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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

Philadelphia, Philadelphia International Airport (KPHL)

Lat: 39.87°NLon: 75.23°WElev: 7ft.

Overcast

70°F

21°C

Humidity 82%
Wind Speed S 8 mph
Barometer 30.01 in (1016.1 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 20 Sep 8:54 am EDT
Extended Forecast for

Merion Station PA

  • Today

    Today: Rain, with thunderstorms also possible after 5pm. High near 75. South wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 75 °F

    Rain

  • Tonight

    Tonight: Rain and possibly a thunderstorm before 9pm, then a chance of rain and thunderstorms between 9pm and 11pm. Low around 60. Southwest wind around 5 mph becoming north after midnight. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 60 °F

    Rain then
    Mostly Cloudy

  • Monday

    Monday: Increasing clouds, with a high near 69. Northeast wind around 10 mph.

    High: 69 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: Showers likely, mainly after 2am. Cloudy, with a low around 55. Northeast wind 5 to 10 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 55 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Showers likely, mainly before 2pm. Mostly cloudy, with a high near 63. Northeast wind 10 to 15 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

    High: 63 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A chance of showers. Mostly cloudy, with a low around 52. Chance of precipitation is 40%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 52 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers before 2pm. Mostly cloudy, with a high near 63. Chance of precipitation is 30%.

    High: 63 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers after 2am. Mostly cloudy, with a low around 52. Chance of precipitation is 30%.

    Low: 52 °F

    Mostly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: A chance of showers. Mostly cloudy, with a high near 63. Chance of precipitation is 30%.

    High: 63 °F

    Chance
    Showers

Detailed Forecast

Today
Rain, with thunderstorms also possible after 5pm. High near 75. South wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
Rain and possibly a thunderstorm before 9pm, then a chance of rain and thunderstorms between 9pm and 11pm. Low around 60. Southwest wind around 5 mph becoming north after midnight. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
Increasing clouds, with a high near 69. Northeast wind around 10 mph.
Monday Night
Showers likely, mainly after 2am. Cloudy, with a low around 55. Northeast wind 5 to 10 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday
Showers likely, mainly before 2pm. Mostly cloudy, with a high near 63. Northeast wind 10 to 15 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 52. Chance of precipitation is 40%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
A chance of showers before 2pm. Mostly cloudy, with a high near 63. Chance of precipitation is 30%.
Wednesday Night
A chance of showers after 2am. Mostly cloudy, with a low around 52. Chance of precipitation is 30%.
Thursday
A chance of showers. Mostly cloudy, with a high near 63. Chance of precipitation is 30%.
Thursday Night
A chance of showers after 2am. Mostly cloudy, with a low around 51. Chance of precipitation is 30%.
Friday
A chance of showers. Partly sunny, with a high near 64. Chance of precipitation is 30%.
Friday Night
Partly cloudy, with a low around 51.
Saturday
Partly sunny, with a high near 67.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Merion Station PA
 40.01°N 75.26°W (Elev. 299 ft)
Last Update:
4:09 am EDT Sep 20, 2026
Forecast Valid:
9am EDT Sep 20, 2026-6pm EDT Sep 26, 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