Forecast Details for San Francisco, CA

Recent Locations: San Francisco, CA

This Afternoon: Sunny, with a high near 67. Breezy, with a west wind 17 to 23 mph, with gusts as high as 28 mph.

Tonight: A slight chance of drizzle after 11pm. Mostly cloudy, with a low around 55. Breezy, with a west wind 14 to 22 mph, with gusts as high as 28 mph.

Tuesday: Mostly cloudy, then gradually becoming sunny, with a high near 66. West southwest wind 11 to 21 mph, with gusts as high as 26 mph.

Tuesday Night: Partly cloudy, with a low around 53. West wind 14 to 21 mph, with gusts as high as 25 mph.

Wednesday: Mostly sunny, with a high near 66. Breezy, with a west wind 14 to 22 mph, with gusts as high as 28 mph.

Wednesday Night: Mostly clear, with a low around 53. Breezy.

Thursday: Sunny, with a high near 69.

Thursday Night: Mostly clear, with a low around 53.

Friday: Sunny, with a high near 66.

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

Saturday: Mostly sunny, with a high near 67.

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

Sunday: Sunny, with a high near 70.

Want more detail? Get the Complete 7 Day and Night Detailed Forecast!

Current U.S. National Radar--Current

The Current National Weather Radar is shown below with a UTC Time (subtract 5 hours from UTC to get Eastern Time).

National Weather Forecast--Current

The Current National Weather Forecast and National Weather Map are shown below.

National Weather Forecast for Tomorrow

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

North America Water Vapor (Moisture)

This map shows recent moisture content over North America. Bright and colored areas show high moisture (ie, clouds); brown indicates very little moisture present; black indicates no moisture.

Weather Topic: What are Mammatus Clouds?

Home - Education - Cloud Types - Mammatus Clouds

Mammatus Clouds Next Topic: Nimbostratus Clouds

A mammatus cloud is a cloud with a unique feature which resembles a web of pouches hanging along the base of the cloud.

In the United States, mammatus clouds tend to form in the warmer months, commonly in the Midwest and eastern regions.

While they usually form at the bottom of a cumulonimbis cloud, they can also form under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds warn that severe weather is close.

Next Topic: Nimbostratus Clouds

Weather Topic: What is Precipitation?

Home - Education - Precipitation - Precipitation

Next Topic: Rain

Precipitation can refer to many different forms of water that may fall from clouds. Precipitation occurs after a cloud has become saturated to the point where its water particles are more dense than the air below the cloud.

In most cases, precipitation will reach the ground, but it is not uncommon for precipitation to evaporate before it reaches the earth's surface. When precipitation evaporates before it contacts the ground it is called Virga. Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog and mist are not considered precipitation because the water vapor which constitutes them isn't dense enough to fall to the ground.

Next Topic: Rain