Heavy Lake Effect Snow Downwind of Lakes Erie and Ontario; Fire Weather Concerns in the Southern Plains and Southeast

A multi-day heavy lake effect snow event is expected downwind of Lakes Erie and Ontario through New Year's Day. There is increasing confidence in snow squalls causing bursts of snow & gusty winds on New Year's Eve. Elevated fire weather conditions will continue today over parts of the Southern Plains and across much of the Southeast U.S. Read More >

Hazardous Weather Conditions

Coastal Flood Advisory in effect from December 31, 05:00 AM PST until January 4, 02:00 PM PST

Current conditions at

San Francisco, San Francisco International Airport (KSFO)

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

Mostly Cloudy

49°F

9°C

Humidity	73%
Wind Speed	ESE 8 MPH
Barometer	30.2 in (1022.69 mb)
Dewpoint	41°F (5°C)
Visibility	10.00 mi
Wind Chill	46°F (8°C)
Last update	30 Dec 11:56 AM PST

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

San Mateo CA

Coastal Flood Advisory December 31, 05:00am until January 4, 02:00pm

Click here for hazard details and duration

Coastal Flood Advisory

This Afternoon
High: 54 °F
Cloudy
Tonight
Low: 48 °F
Chance Rain
Wednesday
High: 55 °F
Rain
Wednesday Night
Low: 50 °F
Rain
New Year's Day
High: 60 °F
Rain
Thursday Night
Low: 55 °F
Rain
Friday
High: 61 °F
Rain and
Breezy
Friday Night
Low: 51 °F
Rain
Saturday
High: 58 °F
Rain

Detailed Forecast

This Afternoon

Cloudy, with a high near 54. North wind around 8 mph.

Tonight

A 30 percent chance of rain, mainly after 4am. Mostly cloudy, with a low around 48. North northeast wind 5 to 7 mph becoming southeast after midnight.

Wednesday

Rain, mainly after 10am. High near 55. South southeast wind around 6 mph becoming east in the morning. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

Wednesday Night

Rain. Low around 50. East northeast wind around 6 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

New Year's Day

Rain. High near 60. East northeast wind 6 to 9 mph becoming south in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

Thursday Night

Rain. Low around 55. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

Friday

Rain. High near 61. Breezy. Chance of precipitation is 80%.

Friday Night

Rain. Cloudy, with a low around 51.

Saturday

Rain. Mostly cloudy, with a high near 58.

Saturday Night

Rain likely. Mostly cloudy, with a low around 49.

Sunday

Rain likely. Mostly cloudy, with a high near 57.