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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Hazardous Weather Conditions

Current conditions at

Pottstown, Pottstown Limerick Airport (KPTW)

Lat: 40.24°NLon: 75.55°WElev: 288ft.

Thunderstorm in Vicinity

68°F

20°C

Humidity 93%
Wind Speed NW 6 mph
Barometer 30.02 in (1016.2 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 27 Aug 10:54 pm EDT
Extended Forecast for

Collegeville PA

Flood Watch August 27, 11:09pm until August 28, 04:00am
Flood Warning until August 28, 01:15am
Click here for hazard details and duration
Flood Watch
Flood Warning
  •  
    Flood Watch August 27, 11:09pm until August 28, 04:00am
    Flood Warning until August 28, 01:15am

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Tonight

    Low: 67 °F

    Showers
    Likely

  • Friday

    Friday: Partly sunny, with a high near 84. Calm wind becoming north around 5 mph.

    High: 84 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 62. Calm wind.

    Low: 62 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 84. Calm wind becoming northeast around 5 mph.

    High: 84 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

Detailed Forecast

Tonight
Showers and thunderstorms likely before 2am, then a slight chance of showers between 2am and 3am. Mostly cloudy, with a low around 67. Calm wind. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
Partly sunny, with a high near 84. Calm wind becoming north around 5 mph.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 62. Calm wind.
Saturday
Sunny, with a high near 84. Calm wind becoming northeast around 5 mph.
Saturday Night
Mostly clear, with a low around 64. Calm wind.
Sunday
Mostly sunny, with a high near 87.
Sunday Night
Partly cloudy, with a low around 69.
Monday
Mostly sunny, with a high near 88.
Monday Night
Mostly cloudy, with a low around 70.
Tuesday
A chance of showers after 2pm. Partly sunny, with a high near 89. Chance of precipitation is 30%.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 70. Chance of precipitation is 40%.
Wednesday
A chance of showers. Partly sunny, with a high near 88. Chance of precipitation is 40%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 69. Chance of precipitation is 40%.
Thursday
A chance of showers. Partly sunny, with a high near 85. Chance of precipitation is 30%.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Collegeville PA
 40.19°N 75.46°W (Elev. 200 ft)
Last Update:
4:08 pm EDT Aug 27, 2026
Forecast Valid:
11pm EDT Aug 27, 2026-6pm EDT Sep 3, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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