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Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Current conditions at

Mount Diablo Summit Museum and Trailhead Rooftop (SJS02)

Lat: 37.881699°NLon: 121.914173°WElev: 3904.0ft.

NA

62°F

17°C

Humidity 29%
Wind Speed SSW 8 MPH
Barometer NA
Dewpoint 29°F (-2°C)
Visibility NA
Last update 17 Aug 02:40 PM PDT
Extended Forecast for

3 Miles E Walnut Creek CA

  • This Afternoon

    This Afternoon: Sunny, with a high near 78. West southwest wind around 14 mph, with gusts as high as 20 mph.

    High: 78 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 56. South wind 8 to 11 mph, with gusts as high as 18 mph.

    Low: 56 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 82. West southwest wind around 9 mph.

    High: 82 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 56. Southwest wind 6 to 10 mph, with gusts as high as 18 mph.

    Low: 56 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 84. West southwest wind 7 to 9 mph.

    High: 84 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 56.

    Low: 56 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 92.

    High: 92 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 59.

    Low: 59 °F

    Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

Detailed Forecast

This Afternoon
Sunny, with a high near 78. West southwest wind around 14 mph, with gusts as high as 20 mph.
Tonight
Mostly clear, with a low around 56. South wind 8 to 11 mph, with gusts as high as 18 mph.
Monday
Sunny, with a high near 82. West southwest wind around 9 mph.
Monday Night
Mostly clear, with a low around 56. Southwest wind 6 to 10 mph, with gusts as high as 18 mph.
Tuesday
Sunny, with a high near 84. West southwest wind 7 to 9 mph.
Tuesday Night
Mostly clear, with a low around 56.
Wednesday
Sunny, with a high near 92.
Wednesday Night
Clear, with a low around 59.
Thursday
Sunny and hot, with a high near 97.
Thursday Night
Mostly clear, with a low around 59.
Friday
Sunny, with a high near 94.
Friday Night
Mostly clear, with a low around 59.
Saturday
Sunny, with a high near 91.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles E Walnut Creek CA
 37.9°N 122.01°W (Elev. 364 ft)
Last Update:
1:26 pm PDT Aug 17, 2025
Forecast Valid:
2pm PDT Aug 17, 2025-6pm PDT Aug 23, 2025
 
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