Forecast Details for Boston, MA

Recent Locations: Boston, MA

Overnight: Cloudy, with a low around 53. West wind around 7 mph.

Friday: Cloudy, then gradually becoming mostly sunny, with a high near 64. Northwest wind 7 to 11 mph.

Friday Night: Partly cloudy, with a low around 41. Northwest wind 5 to 7 mph.

Saturday: A slight chance of rain before 9am, then showers likely, mainly after 2pm. Mostly cloudy, with a high near 46. Southeast wind 7 to 10 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

Saturday Night: Showers. Low around 41. Southeast wind 6 to 8 mph. Chance of precipitation is 90%.

Sunday: Showers likely, mainly before 7am. Mostly cloudy, with a high near 59. Southwest wind 6 to 10 mph. Chance of precipitation is 60%.

Sunday Night: Showers likely. Cloudy, with a low around 41. North wind around 7 mph. Chance of precipitation is 70%.

Monday: A chance of showers before noon. Mostly cloudy, with a high near 48. North wind around 7 mph. Chance of precipitation is 50%.

Monday Night: Mostly cloudy, with a low around 37. East wind around 5 mph becoming light and variable.

Tuesday: A chance of showers after 10am. Partly sunny, with a high near 47. North wind 7 to 11 mph becoming south in the morning. Winds could gust as high as 21 mph. Chance of precipitation is 30%.

Tuesday Night: A chance of showers. Partly cloudy, with a low around 30. West wind around 9 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

Wednesday: Mostly sunny, with a high near 47. West wind around 10 mph, with gusts as high as 20 mph.

Wednesday Night: Mostly clear, with a low around 32. West wind around 6 mph.

Thursday: Mostly sunny, with a high near 54. Southwest wind 6 to 10 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 Contrails?

Home - Education - Cloud Types - Contrails

Next Topic: Cumulonimbus Clouds

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: Cumulonimbus Clouds

Weather Topic: What are Cumulus Clouds?

Home - Education - Cloud Types - Cumulus Clouds

Next Topic: Drizzle

Cumulus clouds are fluffy and textured with rounded tops, and may have flat bottoms. The border of a cumulus cloud is clearly defined, and can have the appearance of cotton or cauliflower.

Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall, becoming cumulus congestus and possibly the even taller cumulonimbus clouds. When cumulus clouds become taller, they have a greater chance of producing precipitation.

Next Topic: Drizzle