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

Fontana-Arrow Highway (CQ057)

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

NA

85°F

29°C

Humidity 18%
Wind Speed SSW 5 MPH
Barometer NA
Dewpoint 38°F (3°C)
Visibility NA
Heat Index82°F (28°C)
Last update 01 Sep 01:00 PM PDT
Extended Forecast for

Rialto CA

  • This Afternoon

    This Afternoon: Sunny, with a high near 88. Southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 88 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 62. Southwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.

    Low: 62 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 87. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 87 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 62. Southwest wind 5 to 10 mph becoming southeast after midnight.

    Low: 62 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 86. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.

    High: 86 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 61.

    Low: 61 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 63.

    Low: 63 °F

    Mostly Clear

  • Saturday

    Saturday: A chance of showers, mainly after 11am. Mostly sunny, with a high near 89.

    High: 89 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Sunny, with a high near 88. Southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Tonight
Clear, with a low around 62. Southwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.
Wednesday
Sunny, with a high near 87. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 62. Southwest wind 5 to 10 mph becoming southeast after midnight.
Thursday
Sunny, with a high near 86. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Thursday Night
Clear, with a low around 61.
Friday
Sunny, with a high near 87.
Friday Night
Mostly clear, with a low around 63.
Saturday
A chance of showers, mainly after 11am. Mostly sunny, with a high near 89.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 68.
Sunday
A chance of showers. Partly sunny, with a high near 90.
Sunday Night
A chance of showers. Partly cloudy, with a low around 69.
Labor Day
A chance of showers. Mostly sunny, with a high near 90.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Rialto CA
 34.1°N 117.4°W (Elev. 1289 ft)
Last Update:
11:24 am PDT Sep 1, 2026
Forecast Valid:
2pm PDT Sep 1, 2026-6pm PDT Sep 7, 2026
 
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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