Chester County weather, town by town
44 places in Chester County, Pennsylvania, each with its own live forecast and radar, and where a station sits close enough, measured weather records.
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Measured at the NOAA stations serving these towns, daily records 1893 to 2026. Station extremes, not official state records.
Chester County Weather Facts
Chester County has 44 places on myweatherrock (28 census-designated places, 15 boroughs, 1 cities), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 111°F at Phoenixville 1 E on July 9, 1936. The coldest night is -19°F at Phoenixville 1 E on January 22, 1961. The wettest day brought 9.23 inches of rain at Phoenixville 1 E on October 1, 2010. The biggest single-day snow measured 25.98 inches at Glenmoore on January 8, 1996. Those are station measurements from NOAA's daily records, 1893 to 2026, not official state records. By area the largest place is Phoenixville, about 4 square miles.
About Chester County weather
The map on the Now tab shows every Chester County town's current temperature from our own server, one dot per town. Tap any dot, or type a town above, for that town's full forecast.
What the weather is usually like
Across the 44 Chester County towns with station normals, the warmest month is July, when the day usually reaches 85°F, and the coldest is January, when the night usually falls to 23°F. May is the wettest, with rain on about 11 days. July afternoons run from about 84°F in Avondale to 87°F in Berwyn. January nights run from about 21°F in Lincoln University to 26°F in Chadds Ford.
Means of the 1991 to 2020 station normals serving these towns, as published by NOAA; each town's page carries its own.
Where these numbers come from
- Current conditions and forecast: NOAA forecast grids decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
- Records: computed by myweatherrock from NOAA GHCN-Daily station records at the stations serving these towns. Measurements, not estimates.
- Warnings and alerts: the National Weather Service, passed through unchanged.
Chester County weather records
Measured at the NOAA stations serving these towns, daily records 1893 to 2026. Station extremes, not official state records.
Common questions about Chester County weather
- What is the hottest temperature recorded at a Chester County station?
- 111°F at Phoenixville 1 E on July 9, 1936, in the NOAA daily station records myweatherrock holds (1893 to 2026).
- What is the coldest temperature recorded at a Chester County station?
- -19°F at Phoenixville 1 E on January 22, 1961.
- What is the most rain a Chester County station has measured in one day?
- 9.23 inches at Phoenixville 1 E on October 1, 2010.
- What is the biggest one-day snowfall at a Chester County station?
- 25.98 inches at Glenmoore on January 8, 1996.
- How many Chester County towns have a weather page here?
- 44: 28 census-designated places, 15 boroughs, 1 cities. Each page carries current conditions, the hourly timeline, the ten day outlook, radar, and where a station sits close enough, measured records.
- Where does the Chester County forecast come from?
- NOAA forecast grids (the National Weather Service digital forecast, the National Blend of Models, HRRR and GFS) decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
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