Is this weather normal in Day County?

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

Weather › South Dakota › Day County

10 of the last 12 months ran warmer than usual in Day County. Day County has warmed about 0.4° per decade since 1970.

This week

Usual for Oct 28 to Nov 3: highs near 47°, lows near 28°

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

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usual high for the datewarmercooler

The last 12 months

Oct: +6.3°OctNov: +4.8°NovDec: -1.2°DecJan 2026: +0.5°JanFeb: +8.3°FebMar: +3.7°MarApr: -1.5°AprMay: +0.2°MayJun: +0.4°JunJul: +3.7°JulAug: +0.3°AugSep: +4.2°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: -1.5 inOctNov: +0.3 inNovDec: +0.2 inDecJan 2026: -0.3 inJanFeb: +0.1 inFebMar: -0.4 inMarApr: +0.3 inAprMay: -1.1 inMayJun: -1.7 inJunJul: +2.9 inJulAug: -1.4 inAugSep: +0.5 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 Day County

MonthUsual high / lowUsual rainWarmestColdest
January20° / 2°0.6 in24.1° 2006-5.8° 1912
February25° / 6°0.6 in29.5° 1954-10.6° 1936
March38° / 19°1.0 in42.6° 201211.1° 1899
April53° / 31°2.0 in51.1° 191531.6° 2013
May66° / 44°3.1 in66.6° 193445.6° 1907
June76° / 55°3.9 in74.6° 193358.3° 1969
July81° / 60°3.7 in81.1° 193662.0° 1992
August79° / 57°2.5 in75.0° 198362.4° 1897
September71° / 48°2.4 in66.1° 202447.3° 1965
October56° / 35°2.2 in55.4° 196332.4° 1925
November39° / 21°0.7 in40.9° 20019.6° 1896
December25° / 9°0.7 in29.0° 2023-2.7° 1983

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

Towns in Day County

Nearby counties