Forecast Details for Boston, MA

Recent Locations: Boston, MA

Overnight: A chance of showers, mainly after 5am. Areas of fog. Otherwise, cloudy, with a low around 56. Northeast wind around 6 mph. Chance of precipitation is 30%.

Tuesday: Showers likely and possibly a thunderstorm before 3pm, then a chance of showers and thunderstorms between 3pm and 5pm, then a chance of showers after 5pm. Areas of fog before 8am. Otherwise, cloudy, with a high near 69. Northeast wind 3 to 6 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

Tuesday Night: A chance of showers, with thunderstorms also possible after 11pm. Patchy fog after 11pm. Otherwise, cloudy, then gradually becoming partly cloudy, with a low around 60. West wind 5 to 7 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Wednesday: Sunny, with a high near 83. West wind 7 to 10 mph.

Wednesday Night: Mostly clear, with a low around 67. Southwest wind around 8 mph.

Thursday: Sunny, with a high near 84. West wind 10 to 13 mph.

Thursday Night: Mostly cloudy, with a low around 60. Northwest wind 5 to 8 mph.

Friday: Partly sunny, with a high near 74. Northwest wind around 6 mph.

Friday Night: A chance of showers after 5am. Mostly cloudy, with a low around 57. Southeast wind around 5 mph becoming light and variable in the evening. Chance of precipitation is 30%.

Saturday: A chance of showers before 7am, then a chance of showers after 1pm. Mostly cloudy, with a high near 68. East wind around 7 mph. Chance of precipitation is 30%.

Saturday Night: A chance of showers. Mostly cloudy, with a low around 56. East wind around 6 mph. Chance of precipitation is 50%.

Sunday: A chance of showers. Partly sunny, with a high near 69. Northeast wind 6 to 9 mph. Chance of precipitation is 40%.

Sunday Night: Mostly cloudy, with a low around 56. Southeast wind around 6 mph becoming light and variable after midnight.

Monday: Partly sunny, with a high near 74. South wind 5 to 7 mph.

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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