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

100°F

38°C

Humidity 27%
Wind Speed WSW 8 MPH
Barometer NA
Dewpoint 60°F (16°C)
Visibility NA
Heat Index101°F (38°C)
Last update 25 Aug 06:00 PM PDT
Extended Forecast for

3 Miles E Rancho Cucamonga CA

Extreme Heat Warning August 25, 07:08pm until August 28, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 25, 07:08pm until August 28, 08:00pm

    NOW until 8:00pm Fri

    Extreme Heat Warning

  • Tonight

    Low: 75 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 105. Light and variable wind becoming west 10 to 15 mph in the morning. Winds could gust as high as 25 mph.

    High: 105 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 76. Southwest wind 5 to 10 mph becoming light and variable in the evening.

    Low: 76 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 106. Light and variable wind becoming southwest 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 around 5 mph becoming calm in the evening.

    Low: 76 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 105.

    High: 105 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 75.

    Low: 75 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 101.

    High: 101 °F

    Sunny

Detailed Forecast

Tonight
Mostly clear, with a low around 75. Southwest wind 5 to 10 mph becoming light and variable in the evening.
Wednesday
Sunny, with a high near 105. Light and variable wind becoming west 10 to 15 mph in the morning. Winds could gust as high as 25 mph.
Wednesday Night
Partly cloudy, with a low around 76. Southwest wind 5 to 10 mph becoming light and variable in the evening.
Thursday
Partly sunny, with a high near 106. Light and variable wind becoming southwest 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 around 5 mph becoming calm in the evening.
Friday
Mostly sunny, with a high near 105.
Friday Night
Partly cloudy, with a low around 75.
Saturday
Sunny, with a high near 101.
Saturday Night
Mostly clear, with a low around 72.
Sunday
Sunny, with a high near 97.
Sunday Night
Mostly clear, with a low around 68.
Monday
Sunny, with a high near 93.
Monday Night
Mostly clear, with a low around 67.
Tuesday
A slight chance of showers. Sunny, with a high near 92.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles E Rancho Cucamonga CA
 34.11°N 117.51°W (Elev. 1198 ft)
Last Update:
5:10 pm PDT Aug 25, 2026
Forecast Valid:
7pm PDT Aug 25, 2026-6pm PDT Sep 1, 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