Union County weather, town by town
10 places in Union 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 1948 to 2026. Station extremes, not official state records.
Union County Weather Facts
Union County has 10 places on myweatherrock (6 census-designated places, 4 boroughs), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 105°F at Millheim on July 23, 2011. The coldest night is -20°F at Williamsport Rgnl Ap on January 21, 1994. The wettest day brought 8.66 inches of rain at Williamsport Rgnl Ap on June 22, 1972. The biggest single-day snow measured 25 inches at Millheim on March 14, 1993. Those are station measurements from NOAA's daily records, 1948 to 2026, not official state records. By area the largest place is Winfield, about 3 square miles.
About Union County weather
The map on the Now tab shows every Union 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 10 Union 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 19°F. May is the wettest, with rain on about 14 days. January nights run from about 16°F in Laurelton to 20°F in Allenwood.
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.
Union County weather records
Measured at the NOAA stations serving these towns, daily records 1948 to 2026. Station extremes, not official state records.
Common questions about Union County weather
- What is the hottest temperature recorded at a Union County station?
- 105°F at Millheim on July 23, 2011, in the NOAA daily station records myweatherrock holds (1948 to 2026).
- What is the coldest temperature recorded at a Union County station?
- -20°F at Williamsport Rgnl Ap on January 21, 1994.
- What is the most rain a Union County station has measured in one day?
- 8.66 inches at Williamsport Rgnl Ap on June 22, 1972.
- What is the biggest one-day snowfall at a Union County station?
- 25 inches at Millheim on March 14, 1993.
- How many Union County towns have a weather page here?
- 10: 6 census-designated places, 4 boroughs. 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 Union 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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