National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Areas of Excessive Rainfall and Extreme Heat; Monitoring Tropical Storm Erin

Heavy to excessive rainfall over the southern Appalachians may bring areas of flooding Tuesday. Hot to extremely hot temperatures are in place through Tuesday across much of the western U.S. and northern New England. Tropical Storm Erin is forecast to become a Major Hurricane by this weekend as it moves across the central Atlantic Ocean. Monitor future forecasts for any East Coast impacts. Read More >

Hazardous Weather Conditions

Current conditions at

Ontario Municipal Airport (KONO)

Lat: 44.01424°NLon: 117.00808°WElev: 2185.0ft.

Clear

66°F

19°C

Humidity 63%
Wind Speed S 3 MPH
Barometer 29.96 in (1014.56 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 12 Aug 02:05 AM MDT
Extended Forecast for

3 Miles S Nyssa OR

Heat Advisory August 12, 12:00pm until August 12, 09:00pm
Click here for hazard details and duration
Heat Advisory

  • Overnight

    Overnight: Mostly clear, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 100. Calm wind becoming north around 5 mph in the afternoon.

    High: 100 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 67. Northwest wind around 6 mph becoming calm in the evening.

    Low: 67 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 99. Light west northwest wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 99 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 63. Northwest wind 6 to 13 mph.

    Low: 63 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 92.

    High: 92 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 89.

    High: 89 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 64. Calm wind.
Tuesday
Sunny and hot, with a high near 100. Calm wind becoming north around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 67. Northwest wind around 6 mph becoming calm in the evening.
Wednesday
Sunny and hot, with a high near 99. Light west northwest wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 63. Northwest wind 6 to 13 mph.
Thursday
Sunny and hot, with a high near 92.
Thursday Night
Mostly clear, with a low around 61.
Friday
Sunny, with a high near 89.
Friday Night
Mostly clear, with a low around 61.
Saturday
Sunny and hot, with a high near 90.
Saturday Night
Partly cloudy, with a low around 63.
Sunday
Mostly sunny and hot, with a high near 91.
Sunday Night
Partly cloudy, with a low around 62.
Monday
Sunny and hot, with a high near 92.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles S Nyssa OR
 43.83°N 116.99°W (Elev. 2211 ft)
Last Update:
3:04 pm MDT Aug 11, 2025
Forecast Valid:
2am MDT Aug 12, 2025-6pm MDT Aug 18, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation