Forecast Details for San Francisco, CA

Recent Locations: San Francisco, CA  
Current Alerts for San Francisco, CA: Beach Hazards Statement
Tonight: Increasing clouds, with a low around 57. West wind 13 to 21 mph, with gusts as high as 28 mph.
Monday: Cloudy through mid morning, then gradual clearing, with a high near 69. Breezy, with a west southwest wind 10 to 15 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 29 mph.
Monday Night: Increasing clouds, with a low around 57. Breezy, with a west wind 13 to 23 mph, with gusts as high as 30 mph.
Tuesday: Mostly cloudy, then gradually becoming sunny, with a high near 69. West southwest wind 11 to 15 mph, with gusts as high as 20 mph.
Tuesday Night: Partly cloudy, with a low around 56. Breezy, with a west wind 15 to 23 mph, with gusts as high as 30 mph.
Wednesday: Mostly sunny, with a high near 68.
Wednesday Night: Partly cloudy, with a low around 56. Breezy.
Thursday: Mostly sunny, with a high near 68.
Thursday Night: Partly cloudy, with a low around 56.
Friday: Mostly sunny, with a high near 67.
Friday Night: Partly cloudy, with a low around 56.
Saturday: Mostly sunny, with a high near 67.
Saturday Night: Partly cloudy, with a low around 56.
Sunday: Mostly sunny, with a high near 67.

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Current U.S. National Radar--Current

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Weather Topic: What are Nimbostratus Clouds?

Home - Education - Cloud Types - Nimbostratus Clouds

nimbostratus clouds Next Topic: Stratocumulus Clouds

A nimbostratus cloud is similar to a stratus cloud in its formless, smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud, because it is thicker.

Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat of moderate to heavy precipitation. In some cases, the precipitation may evaporate before reaching the ground, a phenomenon known as virga.

Next Topic: Stratocumulus Clouds

Weather Topic: What are Contrails?

Home - Education - Cloud Types - Contrails

contrails Next Topic: Fog

A contrail is an artificial cloud, created by the passing of an aircraft.

Contrails form because water vapor in the exhaust of aircraft engines is suspended in the air under certain temperatures and humidity conditions. These contrails are called exhaust contrails.

Another type of contrail can form due to a temporary reduction in air pressure moving over the plane's surface, causing condensation. These are called aerodynamic contrails.

When you can see your breath on a cold day, it is also because of condensation. The reason contrails last longer than the condensation from your breath is because the water in contrails freezes into ice particles.

Next Topic: Fog