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

Hazardous Weather Conditions

Current conditions at

Fontana-Arrow Highway (CQ057)

Lat: 34.10056°NLon: 117.49222°WElev: 1191.0ft.

NA

90°F

32°C

Humidity 40%
Wind Speed SSW 3 MPH
Barometer NA
Dewpoint 63°F (17°C)
Visibility NA
Heat Index91°F (33°C)
Last update 26 Aug 09:00 PM PDT
Extended Forecast for

4 Miles SSW Rialto CA

Extreme Heat Warning August 26, 10:51pm until August 28, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 26, 10:51pm until August 28, 08:00pm

    NOW until 8:00pm Fri

    Extreme Heat Warning

  • Tonight

    Low: 76 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 106. Light southwest wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 106 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 76. West wind 5 to 10 mph becoming light south in the evening.

    Low: 76 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 104. Light southwest wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 104 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 74. Southwest wind 5 to 10 mph becoming light west in the evening.

    Low: 74 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 102.

    High: 102 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 70.

    Low: 70 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

Detailed Forecast

Tonight
Partly cloudy, with a low around 76. Southwest wind around 5 mph becoming calm.
Thursday
Partly sunny, with a high near 106. Light southwest wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Thursday Night
Mostly cloudy, with a low around 76. West wind 5 to 10 mph becoming light south in the evening.
Friday
Mostly sunny, with a high near 104. Light southwest wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Friday Night
Mostly clear, with a low around 74. Southwest wind 5 to 10 mph becoming light west in the evening.
Saturday
Sunny, with a high near 102.
Saturday Night
Clear, with a low around 70.
Sunday
Sunny, with a high near 96.
Sunday Night
Mostly clear, with a low around 65.
Monday
Sunny, with a high near 92.
Monday Night
A slight chance of showers. Mostly clear, with a low around 64.
Tuesday
A slight chance of showers. Mostly sunny, with a high near 91.
Tuesday Night
A slight chance of showers. Partly cloudy, with a low around 67.
Wednesday
A slight chance of showers. Mostly sunny, with a high near 93.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW Rialto CA
 34.06°N 117.39°W (Elev. 1056 ft)
Last Update:
11:36 am PDT Aug 26, 2026
Forecast Valid:
10pm PDT Aug 26, 2026-6pm PDT Sep 2, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation