Forecast Details for Boston, MA

Recent Locations: Roxbury, NY Boston, MA

Tonight: Mostly clear, with a low around 72. Southwest wind 8 to 10 mph.

Monday: A slight chance of showers between 2pm and 3pm. Partly sunny and hot, with a high near 91. Heat index values as high as 96. Southwest wind 8 to 14 mph. Chance of precipitation is 20%.

Monday Night: A chance of showers before 4am, then a chance of showers and thunderstorms between 4am and 5am, then showers likely and possibly a thunderstorm after 5am. Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 74. Southwest wind 7 to 10 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Tuesday: Showers likely and possibly a thunderstorm before 11am, then a chance of showers and thunderstorms between 11am and 3pm, then showers likely and possibly a thunderstorm after 3pm. Patchy fog before 7am. Otherwise, mostly cloudy, with a high near 89. Southwest wind around 7 mph becoming northwest in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Tuesday Night: Showers and thunderstorms likely before 11pm, then a chance of showers. Mostly cloudy, with a low around 69. North wind 3 to 5 mph. Chance of precipitation is 60%.

Wednesday: A slight chance of showers. Mostly cloudy, with a high near 79. Northeast wind 5 to 7 mph. Chance of precipitation is 20%.

Wednesday Night: Mostly cloudy, with a low around 67. East wind around 5 mph becoming calm in the evening.

Thursday: A chance of showers. Cloudy, with a high near 75. East wind 5 to 7 mph. Chance of precipitation is 40%.

Thursday Night: A chance of showers. Cloudy, with a low around 66. East wind 3 to 6 mph. Chance of precipitation is 50%.

Friday: A chance of showers. Mostly cloudy, with a high near 76. Northeast wind 6 to 8 mph. Chance of precipitation is 40%.

Friday Night: A chance of showers. Mostly cloudy, with a low around 65. East wind 3 to 6 mph. Chance of precipitation is 30%.

Saturday: Mostly cloudy, with a high near 76. East wind 6 to 8 mph.

Saturday Night: A chance of showers. Mostly cloudy, with a low around 65. Southeast wind 3 to 6 mph. Chance of precipitation is 30%.

Sunday: Mostly cloudy, with a high near 78. East wind 5 to 8 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)

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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