National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Prolonged Atmospheric River in the Northwest; Snow in the North-Central US

A prolonged atmospheric river will bring heavy rainfall which may lead to widespread urban and river flooding, heavy mountain snow, along with gusty winds to the Pacific Northwest into the northern Rockies through much of the week. A clipper will bring a period of snow across the upper Midwest and the Great Lakes into Tuesday, before a stronger system bring more wintry impacts. Read More >

Current conditions at

Boston, Logan International Airport (KBOS)

Lat: 42.36°NLon: 71.01°WElev: 20ft.

Fair

15°F

-9°C

Humidity 49%
Wind Speed W 7 mph
Barometer 30.23 in (1023.5 mb)
Dewpoint -1°F (-18°C)
Visibility 10.00 mi
Wind Chill5°F (-15°C)
Last update 9 Dec 4:54 am EST
Extended Forecast for

Cambridge MA

  • Today

    Today: Increasing clouds, with a high near 30. Light and variable wind.

    High: 30 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A chance of snow showers, mainly before 2am. Mostly cloudy, with a low around 24. South wind 11 to 16 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.

    Low: 24 °F

    Chance Snow
    Showers

  • Wednesday

    Wednesday: Rain, mainly after 5pm. High near 46. Breezy, with a south wind 13 to 22 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 46 °F

    Mostly Cloudy
    then Rain and
    Breezy

  • Wednesday Night

    Wednesday Night: Rain before 10pm, then a chance of showers between 10pm and 4am. Low around 33. Southwest wind 14 to 17 mph, with gusts as high as 31 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 33 °F

    Rain then
    Chance
    Showers

  • Thursday

    Thursday: A slight chance of rain and snow showers before 10am, then a slight chance of rain showers between 10am and 1pm, then a slight chance of snow showers after 1pm. Mostly sunny, with a high near 35. Breezy, with a west wind 16 to 20 mph, with gusts as high as 34 mph. Chance of precipitation is 20%.

    High: 35 °F

    Slight Chance
    Rain/Snow and
    Breezy

  • Thursday Night

    Thursday Night: A slight chance of snow showers before 3am. Partly cloudy, with a low around 24. Breezy, with a west wind 16 to 21 mph decreasing to 9 to 14 mph after midnight. Chance of precipitation is 20%.

    Low: 24 °F

    Slight Chance
    Snow Showers
    and Breezy

  • Friday

    Friday: Sunny, with a high near 34. West wind 10 to 13 mph, with gusts as high as 28 mph.

    High: 34 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 24. Southwest wind around 7 mph.

    Low: 24 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 37. Southwest wind 6 to 10 mph, with gusts as high as 22 mph.

    High: 37 °F

    Partly Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 30. Light and variable wind.
Tonight
A chance of snow showers, mainly before 2am. Mostly cloudy, with a low around 24. South wind 11 to 16 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.
Wednesday
Rain, mainly after 5pm. High near 46. Breezy, with a south wind 13 to 22 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
Rain before 10pm, then a chance of showers between 10pm and 4am. Low around 33. Southwest wind 14 to 17 mph, with gusts as high as 31 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
A slight chance of rain and snow showers before 10am, then a slight chance of rain showers between 10am and 1pm, then a slight chance of snow showers after 1pm. Mostly sunny, with a high near 35. Breezy, with a west wind 16 to 20 mph, with gusts as high as 34 mph. Chance of precipitation is 20%.
Thursday Night
A slight chance of snow showers before 3am. Partly cloudy, with a low around 24. Breezy, with a west wind 16 to 21 mph decreasing to 9 to 14 mph after midnight. Chance of precipitation is 20%.
Friday
Sunny, with a high near 34. West wind 10 to 13 mph, with gusts as high as 28 mph.
Friday Night
Partly cloudy, with a low around 24. Southwest wind around 7 mph.
Saturday
Partly sunny, with a high near 37. Southwest wind 6 to 10 mph, with gusts as high as 22 mph.
Saturday Night
A chance of snow after 9pm, mixing with rain after midnight. Mostly cloudy, with a low around 25. West wind around 8 mph. Chance of precipitation is 40%.
Sunday
A chance of rain and snow. Mostly cloudy, with a high near 33. Northwest wind 7 to 10 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.
Sunday Night
Partly cloudy, with a low around 15. Northwest wind around 9 mph.
Monday
Sunny, with a high near 26. Northwest wind 8 to 10 mph, with gusts as high as 21 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Cambridge MA
 42.37°N 71.1°W (Elev. 10 ft)
Last Update:
5:02 am EST Dec 9, 2025
Forecast Valid:
5am EST Dec 9, 2025-6pm EST Dec 15, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation