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

Heat the Southwest; Fire Weather in the Central U.S.; Kona Low Impacting Hawaii

A rare March heat wave is ongoing with much above-normal temperatures over the Southwest U.S. through this weekend. Periods of critical fire weather will persist from the central Rockies to the central and southern Plains through the weekend as gusty winds and low relative humidity continue. A Kona low will continue to bring several rounds of moderate to heavy rainfall to Hawaii through Sunday. Read More >

Hazardous Weather Conditions

Current conditions at

Chester County Airport (KMQS)

Lat: 39.98°NLon: 75.87°WElev: 659ft.

Fog

45°F

7°C

Humidity 100%
Wind Speed W 7 mph
Barometer 29.75 in
Dewpoint 45°F (7°C)
Visibility 0.15 mi
Wind Chill41°F (5°C)
Last update 21 Mar 4:55 am EDT
Extended Forecast for

Elverson PA

Dense Fog Advisory until March 21, 08:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory until March 21, 08:00am

    NOW until 8:00am Sat

    Dense Fog Advisory

  • Overnight

    Low: 46 °F

    Areas Dense
    Fog

  • Saturday

    Saturday: Areas of dense fog before 8am. Otherwise, mostly sunny, with a high near 56. North wind 5 to 10 mph.

    High: 56 °F

    Areas Dense
    Fog then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 42. East wind 5 to 10 mph becoming south after midnight. Winds could gust as high as 20 mph.

    Low: 42 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Partly sunny, with a high near 71. Southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 71 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then showers after 2am. Low around 43. Northwest wind around 10 mph becoming north after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 43 °F

    Showers

  • Monday

    Monday: Showers, mainly before 8am. High near 49. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 49 °F

    Showers then
    Chance
    Showers

  • Monday Night

    Monday Night: Mostly clear, with a low around 28.

    Low: 28 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 47.

    High: 47 °F

    Sunny

Detailed Forecast

Overnight
Areas of dense fog. Otherwise, partly cloudy, with a low around 46. Northwest wind around 5 mph.
Saturday
Areas of dense fog before 8am. Otherwise, mostly sunny, with a high near 56. North wind 5 to 10 mph.
Saturday Night
Mostly cloudy, with a low around 42. East wind 5 to 10 mph becoming south after midnight. Winds could gust as high as 20 mph.
Sunday
A chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Partly sunny, with a high near 71. Southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday Night
A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then showers after 2am. Low around 43. Northwest wind around 10 mph becoming north after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Monday
Showers, mainly before 8am. High near 49. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
Mostly clear, with a low around 28.
Tuesday
Sunny, with a high near 47.
Tuesday Night
Mostly cloudy, with a low around 34.
Wednesday
Partly sunny, with a high near 53.
Wednesday Night
Mostly cloudy, with a low around 36.
Thursday
Mostly cloudy, with a high near 56.
Thursday Night
Rain likely. Mostly cloudy, with a low around 41. Chance of precipitation is 60%.
Friday
Rain likely. Partly sunny, with a high near 51. Chance of precipitation is 60%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Elverson PA
 40.17°N 75.84°W (Elev. 686 ft)
Last Update:
4:09 am EDT Mar 21, 2026
Forecast Valid:
5am EDT Mar 21, 2026-6pm EDT Mar 27, 2026
 
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