Custer County weather, town by town
5 places in Custer County, Idaho, 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 1908 to 2026. Station extremes, not official state records.
Custer County Weather Facts
Custer County has 5 places on myweatherrock (5 cities), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 104°F at Mackay Lost Rvr Rs on July 27, 1939. The coldest night is -54°F at Stanley on December 23, 1983. The wettest day brought 2.6 inches of rain at Smiley Mountain on August 8, 2017. The biggest single-day snow measured 25 inches at Mackay Lost Rvr Rs on December 27, 1936. Those are station measurements from NOAA's daily records, 1908 to 2026, not official state records. By area the largest place is Lost River, about 8 square miles.
About Custer County weather
The map on the Now tab shows every Custer 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 5 Custer County towns with station normals, the warmest month is July, when the day usually reaches 78°F, and the coldest is December, when the night usually falls to 8°F. May is the wettest, with rain on about 10 days. July afternoons run from about 69°F in Clayton to 88°F in Challis. December nights run from about 0°F in Stanley to 11°F in Clayton.
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.
Custer County weather records
Measured at the NOAA stations serving these towns, daily records 1908 to 2026. Station extremes, not official state records.
Common questions about Custer County weather
- What is the hottest temperature recorded at a Custer County station?
- 104°F at Mackay Lost Rvr Rs on July 27, 1939, in the NOAA daily station records myweatherrock holds (1908 to 2026).
- What is the coldest temperature recorded at a Custer County station?
- -54°F at Stanley on December 23, 1983.
- What is the most rain a Custer County station has measured in one day?
- 2.6 inches at Smiley Mountain on August 8, 2017.
- What is the biggest one-day snowfall at a Custer County station?
- 25 inches at Mackay Lost Rvr Rs on December 27, 1936.
- How many Custer County towns have a weather page here?
- 5: 5 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 Custer 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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