Severe Thunderstorms for the Center of the Nation; Fire Weather Concerns; Flooding Issues for the Great Lakes Region

A round of severe thunderstorms are forecast across areas of the Southern Plains, Mississippi Valley and Great Lakes this afternoon and tonight; The threat for flash flooding will also accompany these storms. The rainfall for the Great Lakes region could prolong the ongoing flooding. Where the rain is needed, the Southern High Plains, critical fire weather concerns through today. Read More >

Current conditions at

LOS ALTOS (LOAC1)

Lat: 37.35472°NLon: 122.14167°WElev: 539.0ft.

NA

56°F

13°C

Humidity 54%
Wind Speed WSW 3 MPH
Barometer NA
Dewpoint 39°F (4°C)
Visibility NA
Last update 17 Apr 08:10 PM PDT
Extended Forecast for

2 Miles NNW Portola Valley CA

  • Tonight

    Tonight: Partly cloudy, with a low around 46. West wind around 5 mph becoming calm  in the evening.

    Low: 46 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 76. Calm wind becoming west around 6 mph in the afternoon.

    High: 76 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 49. West wind around 5 mph becoming calm  in the evening.

    Low: 49 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 73. Calm wind becoming west southwest 5 to 7 mph in the afternoon.

    High: 73 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers after 11pm.  Partly cloudy, with a low around 49. South wind 5 to 7 mph.

    Low: 49 °F

    Slight Chance
    Showers

  • Monday

    Monday: A 50 percent chance of showers.  Partly sunny, with a high near 71. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 71 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Rain likely.  Mostly cloudy, with a low around 51. Chance of precipitation is 70%.

    Low: 51 °F

    Rain Likely

  • Tuesday

    Tuesday: Rain likely before 11am, then showers likely and possibly a thunderstorm after 11am.  Mostly cloudy, with a high near 66.

    High: 66 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A chance of rain.  Mostly cloudy, with a low around 49.

    Low: 49 °F

    Chance Rain

Detailed Forecast

Tonight
Partly cloudy, with a low around 46. West wind around 5 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 76. Calm wind becoming west around 6 mph in the afternoon.
Saturday Night
Mostly cloudy, with a low around 49. West wind around 5 mph becoming calm in the evening.
Sunday
Partly sunny, with a high near 73. Calm wind becoming west southwest 5 to 7 mph in the afternoon.
Sunday Night
A 20 percent chance of showers after 11pm. Partly cloudy, with a low around 49. South wind 5 to 7 mph.
Monday
A 50 percent chance of showers. Partly sunny, with a high near 71. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
Rain likely. Mostly cloudy, with a low around 51. Chance of precipitation is 70%.
Tuesday
Rain likely before 11am, then showers likely and possibly a thunderstorm after 11am. Mostly cloudy, with a high near 66.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 49.
Wednesday
A slight chance of rain. Mostly sunny, with a high near 66.
Wednesday Night
Mostly clear, with a low around 48.
Thursday
Sunny, with a high near 68.
Thursday Night
Mostly clear, with a low around 47.
Friday
Mostly sunny, with a high near 70.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Portola Valley CA
 37.42°N 122.23°W (Elev. 397 ft)
1:26 pm PDT Apr 17, 2026
8pm PDT Apr 17, 2026-6pm PDT Apr 24, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database