Current conditions at

Fontana-Arrow Highway (CQ057)

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

NA

78°F

26°C

Humidity 55%
Wind Speed WSW 8 MPH
Barometer NA
Dewpoint 61°F (16°C)
Visibility NA
Heat Index79°F (26°C)
Last update 12 Aug 08:00 PM PDT
Extended Forecast for

3 Miles S Rialto CA

  • Tonight

    Tonight: Mostly cloudy, with a low around 65. Southwest wind around 5 mph.

    Low: 65 °F

    Mostly Cloudy

  • Thursday

    Thursday: Patchy dense fog before 11am.  Otherwise, mostly cloudy, with a high near 87. Light southwest wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 87 °F

    Patchy Dense
    Fog then
    Mostly Cloudy

  • Thursday Night

    Thursday Night: Cloudy, with a low around 63. West wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 63 °F

    Cloudy

  • Friday

    Friday: Patchy fog before 11am.  Otherwise, cloudy through mid morning, then gradual clearing, with a high near 87. Light southwest wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 87 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: Clear, with a low around 63. Southwest wind 5 to 10 mph becoming light west  after midnight. Winds could gust as high as 20 mph.

    Low: 63 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 92.

    High: 92 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 65. Southwest wind around 5 mph.
Thursday
Patchy dense fog before 11am. Otherwise, mostly cloudy, with a high near 87. Light southwest wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Thursday Night
Cloudy, with a low around 63. West wind 5 to 10 mph, with gusts as high as 20 mph.
Friday
Patchy fog before 11am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 87. Light southwest wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Friday Night
Clear, with a low around 63. Southwest wind 5 to 10 mph becoming light west after midnight. Winds could gust as high as 20 mph.
Saturday
Sunny, with a high near 90.
Saturday Night
Mostly clear, with a low around 64.
Sunday
Sunny, with a high near 92.
Sunday Night
Mostly clear, with a low around 65.
Monday
Mostly sunny, with a high near 93.
Monday Night
Mostly clear, with a low around 67.
Tuesday
Sunny, with a high near 94.
Tuesday Night
Mostly clear, with a low around 67.
Wednesday
Sunny, with a high near 94.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles S Rialto CA
 34.08°N 117.4°W (Elev. 1125 ft)
12:36 pm PDT Aug 12, 2026
9pm PDT Aug 12, 2026-6pm PDT Aug 19, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database