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

Tropical Storm Arthur and Heavy Rainfall in the South; Severe Weather in the Midwest

An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana tonight. Intense tornadoes, swaths of damaging gusts, and hail in excess of 2 inches in diameter possible. Tropical Storm Arthur will continue to produce strong winds across coastal Upper Texas and Louisiana tonight, as well as potentially life-threatening flooding across southern Louisiana into Mississippi. Read More >

Hazardous Weather Conditions

Current conditions at

San Francisco, San Francisco International Airport (KSFO)

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

Partly Cloudy

61°F

16°C

Humidity 77%
Wind Speed SSW 10 MPH
Barometer 29.9 in (1012.53 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 18 Jun 01:35 AM PDT
Extended Forecast for

Hillsborough CA

Coastal Flood Advisory June 18, 01:48am until June 18, 05:00am
Click here for hazard details and duration
Coastal Flood Advisory
  •  
    Coastal Flood Advisory June 18, 01:48am until June 18, 05:00am

    NOW until 5:00am Thu

    Coastal Flood Advisory

  • Overnight

    Low: 56 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 68. South southwest wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 68 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 56. South southwest wind 5 to 14 mph, with gusts as high as 24 mph.

    Low: 56 °F

    Increasing
    Clouds

  • Juneteenth

    Juneteenth: Mostly cloudy, then gradually becoming sunny, with a high near 72. South wind 5 to 13 mph, with gusts as high as 22 mph.

    High: 72 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Partly cloudy, with a low around 56. Southwest wind 9 to 14 mph becoming light south southwest after midnight. Winds could gust as high as 23 mph.

    Low: 56 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 71.

    High: 71 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 54.

    Low: 54 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 71.

    High: 71 °F

    Mostly Sunny

Detailed Forecast

Overnight
Mostly cloudy, with a low around 56. Southwest wind 5 to 7 mph.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 68. South southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Thursday Night
Increasing clouds, with a low around 56. South southwest wind 5 to 14 mph, with gusts as high as 24 mph.
Juneteenth
Mostly cloudy, then gradually becoming sunny, with a high near 72. South wind 5 to 13 mph, with gusts as high as 22 mph.
Friday Night
Partly cloudy, with a low around 56. Southwest wind 9 to 14 mph becoming light south southwest after midnight. Winds could gust as high as 23 mph.
Saturday
Mostly sunny, with a high near 71.
Saturday Night
Partly cloudy, with a low around 54.
Sunday
Mostly sunny, with a high near 71.
Sunday Night
Partly cloudy, with a low around 55.
Monday
Mostly sunny, with a high near 75.
Monday Night
Partly cloudy, with a low around 55.
Tuesday
Mostly sunny, with a high near 76.
Tuesday Night
Patchy fog. Otherwise, mostly clear, with a low around 56.
Wednesday
Mostly sunny, with a high near 78.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hillsborough CA
 37.55°N 122.35°W (Elev. 197 ft)
Last Update:
1:26 am PDT Jun 18, 2026
Forecast Valid:
1am PDT Jun 18, 2026-6pm PDT Jun 24, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation