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

Hazardous Weather Conditions

Current conditions at

San Bernardino Intl. Airport (KSBD)

Lat: 34.09027°NLon: 117.24705°WElev: 1086.0ft.

Clear

99°F

37°C

Humidity 11%
Wind Speed W 6 MPH
Barometer 29.96 in (1014.56 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Heat Index94°F (34°C)
Last update 18 Aug 12:52 PM PDT
Extended Forecast for

Grand Terrace CA

Heat Advisory August 19, 10:00am until August 20, 08:00pm
Click here for hazard details and duration
Heat Advisory

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 100. West wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 100 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 70. West wind 5 to 10 mph becoming light and variable after midnight.

    Low: 70 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 102. Light southwest wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 102 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 71. Southwest wind 5 to 10 mph becoming light and variable after midnight.

    Low: 71 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 102. Light south wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 102 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 71.

    Low: 71 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 101.

    High: 101 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 71.

    Low: 71 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 98.

    High: 98 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 100. West wind 5 to 10 mph, with gusts as high as 20 mph.
Tonight
Mostly clear, with a low around 70. West wind 5 to 10 mph becoming light and variable after midnight.
Wednesday
Sunny, with a high near 102. Light southwest wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 71. Southwest wind 5 to 10 mph becoming light and variable after midnight.
Thursday
Sunny, with a high near 102. Light south wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Thursday Night
Partly cloudy, with a low around 71.
Friday
Mostly sunny, with a high near 101.
Friday Night
Mostly clear, with a low around 71.
Saturday
Sunny, with a high near 98.
Saturday Night
Mostly clear, with a low around 70.
Sunday
Sunny, with a high near 98.
Sunday Night
Mostly clear, with a low around 70.
Monday
Sunny, with a high near 98.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grand Terrace CA
 34.03°N 117.3°W (Elev. 1122 ft)
Last Update:
11:45 am PDT Aug 18, 2026
Forecast Valid:
1pm PDT Aug 18, 2026-6pm PDT Aug 24, 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