Is this weather normal in St. Mary's County?

Maryland · county records since 1895, through September 2026.

Weather › Maryland › St. Mary's County

St. Mary's County is in severe drought: NOAA's Palmer reading for September was -3.5. The last 12 months brought 33.5 inches of rain and snow there, 74% of the usual 45.3.

This week

Usual for Oct 28 to Nov 3: highs near 64°, lows near 44°

That is the 1991 to 2020 average for these dates in St. Mary's County. The Weather Service forecast fills in below.

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usual high for the datewarmercooler

The last 12 months

Oct: -0.3°OctNov: -0.3°NovDec: -3.7°DecJan 2026: -4.0°JanFeb: -3.4°FebMar: +4.7°MarApr: +3.5°AprMay: -0.8°MayJun: +1.3°JunJul: +1.3°JulAug: +2.2°AugSep: +2.7°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: -2.3 inOctNov: -1.8 inNovDec: -1.3 inDecJan 2026: -0.2 inJanFeb: -0.3 inFebMar: -2.4 inMarApr: -2.4 inAprMay: -1.4 inMayJun: -1.6 inJunJul: +1.0 inJulAug: +1.3 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 St. Mary's County

MonthUsual high / lowUsual rainWarmestColdest
January46° / 27°3.1 in47.4° 195023.6° 1977
February48° / 29°2.7 in45.9° 197625.0° 1934
March56° / 36°3.9 in55.5° 192134.1° 1960
April67° / 45°3.3 in61.7° 201747.7° 1907
May75° / 55°3.8 in70.8° 201858.1° 1967
June83° / 64°4.2 in78.7° 201065.9° 1907
July88° / 69°4.5 in82.0° 201273.3° 1962
August86° / 67°4.6 in80.6° 190070.3° 1927
September80° / 61°4.4 in76.0° 201864.1° 1917
October69° / 49°4.0 in65.7° 200752.4° 1907
November59° / 39°3.2 in54.5° 198540.9° 1901
December49° / 32°3.6 in51.3° 201527.4° 1989

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

Towns in St. Mary's County

Nearby counties