St. Louis, MO Weather
St. Louis hourly forecast: next 24 hours
Today's high of 98°F (37°C) is about 13°F (7°C) above the typical August high of 85°F (30°C).
Current conditions in detail
St. Louis weather tomorrow (Friday, August 14)
Tomorrow in St. Louis looks sunny, with a high of 102° and an overnight low of 75°. There is a 57% chance of rain - plan accordingly. Winds top out near 9 mph, and the UV index reaches 8 (very high).
St. Louis 14-day forecast
About the weather in 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.
St. Louis weather: 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.
Season by season
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.
Average temperatures in St. Louis by month
| 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% |