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

Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Current conditions at

Pottstown, Pottstown Limerick Airport (KPTW)

Lat: 40.24°NLon: 75.55°WElev: 288ft.

Overcast

75°F

24°C

Humidity 84%
Wind Speed SW 5 mph
Barometer 29.99 in (1015.1 mb)
Dewpoint 70°F (21°C)
Visibility NA
Last update 17 Aug 8:54 am EDT
Extended Forecast for

Harleysville PA

  • Today

    Today: Mostly sunny, with a high near 91. West wind 5 to 10 mph.

    High: 91 °F

    Mostly Sunny

  • Tonight

    Tonight: A chance of showers and thunderstorms before 2am, then a slight chance of showers. Mostly cloudy, with a low around 66. Southwest wind 5 to 10 mph becoming north after midnight. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 66 °F

    Chance
    T-storms

  • Monday

    Monday: A chance of showers, mainly after 2pm. Mostly cloudy, with a high near 73. Northeast wind 10 to 15 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    High: 73 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers. Mostly cloudy, with a low around 62. East wind 5 to 10 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 62 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 5pm. Mostly cloudy, with a high near 74. East wind around 10 mph. Chance of precipitation is 30%.

    High: 74 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, mainly after 8pm. Mostly cloudy, with a low around 62. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 62 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A chance of thunderstorms before 8am, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 79. Chance of precipitation is 40%.

    High: 79 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Chance of precipitation is 40%.

    Low: 61 °F

    Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: A chance of showers after 2pm. Mostly sunny, with a high near 81. Chance of precipitation is 30%.

    High: 81 °F

    Mostly Sunny
    then Chance
    Showers

Detailed Forecast

Today
Mostly sunny, with a high near 91. West wind 5 to 10 mph.
Tonight
A chance of showers and thunderstorms before 2am, then a slight chance of showers. Mostly cloudy, with a low around 66. Southwest wind 5 to 10 mph becoming north after midnight. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
A chance of showers, mainly after 2pm. Mostly cloudy, with a high near 73. Northeast wind 10 to 15 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Monday Night
A chance of showers. Mostly cloudy, with a low around 62. East wind 5 to 10 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
A chance of showers, with thunderstorms also possible after 5pm. Mostly cloudy, with a high near 74. East wind around 10 mph. Chance of precipitation is 30%.
Tuesday Night
A chance of showers and thunderstorms, mainly after 8pm. Mostly cloudy, with a low around 62. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
A chance of thunderstorms before 8am, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 79. Chance of precipitation is 40%.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Chance of precipitation is 40%.
Thursday
A chance of showers after 2pm. Mostly sunny, with a high near 81. Chance of precipitation is 30%.
Thursday Night
A chance of showers before 8pm. Partly cloudy, with a low around 61. Chance of precipitation is 30%.
Friday
Mostly sunny, with a high near 83.
Friday Night
Mostly clear, with a low around 62.
Saturday
Mostly sunny, with a high near 83.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Harleysville PA
 40.27°N 75.39°W (Elev. 299 ft)
Last Update:
4:22 am EDT Aug 17, 2025
Forecast Valid:
9am EDT Aug 17, 2025-6pm EDT Aug 23, 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