St. Louis, MO Climate & Monthly Averages
The climate of St. Louis
St. Louis has a humid subtropical climate, marked by hot, humid summers and generally mild winters. Average daytime highs range from about 41°F (5°C) in January to around 88°F (31°C) in July, and the city records roughly 126 days of measurable precipitation a year.
Climate quick facts
- Hottest month: July - highs near 88°F (31°C)
- Coldest month: January - highs near 41°F (5°C)
- Record high: 104°F (40°C) · Record low: -7°F (-22°C) (2015–2024)
- Wettest month: July (13 rainy days) · Sunniest: July (11.8 h sun/day)
- Climate type: humid subtropical - hot, humid summers and generally mild winters
- Snow: about 8 days a year
Temperatures through the year
The warmest stretch of the year centers on July. Highs average 88°F (31°C) and overnight lows stay near 71°F (22°C). The coolest month is January, with typical highs of 41°F (5°C) and lows around 25°F (-4°C). Based on 2015–2024 weather data, temperatures have reached as high as 104°F (40°C) and dropped as low as -7°F (-22°C).
Rain, sun and snow
July is usually the wettest month. It brings about 6.9 inches (174 mm) of rain over 13 days, while February is the driest. July brings the most sunshine, averaging 11.8 hours of sun a day. Snow falls on about 8 days in a typical year, mostly from November through March.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 41° | 25° | 9 | 3.2 in | 5.7 h/day | 69% |
| February | 46° | 27° | 8 | 2.7 in | 7.1 h/day | 66% |
| March | 57° | 38° | 13 | 5.5 in | 7.5 h/day | 67% |
| April | 66° | 46° | 11 | 5.0 in | 9.0 h/day | 65% |
| May | 76° | 58° | 14 | 5.4 in | 10.2 h/day | 71% |
| June | 86° | 67° | 11 | 4.5 in | 11.6 h/day | 68% |
| July | 88° | 71° | 13 | 6.9 in | 11.8 h/day | 73% |
| August | 85° | 69° | 13 | 5.4 in | 11.0 h/day | 74% |
| September | 82° | 63° | 8 | 4.7 in | 10.2 h/day | 69% |
| October | 69° | 51° | 9 | 3.6 in | 8.1 h/day | 67% |
| November | 55° | 38° | 9 | 3.3 in | 7.0 h/day | 69% |
| December | 47° | 31° | 8 | 3.2 in | 6.0 h/day | 71% |
St. Louis month by month
St. Louis weather in January
January brings highs around 41°F (5°C), lows near 25°F (-4°C), about 9 wet days and roughly 2 snowy days - typically the coldest month of the year in St. Louis.
St. Louis weather in February
February brings highs around 46°F (8°C), lows near 27°F (-3°C), about 8 wet days and roughly 3 snowy days - typically the driest month of the year in St. Louis.
St. Louis weather in March
March brings highs around 57°F (14°C), lows near 38°F (3°C), about 13 wet days.
St. Louis weather in April
April brings highs around 66°F (19°C), lows near 46°F (8°C), about 11 wet days.
St. Louis weather in May
May brings highs around 76°F (24°C), lows near 58°F (14°C), about 14 wet days.
St. Louis weather in June
June brings highs around 86°F (30°C), lows near 67°F (20°C), about 11 wet days.
St. Louis weather in July
July brings highs around 88°F (31°C), lows near 71°F (22°C), about 13 wet days - typically the hottest month and the wettest month and the sunniest month of the year in St. Louis.
St. Louis weather in August
August brings highs around 85°F (30°C), lows near 69°F (20°C), about 13 wet days.
St. Louis weather in September
September brings highs around 82°F (28°C), lows near 63°F (17°C), about 8 wet days.
St. Louis weather in October
October brings highs around 69°F (20°C), lows near 51°F (11°C), about 9 wet days.
St. Louis weather in November
November brings highs around 55°F (13°C), lows near 38°F (4°C), about 9 wet days.
St. Louis weather in December
December brings highs around 47°F (8°C), lows near 31°F (0°C), about 8 wet days and roughly 1 snowy days.
Seasons in St. Louis
Spring (March through May)
Spring in St. Louis is crisp but comfortable, with daytime highs averaging 66°F (19°C) and nights around 47°F (8°C); expect showers on roughly 39 days across the season.
Summer (June through August)
Summer in St. Louis brings hot afternoons, with daytime highs averaging 86°F (30°C) and nights around 69°F (20°C); expect showers on roughly 37 days across the season. With the humidity factored in, afternoons often feel hotter than the thermometer reads - run the numbers through the humidity and dew point converter to see why.
Fall (September through November)
Fall in St. Louis is pleasantly warm, with daytime highs averaging 69°F (20°C) and nights around 51°F (10°C); expect showers on roughly 26 days across the season.
Winter (December through February)
Winter in St. Louis runs cold, with daytime highs averaging 45°F (7°C) and nights around 28°F (-2°C); expect showers on roughly 25 days across the season, plus around 6 snowy days.
Climate questions, answered
What is the average temperature in St. Louis?
Is St. Louis hot in summer?
Is St. Louis cold in winter?
How many rainy days does St. Louis get in a year?
Best time to visit St. Louis
The best time to visit St. Louis is generally September to November and April, when warm days, manageable rainfall and plenty of daylight line up. Daytime temperatures in that window typically sit near 68°F (20°C).
Pack for St. Louis with lightweight, breathable clothing and strong sun protection for the hot months; a heavy insulated coat, hat and gloves for winter; a compact umbrella or rain shell - showers are a regular feature. Evenings can feel noticeably cooler than afternoons - July nights average 71°F (22°C).
St. Louis temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.