St. Louis, Missouri, United States climate

Average temperatures, precipitation and all-time records for St. Louis, Missouri, United States, with every day graded against ~46 years of local climate history (1980–2026). Its warmest month is July, averaging a high of 89°F, and its coldest is January, with an average low of 25°F.

St. Louis is an independent city in the U.S. state of Missouri. It lies near the confluence of the Mississippi and the Missouri rivers. In 2020, the city proper had a population of 301,578, while its metropolitan area, which extends into Illinois, had an estimated population of over 2.8 million. via Wikipedia

St. Louis average temperatures by month

Typical daily high and low, and average precipitation, for each month in St. Louis, Missouri, United States, based on 1980–2026 records. The wettest month is May (0.20 in on an average day).

Month	Avg high	Avg low	Avg precip
January	40°F	25°F	0.10 in
February	46°F	29°F	0.10 in
March	58°F	38°F	0.10 in
April	68°F	48°F	0.10 in
May	77°F	58°F	0.20 in
June	86°F	68°F	0.10 in
July	89°F	72°F	0.10 in
August	87°F	69°F	0.10 in
September	81°F	61°F	0.10 in
October	69°F	49°F	0.10 in
November	56°F	39°F	0.10 in
December	44°F	30°F	0.10 in

Jan 9°–56°

Feb 15°–64°

Mar 26°–74°

Apr 36°–81°

May 47°–86°

Jun 60°–93°

Jul 65°–96°

Aug 61°–95°

Sep 52°–90°

Oct 38°–81°

Nov 27°–70°

Dec 15°–58°

Each bar spans the 10th-percentile daily low to the 90th-percentile daily high (the range most days fall within), coloured cold → hot on a shared -10°F to 115°F scale, so the whole year's rhythm reads at a glance.

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Record extremes

Hottest day on record: 106°F on 2012-06-28
Coldest day on record: -15°F on 1989-12-22

All St. Louis weather records →

Percentiles compare each day to St. Louis, Missouri, United States's own history, so grades are relative to this location: a “Near Record” day here isn't the same temperature as elsewhere. How the grades work →