Pennington County weather, town by town
13 places in Pennington County, South Dakota, 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 1909 to 2026. Station extremes, not official state records.
Pennington County Weather Facts
Pennington County has 13 places on myweatherrock (6 census-designated places, 4 towns, 3 cities), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 117°F at Cottonwood 2 E on July 16, 2006. The coldest night is -43°F at Cottonwood 2 E on February 9, 1994. The wettest day brought 7.16 inches of rain at Pactola Dam on June 10, 1972. The biggest single-day snow measured 35 inches at Pactola Dam on October 5, 2013. Those are station measurements from NOAA's daily records, 1909 to 2026, not official state records. By area the largest place is Rapid, about 56 square miles.
About Pennington County weather
The map on the Now tab shows every Pennington 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 12 Pennington 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 13°F. May is the wettest, with rain on about 12 days. July afternoons run from about 78°F in Johnson Siding to 90°F in Quinn. January nights run from about 8°F in Quinn to 19°F in Keystone.
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.
Pennington County weather records
Measured at the NOAA stations serving these towns, daily records 1909 to 2026. Station extremes, not official state records.
Common questions about Pennington County weather
- What is the hottest temperature recorded at a Pennington County station?
- 117°F at Cottonwood 2 E on July 16, 2006, in the NOAA daily station records myweatherrock holds (1909 to 2026).
- What is the coldest temperature recorded at a Pennington County station?
- -43°F at Cottonwood 2 E on February 9, 1994.
- What is the most rain a Pennington County station has measured in one day?
- 7.16 inches at Pactola Dam on June 10, 1972.
- What is the biggest one-day snowfall at a Pennington County station?
- 35 inches at Pactola Dam on October 5, 2013.
- How many Pennington County towns have a weather page here?
- 13: 6 census-designated places, 4 towns, 3 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 Pennington 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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