Severe Thunderstorms and Flooding from the Southern Plains to the Great Lakes; Record Heat in the East

Widely scattered severe thunderstorms may produce damaging winds, hail, and flash flooding from the southern Plains into the lower Great Lakes. Elevated to locally critical fire weather conditions will persist across portions of the Southwest and Southern High Plains due to gusty winds and dry conditions. An early-season heatwave will challenge temperature records across the eastern U.S.. Read More >

Current conditions at

San Francisco, San Francisco International Airport (KSFO)

Lat: 37.61961°NLon: 122.36558°WElev: 10.0ft.

Clear

55°F

13°C

Humidity 76%
Wind Speed WNW 9 MPH
Barometer 29.96 in (1014.56 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 20 May 03:00 AM PDT
Extended Forecast for

Hillsborough CA

  • Overnight

    Overnight: Mostly clear, with a low around 52. Calm wind.

    Low: 52 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 78. Calm wind becoming west southwest 5 to 8 mph in the afternoon.

    High: 78 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 49. West southwest wind around 6 mph becoming calm  in the evening.

    Low: 49 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 76. Calm wind becoming west 5 to 9 mph in the afternoon.

    High: 76 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 50. Southwest wind 3 to 8 mph.

    Low: 50 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 73.

    High: 73 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 51.

    Low: 51 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 52. Calm wind.
Wednesday
Sunny, with a high near 78. Calm wind becoming west southwest 5 to 8 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 49. West southwest wind around 6 mph becoming calm in the evening.
Thursday
Sunny, with a high near 76. Calm wind becoming west 5 to 9 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 50. Southwest wind 3 to 8 mph.
Friday
Sunny, with a high near 73.
Friday Night
Partly cloudy, with a low around 52.
Saturday
Mostly sunny, with a high near 66.
Saturday Night
Partly cloudy, with a low around 51.
Sunday
Mostly sunny, with a high near 66.
Sunday Night
Partly cloudy, with a low around 50.
Memorial Day
Mostly sunny, with a high near 66.
Monday Night
Partly cloudy, with a low around 50.
Tuesday
Mostly sunny, with a high near 65.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Hillsborough CA
 37.55°N 122.38°W (Elev. 463 ft)
1:26 am PDT May 20, 2026
3am PDT May 20, 2026-6pm PDT May 26, 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