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

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

POR31-Iron Horse (LIB09)

Lat: 39.77898°NLon: 120.50284°WElev: 5001.0ft.

NA

76°F

24°C

Humidity 38%
Wind Speed WNW 5 MPH
Barometer NA
Dewpoint 49°F (9°C)
Visibility NA
Heat Index78°F (26°C)
Last update 17 Aug 04:40 PM PDT
Extended Forecast for

3 Miles WSW Portola CA

  • Tonight

    Tonight: Clear, with a low around 42. West wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 42 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 80. Light and variable wind becoming southwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 80 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 43. Southwest wind 5 to 10 mph becoming light in the evening. Winds could gust as high as 20 mph.

    Low: 43 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 84. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 84 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 42. Southwest wind 5 to 10 mph becoming light in the evening. Winds could gust as high as 20 mph.

    Low: 42 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 87. Calm wind becoming west around 5 mph in the afternoon.

    High: 87 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 46.

    Low: 46 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 52.

    Low: 52 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 42. West wind 5 to 10 mph, with gusts as high as 20 mph.
Monday
Sunny, with a high near 80. Light and variable wind becoming southwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Monday Night
Clear, with a low around 43. Southwest wind 5 to 10 mph becoming light in the evening. Winds could gust as high as 20 mph.
Tuesday
Sunny, with a high near 84. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Tuesday Night
Clear, with a low around 42. Southwest wind 5 to 10 mph becoming light in the evening. Winds could gust as high as 20 mph.
Wednesday
Sunny, with a high near 87. Calm wind becoming west around 5 mph in the afternoon.
Wednesday Night
Clear, with a low around 46.
Thursday
Sunny, with a high near 93.
Thursday Night
Mostly clear, with a low around 52.
Friday
Sunny, with a high near 94.
Friday Night
Mostly clear, with a low around 53.
Saturday
A slight chance of showers and thunderstorms. Sunny, with a high near 92.
Saturday Night
Mostly clear, with a low around 52.
Sunday
Sunny, with a high near 90.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW Portola CA
 39.8°N 120.52°W (Elev. 4908 ft)
Last Update:
2:15 pm PDT Aug 17, 2025
Forecast Valid:
4pm PDT Aug 17, 2025-6pm PDT Aug 24, 2025
 
Forecast Discussion
 
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Additional Resources

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