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St. Louis Weather by Month
Average temperatures, rainfall and humidity for St. Louis, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical St. Louis month looks like before you travel — then check the live St. Louis forecast for the days ahead.
Warmest month
July
31°C average high
Coolest month
January
-4°C average low
Wettest month
May
95 mm of rain
Driest month
February
32 mm of rain
Average temperature and rainfall in St. Louis by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 5°C | -4°C | -22°C / 21°C | 43 mm | 73% | 13 km/h |
| February | 8°C | -2°C | -21°C / 29°C | 32 mm | 70% | 14 km/h |
| March | 15°C | 4°C | -17°C / 34°C | 77 mm | 67% | 14 km/h |
| April | 20°C | 9°C | -4°C / 32°C | 86 mm | 65% | 14 km/h |
| May | 25°C | 15°C | 3°C / 34°C | 95 mm | 71% | 11 km/h |
| June | 30°C | 20°C | 10°C / 38°C | 67 mm | 70% | 10 km/h |
| July | 31°C | 21°C | 12°C / 39°C | 70 mm | 73% | 9 km/h |
| August | 30°C | 20°C | 11°C / 40°C | 73 mm | 75% | 9 km/h |
| September | 28°C | 17°C | 5°C / 38°C | 45 mm | 72% | 9 km/h |
| October | 21°C | 10°C | -5°C / 33°C | 65 mm | 70% | 12 km/h |
| November | 14°C | 3°C | -13°C / 28°C | 47 mm | 70% | 12 km/h |
| December | 9°C | 0°C | -21°C / 25°C | 53 mm | 74% | 12 km/h |
Best time to visit St. Louis
The most comfortable time to visit St. Louis is generally May and September to October, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around May, totalling about 751 mm a year.
Travellers who prefer heat should aim for July, when highs average 31°C. May is the month to avoid if rain would spoil your plans — it averages 95 mm, roughly 3× the rainfall of the driest month (February).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the St. Louis forecast for what is happening now.