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

Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Hazardous Weather Conditions

Current conditions at

Ontario Municipal Airport (KONO)

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

Partly Cloudy

75°F

24°C

Humidity 50%
Wind Speed SSW 4 MPH
Barometer 30.03 in (1016.93 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 17 Aug 12:20 PM MDT
Extended Forecast for

Ontario OR

Flash Flood Watch August 17, 03:00pm until August 18, 12:00am
Click here for hazard details and duration
Flash Flood Watch

  • This Afternoon

    This Afternoon: Sunny and hot, with a high near 90. Calm wind.

    High: 90 °F

    Hot

  • Tonight

    Tonight: Isolated showers and thunderstorms before midnight. Mostly cloudy, then becoming mostly clear toward daybreak, with a low around 64. Light south southeast wind. Chance of precipitation is 20%.

    Low: 64 °F

    Isolated
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Sunny and hot, with a high near 95. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 95 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 64. Calm wind becoming west northwest 5 to 7 mph after midnight.

    Low: 64 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 98. West southwest wind 3 to 5 mph.

    High: 98 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 96.

    High: 96 °F

    Hot

  • Wednesday Night

    Wednesday Night: Clear, with a low around 63.

    Low: 63 °F

    Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 95.

    High: 95 °F

    Hot

Detailed Forecast

This Afternoon
Sunny and hot, with a high near 90. Calm wind.
Tonight
Isolated showers and thunderstorms before midnight. Mostly cloudy, then becoming mostly clear toward daybreak, with a low around 64. Light south southeast wind. Chance of precipitation is 20%.
Monday
Sunny and hot, with a high near 95. Calm wind becoming southwest around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 64. Calm wind becoming west northwest 5 to 7 mph after midnight.
Tuesday
Sunny and hot, with a high near 98. West southwest wind 3 to 5 mph.
Tuesday Night
Mostly clear, with a low around 66.
Wednesday
Sunny and hot, with a high near 96.
Wednesday Night
Clear, with a low around 63.
Thursday
Sunny and hot, with a high near 95.
Thursday Night
Mostly clear, with a low around 62.
Friday
Sunny and hot, with a high near 99.
Friday Night
Mostly clear, with a low around 64.
Saturday
Sunny and hot, with a high near 99.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Ontario OR
 44.01°N 116.97°W (Elev. 2113 ft)
Last Update:
8:04 am MDT Aug 17, 2025
Forecast Valid:
12pm MDT Aug 17, 2025-6pm MDT Aug 23, 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