Forecast Details for Boston, MA

Recent Locations: Baltimore, MD Boise, ID Boston, MA

Tonight: Mostly cloudy, with a low around 12. Calm wind becoming northwest around 5 mph after midnight.

Friday: Mostly cloudy, with a high near 28. North wind 3 to 6 mph.

Friday Night: A chance of snow, mainly after 1am. Patchy fog after 5am. Otherwise, cloudy, with a low around 21. Calm wind. Chance of precipitation is 40%. Little or no snow accumulation expected.

Saturday: Snow. Patchy fog before 8am. High near 28. Light north wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 23 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.

Saturday Night: A chance of snow, mainly before 11pm. Mostly cloudy, with a low around 3. Northwest wind around 14 mph, with gusts as high as 29 mph. Chance of precipitation is 40%. New snow accumulation of less than a half inch possible.

Sunday: Mostly sunny, with a high near 16. Northwest wind 11 to 14 mph, with gusts as high as 25 mph.

Sunday Night: Partly cloudy, with a low around 2. Northwest wind 8 to 10 mph, with gusts as high as 24 mph.

Monday: Sunny, with a high near 21. Northwest wind 8 to 10 mph, with gusts as high as 20 mph.

Monday Night: Mostly clear, with a low around 6. Northwest wind around 7 mph.

Tuesday: Mostly sunny, with a high near 30. Northwest wind around 7 mph.

Tuesday Night: Partly cloudy, with a low around 12. West wind 3 to 5 mph.

Wednesday: Mostly sunny, with a high near 34. Northwest wind around 6 mph.

Wednesday Night: A chance of snow. Partly cloudy, with a low around 23. North wind around 6 mph becoming west in the evening. Chance of precipitation is 30%.

Thursday: Mostly sunny, with a high near 36. Northwest wind around 7 mph.

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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

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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