Dewey County weather, town by town
9 places in Dewey 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 1911 to 2026. Station extremes, not official state records.
Dewey County Weather Facts
Dewey County has 9 places on myweatherrock (6 census-designated places, 2 cities, 1 towns), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 116°F at Onida 4 Nw on July 15, 2006. The coldest night is -46°F at Timber Lake on January 12, 1912. The wettest day brought 6.21 inches of rain at Onida 4 Nw on August 2, 1953. The biggest single-day snow measured 27.99 inches at Dupree 15 Sse on April 12, 1991. Those are station measurements from NOAA's daily records, 1911 to 2026, not official state records. By area the largest place is La Plant, about 9 square miles.
About Dewey County weather
The map on the Now tab shows every Dewey 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 8 Dewey County towns with station normals, the warmest month is July, when the day usually reaches 86°F, and the coldest is January, when the night usually falls to 8°F. June is the wettest, with rain on about 10 days. July afternoons run from about 85°F in Isabel to 88°F in Green Grass. January nights run from about 6°F in Swift Bird to 9°F in Eagle Butte.
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.
Dewey County weather records
Measured at the NOAA stations serving these towns, daily records 1911 to 2026. Station extremes, not official state records.
Common questions about Dewey County weather
- What is the hottest temperature recorded at a Dewey County station?
- 116°F at Onida 4 Nw on July 15, 2006, in the NOAA daily station records myweatherrock holds (1911 to 2026).
- What is the coldest temperature recorded at a Dewey County station?
- -46°F at Timber Lake on January 12, 1912.
- What is the most rain a Dewey County station has measured in one day?
- 6.21 inches at Onida 4 Nw on August 2, 1953.
- What is the biggest one-day snowfall at a Dewey County station?
- 27.99 inches at Dupree 15 Sse on April 12, 1991.
- How many Dewey County towns have a weather page here?
- 9: 6 census-designated places, 2 cities, 1 towns. 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 Dewey 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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