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

78°F

26°C

Humidity 62%
Wind Speed SW 1 MPH
Barometer NA
Dewpoint 64°F (18°C)
Visibility NA
Heat Index80°F (27°C)
Last update 29 Aug 05:00 AM PDT
Extended Forecast for

3 Miles ENE Rancho Cucamonga CA

Extreme Heat Warning August 29, 06:31am until August 29, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 29, 06:31am until August 29, 08:00pm

    NOW until 8:00pm Sat

    Extreme Heat Warning

  • Today

    High: 98 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 70. Southwest wind 5 to 10 mph becoming light and variable in the evening. Winds could gust as high as 20 mph.

    Low: 70 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 94. Light and variable wind becoming southwest 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.

    High: 94 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 65. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 65 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 90. Light south wind becoming southwest 10 to 15 mph in the morning. Winds could gust as high as 20 mph.

    High: 90 °F

    Sunny

  • Monday Night

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

    Low: 63 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers after 11pm. Partly cloudy, with a low around 64.

    Low: 64 °F

    Slight Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 98. Light and variable wind becoming southwest 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.
Tonight
Clear, with a low around 70. Southwest wind 5 to 10 mph becoming light and variable in the evening. Winds could gust as high as 20 mph.
Sunday
Sunny, with a high near 94. Light and variable wind becoming southwest 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.
Sunday Night
Clear, with a low around 65. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Monday
Sunny, with a high near 90. Light south wind becoming southwest 10 to 15 mph in the morning. Winds could gust as high as 20 mph.
Monday Night
Mostly clear, with a low around 63.
Tuesday
Mostly sunny, with a high near 89.
Tuesday Night
A slight chance of showers after 11pm. Partly cloudy, with a low around 64.
Wednesday
A slight chance of showers. Mostly sunny, with a high near 88.
Wednesday Night
Partly cloudy, with a low around 67.
Thursday
Mostly sunny, with a high near 91.
Thursday Night
Mostly clear, with a low around 68.
Friday
Sunny, with a high near 94.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ENE Rancho Cucamonga CA
 34.13°N 117.52°W (Elev. 1450 ft)
Last Update:
12:13 am PDT Aug 29, 2026
Forecast Valid:
6am PDT Aug 29, 2026-6pm PDT Sep 4, 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