Forecast Details for Boston, MA

Recent Locations: Block Island, RI Lincoln, NE Boston, MA

Tonight: Patchy drizzle before 3am, then scattered showers, mainly between 3am and 5am. Cloudy, with a low around 38. East wind 9 to 14 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Sunday: Patchy showers, then showers and possibly a thunderstorm after 1pm. High near 59. Southeast wind 6 to 10 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Sunday Night: Showers likely, mainly before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 38. West wind 10 to 13 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Monday: Mostly sunny, with a high near 53. West wind 9 to 14 mph.

Monday Night: A slight chance of rain after 1am. Partly cloudy, with a low around 36. West wind around 6 mph becoming calm in the evening. Chance of precipitation is 20%.

Tuesday: A chance of rain and snow showers before 10am, then a chance of rain showers. Partly sunny, with a high near 48. Northwest wind 5 to 10 mph. Chance of precipitation is 50%. Little or no snow accumulation expected.

Tuesday Night: Partly cloudy, with a low around 28. Northwest wind 7 to 9 mph.

Wednesday: Sunny, with a high near 48. Northwest wind 5 to 7 mph becoming southeast in the afternoon.

Wednesday Night: Clear, with a low around 33. South wind 6 to 8 mph.

Thursday: Sunny, with a high near 58. South wind 7 to 13 mph.

Thursday Night: Partly cloudy, with a low around 43. South wind 8 to 10 mph.

Friday: Mostly sunny, with a high near 63. West wind 7 to 9 mph becoming south in the afternoon.

Friday Night: Partly cloudy, with a low around 43. Southwest wind around 8 mph.

Saturday: Mostly sunny, with a high near 62. West wind 7 to 9 mph becoming southwest in the afternoon.

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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 Mammatus Clouds?

Home - Education - Cloud Types - Mammatus Clouds

Mammatus Clouds Next Topic: Nimbostratus Clouds

A mammatus cloud is a cloud with a unique feature which resembles a web of pouches hanging along the base of the cloud.

In the United States, mammatus clouds tend to form in the warmer months, commonly in the Midwest and eastern regions.

While they usually form at the bottom of a cumulonimbis cloud, they can also form under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds warn that severe weather is close.

Next Topic: Nimbostratus Clouds

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