Heat Persists in the South Central U.S. and California; Heavy Rain in the Ohio Valley

Sweltering heat remains across the South-Central Plains and Lower/Middle Mississippi Valley, as well as in the Southwest and California this week with limited nighttime relief. Heavy rainfall will lead to localized areas of flash flooding in parts of the Ohio Valley/Central Appalachians. Dry and breezy conditions will enhance fire weather concerns across the northern Rockies and High Plains. Read More >

Current conditions at

Ontario Municipal Airport (KONO)

Lat: 44.01424° N Lon: 117.00808° W Elev: 2185.0 ft.

Clear

84°F

29°C

Humidity 23%
Wind Speed ESE 5 MPH
Barometer 30.2 in (1022.69 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 09 Sep 06:00 PM MDT
Detailed forecast for

Oregon Lower Treasure Valley

Tonight
Clear. Lows 46 to 53. Light winds.
Thursday
Sunny. Highs 85 to 90. Light winds in the morning, becoming south up to 10 mph with gusts to 20 mph in the afternoon.
Thursday Night
Increasing clouds. Lows 51 to 57. Northwest winds 10 to 15 mph with gusts to 25 mph.
Friday
Sunny. Highs 78 to 83. Northwest winds 10 to 15 mph in the morning, becoming light in the afternoon.
Friday Night
Mostly clear. Lows 47 to 54. Light winds in the evening, becoming northwest 10 to 15 mph after midnight.
Saturday
Partly cloudy. A chance of showers in the afternoon. Chance of rain 30 percent. Highs 74 to 79.
Saturday Night
A slight chance of thunderstorms in the evening. Showers likely. Chance of rain 60 percent. Lows 46 to 51. Breezy.
Sunday
Partly cloudy with a 40 percent chance of showers. Cooler with highs 63 to 68. Breezy.
Sunday Night
Partly cloudy in the evening, then clearing. Patchy fog in the evening. Areas of fog after midnight. Lows 41 to 47.
Monday Through Tuesday
Areas of fog in the morning. Areas of fog. Mostly clear. Highs 64 to 73. Lows 42 to 48.
Tuesday Night And Wednesday
Partly cloudy. Lows 45 to 51. Highs 70 to 75.



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230 PM MDT Wed Sep 9 2026
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database