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

76°F

24°C

Humidity 77%
Wind Speed SW 12 mph
Barometer 29.93 in (1013.4 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index77°F (25°C)
Last update 20 Sep 1:54 pm EDT
Extended Forecast for

Swarthmore PA

  • This Afternoon

    This Afternoon: A chance of rain, then rain likely and possibly a thunderstorm after 5pm. Mostly cloudy, with a high near 76. South wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 76 °F

    Rain Likely

  • Tonight

    Tonight: Rain likely and possibly a thunderstorm before 9pm, then a chance of rain and thunderstorms between 9pm and 11pm. Mostly cloudy, with a low around 62. Southwest wind around 5 mph becoming north after midnight. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 62 °F

    Rain Likely
    then Mostly
    Cloudy

  • Monday

    Monday: A chance of showers, mainly after 4pm. Increasing clouds, with a high near 70. Northeast wind around 10 mph. Chance of precipitation is 30%.

    High: 70 °F

    Partly Sunny
    then Chance
    Showers

  • Monday Night

    Monday Night: Showers likely, mainly after 2am. Cloudy, with a low around 56. Northeast wind 5 to 10 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 56 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Showers likely, mainly before 2pm. Mostly cloudy, with a high near 64. Northeast wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

    High: 64 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A chance of showers. Cloudy, with a low around 53. Chance of precipitation is 40%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 53 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers before 2pm. Mostly cloudy, with a high near 64. Chance of precipitation is 30%.

    High: 64 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers after 2am. Mostly cloudy, with a low around 54. Chance of precipitation is 30%.

    Low: 54 °F

    Mostly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: A chance of showers. Mostly cloudy, with a high near 64. Chance of precipitation is 30%.

    High: 64 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
A chance of rain, then rain likely and possibly a thunderstorm after 5pm. Mostly cloudy, with a high near 76. South wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
Rain likely and possibly a thunderstorm before 9pm, then a chance of rain and thunderstorms between 9pm and 11pm. Mostly cloudy, with a low around 62. Southwest wind around 5 mph becoming north after midnight. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
A chance of showers, mainly after 4pm. Increasing clouds, with a high near 70. Northeast wind around 10 mph. Chance of precipitation is 30%.
Monday Night
Showers likely, mainly after 2am. Cloudy, with a low around 56. 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 64. Northeast wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday Night
A chance of showers. Cloudy, with a low around 53. 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 64. Chance of precipitation is 30%.
Wednesday Night
A chance of showers after 2am. Mostly cloudy, with a low around 54. Chance of precipitation is 30%.
Thursday
A chance of showers. Mostly cloudy, with a high near 64. Chance of precipitation is 30%.
Thursday Night
A chance of showers after 2am. Mostly cloudy, with a low around 52. Chance of precipitation is 30%.
Friday
A chance of showers. Partly sunny, with a high near 65. Chance of precipitation is 30%.
Friday Night
Mostly cloudy, with a low around 53.
Saturday
Partly sunny, with a high near 68.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Swarthmore PA
 39.91°N 75.34°W (Elev. 197 ft)
Last Update:
4:09 am EDT Sep 20, 2026
Forecast Valid:
2pm 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