

Updated: 12:33 AM MDT

Temperature: 70.0 °F Dew Point: 58 °F Humidity: 67% Wind: Calm Pressure: 29.76 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Annex, Ontario, OR

Updated: 12:40 AM MDT

Temperature: 71.8 °F Dew Point: 58 °F Humidity: 61% Wind: Calm Pressure: 29.79 in Hourly Precipitation: 0.00 in Heat Index: 76 °F Graphs

Location: APRSWXNET, New Plymouth, ID

Updated: 12:27 AM MDT

Temperature: 77 °F Dew Point: 54 °F Humidity: 45% Wind: Calm Pressure: 29.71 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

Location: Owyhee Junction, Nyssa, OR

Updated: 12:39 AM MDT

Temperature: 74.1 °F Dew Point: 56 °F Humidity: 53% Wind: WNW at 3.0 mph Pressure: 29.73 in Hourly Precipitation: - Heat Index: 77 °F Graphs

Location: Mann Creek, Weiser, ID

Updated: 12:29 AM MDT

Temperature: 69.3 °F Dew Point: 51 °F Humidity: 52% Wind: NNE at 4.2 mph Pressure: 29.85 in Hourly Precipitation: - Heat Index: - Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion

Area forecast discussion...corrected 
National Weather Service Boise Idaho 
836 PM MDT Monday Jul 6 2015 

Discussion...short-duration pulse thunderstorms developed this 
afternoon in Owyhee County...and this evening in the central Idaho 
mountains and Camas Prairie. Heavy rain was the main feature of 
these storms but one storm near Mountain Home AFB may have had hail 
as well. As of 8 PM PDT only a couple storms remained in northern 
Gooding co/ID...moving toward the southeast. All storms should die out by 
sunset. Less activity expected Tuesday afternoon but should 
increase from the southwest Wednesday and Thursday as a Pacific 
upper low comes inland via calif. Current forecast looks good...no 


Aviation...VFR. Isolated evening thunderstorms mainly north and 
east of kboi and along the Idaho-Nevada border. Isolated 
thunderstorms redeveloping Tuesday afternoon over southeast 
Oregon...the central Idaho mountains...and south of the Snake River 
Valley. Surface winds...southwest to northwest 5-10 kts becoming 
variable less than 10 kts after 04z. Winds aloft...northwest 10-15 
kts up through 10k feet mean sea level. 


Previous discussion... 
short term...tonight through Wednesday...thunderstorms have 
initiated over the higher terrain...primarily over central Owyhee 
County. The thunderstorms have shown little movement with radar 
depicting heavy rain. The favorable locations for thunderstorms 
through this evening include Owyhee County and the central Idaho 
mountains. The air mass is drier and more stable in the Treasure 
Valley North to Baker City and McCall where convection will be 
isolated. Activity will diminish after sunset. There is a reduced 
chance for convection on Tuesday as a slightly drier stable air 
mass spreads into most of the forecast area. Still looking for a 
slight chance of afternoon-evening showers and thunderstorms over 
the higher terrain of southeast Oregon and SW Idaho. An upper low off 
the California coast will move inland on Wednesday. Moisture will 
increase ahead of it and spread into our area...leading to a 
chance of afternoon showers and thunderstorms near the Nevada 
border and over the central Idaho mountains. Conditions are 
expected to remain dry for most of the Treasure valley. The 
primary concern with any thunderstorms will be heavy rainfall as 
the storm motion remains slow through Wednesday. Temperatures will 
be slightly higher on Tuesday then lower on Wednesday...especially 
near the Nevada border where there will be more clouds. 

Long term...Wednesday night through Monday...a very wet end of 
the week with an upper level trough off the California coast 
moving across the intermountain west Thursday through Saturday. 
The trough shifts inland over the Great Basin on Thursday and 
weakens as it moves northeastward over the forecast area on 
Friday. There will be plenty of monsoonal moisture and enough 
dynamics for showers and thunderstorms across the entire forecast 
area Thursday and Friday. The upper trough will be followed by a 
short wave embedded in the southwesterly flow for continued showers 
and thunderstorms across the forecast area. Southwesterly flow 
remains across the west as a deepening trough develops off the 
West Coast by Monday. This should keep at least a slight chance 
for showers and thunderstorms across southeast Oregon ahead of the 
slowly approaching upper level trough. Models have been 
inconsistent bringing the upper trough into the Pacific northwest... 
though the latest European model (ecmwf) and GFS suggest the trough will be near southeast 
Oregon Monday night. Low confidence with this so have kept 
temperatures Sunday and Monday near normal. Temperatures will cool 
to about 5 degrees below normal by Friday with cloudy and wet 


Boi watches/warnings/advisories... 




previous short term...bw 
previous long term....js/wh 

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