Forecast Details for San Jose, CA

Recent Locations: San Jose, CA

Tonight: A 30 percent chance of rain, mainly after 1am. Mostly cloudy, with a low around 48. West southwest wind around 6 mph. New precipitation amounts of less than a tenth of an inch possible.

Sunday: A 20 percent chance of rain before 11am. Mostly cloudy, with a high near 62. West northwest wind 5 to 8 mph. New precipitation amounts of less than a tenth of an inch possible.

Sunday Night: Patchy fog after 4am. Otherwise, partly cloudy, with a low around 45. West northwest wind around 6 mph becoming calm in the evening.

Monday: Patchy fog before 8am. Otherwise, sunny, with a high near 72. Calm wind becoming northwest 5 to 8 mph in the afternoon.

Monday Night: Patchy fog after 3am. Otherwise, mostly clear, with a low around 47. Northwest wind 5 to 10 mph becoming light and variable in the evening. Winds could gust as high as 18 mph.

Tuesday: Sunny, with a high near 78.

Tuesday Night: Partly cloudy, with a low around 50.

Wednesday: Sunny, with a high near 79.

Wednesday Night: Patchy fog after 5am. Otherwise, partly cloudy, with a low around 51.

Thursday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 75.

Thursday Night: Partly cloudy, with a low around 50.

Friday: Mostly sunny, with a high near 71.

Friday Night: Mostly cloudy, with a low around 49.

Saturday: Mostly sunny, with a high near 69.

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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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 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

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