Forecast Details for Boston, MA

Recent Locations: Boston, MA  
Tonight: Mostly clear, with a low around 26. West wind 5 to 9 mph becoming light after midnight. Winds could gust as high as 21 mph.
Saturday: Mostly sunny, with a high near 43. West wind 6 to 8 mph.
Saturday Night: Partly cloudy, with a low around 29. West wind 9 to 11 mph.
Sunday: Mostly sunny, with a high near 43. Northwest wind 5 to 7 mph becoming calm in the afternoon.
Sunday Night: A chance of showers after 5am. Mostly cloudy, with a low around 34. Southeast wind 3 to 7 mph. Chance of precipitation is 30%.
Monday: Showers likely before 1pm, then a slight chance of showers after 2pm. Mostly cloudy, with a high near 65. Breezy, with a south wind 8 to 13 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 44 mph. Chance of precipitation is 60%.
Monday Night: A chance of showers before 11pm. Mostly cloudy, with a low around 34. West wind 15 to 17 mph, with gusts as high as 44 mph. Chance of precipitation is 50%.
Tuesday: Mostly sunny, with a high near 41. West wind 8 to 13 mph, with gusts as high as 28 mph.
Tuesday Night: Mostly cloudy, with a low around 30. Light and variable wind.
Wednesday: Snow likely after 8am, mixing with rain after 3pm. Mostly cloudy, with a high near 40. Calm wind becoming southeast around 6 mph in the morning. Chance of precipitation is 70%.
Wednesday Night: Rain likely. Mostly cloudy, with a low around 30. Northwest wind 6 to 9 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Thursday: Mostly sunny, with a high near 40. Northwest wind 7 to 9 mph.
Thursday Night: A chance of rain and snow showers. Mostly cloudy, with a low around 29. North wind 3 to 5 mph. Chance of precipitation is 30%.
Friday: A chance of rain and snow showers. Mostly cloudy, with a high near 46. East wind 5 to 8 mph becoming south in the afternoon. Chance of precipitation is 30%.

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Current U.S. National Radar--Current

The Current National Weather Radar is shown below with a UTC Time (subtract 5 hours from UTC to get Eastern Time).

Current U.S. National Radar

National Weather Forecast--Current

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Today's National Weather Map

National Weather Forecast for Tomorrow

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

Tomorrows National Weather Map

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.

North American Water Vapor Map

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

Weather Topic: What is Sleet?

Home - Education - Precipitation - Sleet

Sleet Next Topic: Snow

Sleet is a form of precipitation in which small ice pellets are the primary components. These ice pellets are smaller and more translucent than hailstones, and harder than graupel. Sleet is caused by specific atmospheric conditions and therefore typically doesn't last for extended periods of time.

The condition which leads to sleet formation requires a warmer body of air to be wedged in between two sub-freezing bodies of air. When snow falls through a warmer layer of air it melts, and as it falls through the next sub-freezing body of air it freezes again, forming ice pellets known as sleet. In some cases, water droplets don't have time to freeze before reaching the surface and the result is freezing rain.

Next Topic: Snow