What is the hottest month in St. Louis?

July — average highs around 89° with lows near 71°.

What is the coldest month in St. Louis?

January, when nights typically drop to 25° and days top out near 40°.

What is the rainiest month in St. Louis?

July, averaging about 6.8 in of precipitation; the driest is December at roughly 2.9 in.

How warm is St. Louis over the year?

The annual mean is 58°, with about 54 in of precipitation in a typical year (1991-2020 normals).

St. Louis Climate — Monthly Normals 1991-2020

Climate in St. Louis

The typical year in St. Louis (Missouri), from 1991-2020 normals. For what's happening now, see the current forecast; a month ahead — the 30-day outlook.

Annual mean temp

14.4°C

average across 12 months

Annual precipitation

1375 mm

yearly total

Warmest month

Jul

⌀ max 31°C

Coldest month

Jan

⌀ min -3°C

Temperatures by month

typical high (orange) · typical low (blue)

Jan

25° … 40°

Feb

28° … 47°

Mar

38° … 58°

Apr

46° … 67°

May

58° … 77°

Jun

67° … 87°

Jul

71° … 89°

Aug

69° … 86°

Sep

63° … 82°

Oct

51° … 69°

Nov

38° … 55°

Dec

32° … 48°

Precipitation by month

monthly totals across the year

Jan

88 mm

Feb

76 mm

Mar

141 mm

Apr

134 mm

May

144 mm

Jun

123 mm

Jul

173 mm

Aug

127 mm

Sep

121 mm

Oct

96 mm

Nov

78 mm

Dec

74 mm

The short version

RegionMissouri

Latitude38.6273°N

Annual mean14.4°C

Annual precipitation1375 mm

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Weather map — St. Louis

St. Louis →

Source · 1991-2020 normals

St. Louis, MO Climate