Is this weather normal in Custer County?

Idaho · county records since 1895, through September 2026.

Weather › Idaho › Custer County

Custer County has warmed about 0.5° per decade since 1970. September 2026 averaged 50.6° there, right at the usual for September (51st warmest of 132).

This week

Usual for Oct 28 to Nov 3: highs near 44°, lows near 22°

That is the 1991 to 2020 average for these dates in Custer County. The Weather Service forecast fills in below.

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usual high for the datewarmercooler

The last 12 months

Oct: -0.9°OctNov: +6.6°NovDec: +8.5°DecJan 2026: +3.3°JanFeb: +4.6°FebMar: +6.8°MarApr: -0.1°AprMay: +2.7°MayJun: +0.4°JunJul: +4.4°JulAug: +2.9°AugSep: -0.7°Sepwarmercooler

Each bar is a month's average temperature against the usual for that month (1991 to 2020). Ranks compare the same month in every year since 1895.

Every year since 1895

18952025

Rain and drought

Oct: +0.8 inOctNov: -0.7 inNovDec: +3.0 inDecJan 2026: -1.0 inJanFeb: -0.1 inFebMar: -1.1 inMarApr: +0.6 inAprMay: -1.6 inMayJun: +0.4 inJunJul: +0.6 inJulAug: +0.1 inAugSep: +0.6 inSepwetterdrier

Rain and melted snow against the usual for each month. The drought reading is NOAA's Palmer index for the county.

Month by month in Custer County

MonthUsual high / lowUsual rainWarmestColdest
January30° / 10°2.3 in29.3° 19530.9° 1949
February34° / 12°1.9 in32.0° 19639.6° 1933
March42° / 18°2.3 in36.5° 202615.8° 1917
April48° / 24°2.1 in43.6° 191527.5° 1975
May57° / 32°2.2 in50.8° 189737.7° 1916
June66° / 38°1.9 in59.8° 202145.5° 1908
July77° / 45°0.8 in66.2° 200750.7° 1993
August76° / 44°0.8 in63.4° 202252.6° 1918
September66° / 37°1.3 in56.1° 199042.8° 1965
October52° / 28°1.8 in47.1° 198831.5° 2019
November37° / 17°2.0 in33.9° 202518.7° 1985
December29° / 10°2.6 in31.1° 19179.8° 1983

Warmest and coldest are the month's whole-month average temperature, with the year it happened.

Towns in Custer County

Nearby counties