Forecast Details for Westford, MA

Recent Locations: Fincastle, VA Pittsburg, TX Westford, MA

Overnight: A chance of showers, mainly after 5am. Mostly cloudy, with a low around 51. Southwest wind around 6 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Tuesday: Showers, with thunderstorms also possible after 2pm. Patchy fog between 7am and 11am. High near 57. Southwest wind 5 to 8 mph becoming northeast in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

Tuesday Night: Showers and thunderstorms likely before 1am, then a chance of showers. Mostly cloudy, with a low around 39. East wind around 6 mph becoming northwest after midnight. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

Wednesday: Showers likely, mainly after 2pm. Mostly cloudy, with a high near 67. Southwest wind around 8 mph becoming northwest in the afternoon. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

Wednesday Night: Showers likely, mainly before 2am. Cloudy, with a low around 36. Northeast wind around 6 mph. Chance of precipitation is 70%.

Thursday: A chance of showers. Cloudy, with a high near 41. Northeast wind around 8 mph. Chance of precipitation is 40%.

Thursday Night: A chance of showers. Cloudy, with a low around 35. East wind 3 to 6 mph. Chance of precipitation is 50%.

Friday: Cloudy, with a high near 65. Light and variable wind becoming southwest 5 to 9 mph in the morning. Winds could gust as high as 20 mph.

Friday Night: Mostly cloudy, with a low around 52. Southwest wind around 8 mph.

Saturday: Mostly cloudy, with a high near 67. West wind 5 to 8 mph becoming east in the afternoon.

Saturday Night: A chance of rain. Mostly cloudy, with a low around 42. East wind around 6 mph. Chance of precipitation is 40%.

Sunday: A chance of rain. Mostly cloudy, with a high near 70. Southwest wind 6 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 50%.

Sunday Night: A chance of rain. Mostly cloudy, with a low around 43. Southwest wind around 8 mph. Chance of precipitation is 50%.

Monday: A chance of rain. Mostly cloudy, with a high near 53. Northwest wind around 8 mph. Chance of precipitation is 30%.

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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