Forecast Details for Petaluma, CA

Recent Locations: Petaluma, CA

Overnight: Patchy fog between 4am and 5am. Otherwise, partly cloudy, with a low around 45. West wind 7 to 10 mph, with gusts as high as 18 mph.

Tuesday: Patchy fog between 7am and 8am. Otherwise, sunny, with a high near 68. West wind 5 to 10 mph increasing to 12 to 17 mph in the afternoon.

Tuesday Night: Patchy fog after 2am. Otherwise, mostly clear, with a low around 44. West wind 12 to 17 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 21 mph.

Wednesday: Patchy fog before 8am. Otherwise, sunny, with a high near 72. Light west wind increasing to 9 to 14 mph in the afternoon.

Wednesday Night: Patchy fog after 2am. Otherwise, mostly clear, with a low around 46. West wind 7 to 14 mph.

Thursday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 74.

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

Friday: Mostly sunny, with a high near 74.

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

Saturday: Mostly sunny, with a high near 69.

Saturday Night: Mostly clear, with a low around 48.

Sunday: Sunny, with a high near 73.

Sunday Night: Clear, with a low around 50.

Monday: Sunny, with a high near 78.

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 Nimbostratus Clouds?

Home - Education - Cloud Types - Nimbostratus Clouds

Nimbostratus Clouds Next Topic: Precipitation

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: Precipitation

Weather Topic: What is Rain?

Home - Education - Precipitation - Rain

Rain Next Topic: Shelf Clouds

Precipitation in the form of water droplets is called rain. Rain generally has a tendency to fall with less intensity over a greater period of time, and when rainfall is more severe it is usually less sustained.

Rain is the most common form of precipitation and happens with greater frequency depending on the season and regional influences. Cities have been shown to have an observable effect on rainfall, due to an effect called the urban heat island. Compared to upwind, monthly rainfall between twenty and forty miles downwind of cities is 30% greater.

Next Topic: Shelf Clouds