Is this weather normal in Dewey County?

South Dakota · county records since 1895, through September 2026.

Weather › South Dakota › Dewey County

10 of the last 12 months ran warmer than usual in Dewey County. 3.2 inches fell in September, the 6th-most for a September there in 132 years.

This week

Usual for Oct 28 to Nov 3: highs near 51°, lows near 28°

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

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usual high for the datewarmercooler

The last 12 months

Oct: +4.6°OctNov: +3.5°NovDec: +2.9°DecJan 2026: +2.5°JanFeb: +11.1°FebMar: +7.1°MarApr: -1.0°AprMay: +1.3°MayJun: -0.8°JunJul: +5.2°JulAug: +0.7°AugSep: +4.0°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: +0.2 inNovDec: +0.0 inDecJan 2026: -0.2 inJanFeb: -0.3 inFebMar: -0.5 inMarApr: -0.0 inAprMay: -1.5 inMayJun: -0.8 inJunJul: -1.0 inJulAug: +0.0 inAugSep: +1.7 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 Dewey County

MonthUsual high / lowUsual rainWarmestColdest
January27° / 7°0.4 in31.6° 2006-4.8° 1937
February31° / 11°0.6 in37.1° 1954-8.0° 1936
March44° / 21°0.8 in46.5° 201210.9° 1899
April57° / 32°1.7 in52.9° 191535.6° 1920
May68° / 43°3.0 in68.6° 193447.8° 1907
June79° / 54°3.3 in76.7° 198858.8° 1945
July86° / 60°2.6 in86.0° 193664.4° 1992
August85° / 57°2.0 in78.4° 193765.2° 1992
September76° / 48°1.5 in69.3° 202448.7° 1965
October59° / 34°1.7 in57.3° 196335.6° 1925
November43° / 22°0.5 in41.7° 201610.9° 1896
December30° / 11°0.5 in30.5° 20230.3° 1927

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

Towns in Dewey County

Nearby counties