Forecast Details for San Francisco, CA

Recent Locations: San Francisco, CA  
Tonight: Partly cloudy, with a low around 50. South wind 3 to 7 mph.
Monday: A 20 percent chance of rain. Partly sunny, with a high near 60. Light and variable wind becoming west 5 to 8 mph in the morning. New precipitation amounts of less than a tenth of an inch possible.
Monday Night: Mostly cloudy, then gradually becoming clear, with a low around 44. West northwest wind around 10 mph.
Tuesday: Sunny, with a high near 59. North wind around 7 mph.
Tuesday Night: Mostly clear, with a low around 45. Northwest wind 5 to 8 mph.
Wednesday: Sunny, with a high near 61.
Wednesday Night: Partly cloudy, with a low around 50.
Thursday: A chance of rain, mainly after 11am. Mostly cloudy, with a high near 59.
Thursday Night: Rain likely. Mostly cloudy, with a low around 50.
Friday: Rain. Mostly cloudy, with a high near 57. Breezy.
Friday Night: Rain. Mostly cloudy, with a low around 45.
Saturday: Rain. Mostly cloudy, with a high near 53.
Saturday Night: A chance of rain. Mostly cloudy, with a low around 43.
Sunday: A slight chance of rain. Mostly sunny, with a high near 55.

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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).

Current U.S. National Radar

National Weather Forecast--Current

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

Today's National Weather Map

National Weather Forecast for Tomorrow

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

Tomorrows National Weather Map

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.

North American Water Vapor Map

Weather Topic: What are Shelf Clouds?

Home - Education - Cloud Types - Shelf Clouds

Shelf Clouds Next Topic: Sleet

A shelf cloud is similar to a wall cloud, but forms at the front of a storm cloud, instead of at the rear, where wall clouds form.

A shelf cloud is caused by a series of events set into motion by the advancing storm; first, cool air settles along the ground where precipitation has just fallen. As the cool air is brought in, the warmer air is displaced, and rises above it, because it is less dense. When the warmer air reaches the bottom of the storm cloud, it begins to cool again, and the resulting condensation is a visible shelf cloud.

Next Topic: Sleet

Weather Topic: What is Snow?

Home - Education - Precipitation - Snow

Snow Next Topic: Stratocumulus Clouds

Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake, has unique characteristics, but all of them grow in a hexagonal structure. Snowfall can last for sustained periods of time and result in significant buildup of snow on the ground.

On the earth's surface, snow starts out light and powdery, but as it begins to melt it tends to become more granular, producing small bits of ice which have the consistency of sand. After several cycles of melting and freezing, snow can become very dense and ice-like, commonly known as snow pack.

Next Topic: Stratocumulus Clouds