Hamlin County weather, town by town
9 places in Hamlin 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 1893 to 2026. Station extremes, not official state records.
Hamlin County Weather Facts
Hamlin County has 9 places on myweatherrock (4 cities, 3 census-designated places, 2 towns), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 111°F at De Smet on July 21, 1934. The coldest night is -44°F at De Smet on January 12, 1912. The wettest day brought 4.55 inches of rain at Clear Lake on June 16, 1992. The biggest single-day snow measured 17.99 inches at Clear Lake on December 22, 1968. Those are station measurements from NOAA's daily records, 1893 to 2026, not official state records. By area the largest place is Lake Poinsett, about 5 square miles.
About Hamlin County weather
The map on the Now tab shows every Hamlin 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 9 Hamlin County towns with station normals, the warmest month is July, when the day usually reaches 82°F, and the coldest is January, when the night usually falls to 4°F. May is the wettest, with rain on about 11 days. January nights run from about 3°F in Castlewood to 6°F in Bryant.
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.
Hamlin 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 Hamlin County weather
- What is the hottest temperature recorded at a Hamlin County station?
- 111°F at De Smet on July 21, 1934, in the NOAA daily station records myweatherrock holds (1893 to 2026).
- What is the coldest temperature recorded at a Hamlin County station?
- -44°F at De Smet on January 12, 1912.
- What is the most rain a Hamlin County station has measured in one day?
- 4.55 inches at Clear Lake on June 16, 1992.
- What is the biggest one-day snowfall at a Hamlin County station?
- 17.99 inches at Clear Lake on December 22, 1968.
- How many Hamlin County towns have a weather page here?
- 9: 4 cities, 3 census-designated places, 2 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 Hamlin 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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