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

Prolonged Atmospheric River Will Impact the Northwest Early this Week

A weather system in the Pacific Northwest will produce rain throughout the day, before a potent atmospheric river produces a prolonged round of heavy rainfall, widespread urban and river flooding, and high elevation snow to the region Monday through Wednesday. Showers and thunderstorms may produce isolated damaging winds, a brief tornado, and locally heavy rainfall across parts of Florida today. Read More >

Current conditions at

Philadelphia - Wings Field Airport (KLOM)

Lat: 40.14°NLon: 75.27°WElev: 282ft.

Mostly Cloudy

35°F

2°C

Humidity 68%
Wind Speed Calm
Barometer 30.06 in
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Last update 7 Dec 5:35 pm EST
Extended Forecast for

Bryn Mawr PA

  • Tonight

    Tonight: Partly cloudy, with a low around 24. Southwest wind 5 to 10 mph becoming north after midnight. Winds could gust as high as 20 mph.

    Low: 24 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 30. North wind 10 to 15 mph.

    High: 30 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 15. Northeast wind around 5 mph becoming calm after midnight.

    Low: 15 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Increasing clouds, with a high near 34. Calm wind becoming south around 5 mph in the afternoon.

    High: 34 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 29. Southwest wind 5 to 10 mph.

    Low: 29 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A chance of rain. Mostly cloudy, with a high near 45. Chance of precipitation is 40%.

    High: 45 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 41.

    High: 41 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of snow. Mostly cloudy, with a low around 27. Chance of precipitation is 40%.

    Low: 27 °F

    Chance Snow

Detailed Forecast

Tonight
Partly cloudy, with a low around 24. Southwest wind 5 to 10 mph becoming north after midnight. Winds could gust as high as 20 mph.
Monday
Partly sunny, with a high near 30. North wind 10 to 15 mph.
Monday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 15. Northeast wind around 5 mph becoming calm after midnight.
Tuesday
Increasing clouds, with a high near 34. Calm wind becoming south around 5 mph in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 29. Southwest wind 5 to 10 mph.
Wednesday
A chance of rain. Mostly cloudy, with a high near 45. Chance of precipitation is 40%.
Wednesday Night
Mostly cloudy, with a low around 33.
Thursday
Mostly sunny, with a high near 41.
Thursday Night
A chance of snow. Mostly cloudy, with a low around 27. Chance of precipitation is 40%.
Friday
A chance of rain and snow before 1pm, then a chance of snow. Partly sunny, with a high near 36. Chance of precipitation is 30%.
Friday Night
A chance of snow. Mostly cloudy, with a low around 21. Chance of precipitation is 30%.
Saturday
Partly sunny, with a high near 31.
Saturday Night
Partly cloudy, with a low around 20.
Sunday
Mostly sunny, with a high near 30.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Bryn Mawr PA
 40.02°N 75.32°W (Elev. 397 ft)
Last Update:
4:10 pm EST Dec 7, 2025
Forecast Valid:
5pm EST Dec 7, 2025-6pm EST Dec 14, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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