Climate averages 1991–2020
St. Louis weather
in March.
A cool, wet month: the 8th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
March is a cool month in St. Louis: daytime highs average 13.0°C and nights cool to about 2.6°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 94 mm of rain on roughly 11 days, which makes March a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 56 min on an average March day.
The nearest other city in this atlas is O'Fallon (48 km away). In March its highs average 12.6°C, about as warm as St. Louis, with 92 mm of rain.
Among the 498 cities listed in the United States, St. Louis ranks joint 289th of 498 for the warmest March highs and joint 318th of 498 for the driest March (rainfall, lowest first). The mean March high of those 498 cities is 14.9°C; St. Louis is 1.9°C cooler than that mean.
From March to April, average highs rise by 6.2°C to 19.1°C, and monthly rainfall rises from 94 mm to 117 mm.
The annual picture
March in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
St. Louis climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.3°C-4.3°C | -4.3°C | 70 | 8.2 | 9.810 h |
| February | 7.2°C-2.5°C | -2.5°C | 63 | 7.8 | 10.711 h |
| March, selected | 13.0°C2.6°C | 2.6°C | 94 | 10.5 | 11.912 h |
| April | 19.1°C8.4°C | 8.4°C | 117 | 11.2 | 13.213 h |
| May | 24.3°C14.3°C | 14.3°C | 128 | 13.4 | 14.314 h |
| June | 29.1°C19.3°C | 19.3°C | 106 | 11.0 | 14.815 h |
| July | 31.0°C21.6°C | 21.6°C | 86 | 9.9 | 14.615 h |
| August | 30.4°C20.9°C | 20.9°C | 74 | 9.1 | 13.714 h |
| September | 26.4°C16.6°C | 16.6°C | 83 | 7.6 | 12.512 h |
| October | 19.9°C10.3°C | 10.3°C | 87 | 8.4 | 11.211 h |
| November | 12.3°C3.6°C | 3.6°C | 93 | 8.6 | 10.110 h |
| December | 6.3°C-1.7°C | -1.7°C | 65 | 8.2 | 9.510 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
March in nearby cities
- O'Fallon in MarchUnited States · 48 kmHigh 12.6°C · Low 2.6°C · 92 mm rain
- Springfield (Illinois), United States in MarchUnited States · 139 kmHigh 10.9°C · Low 0.8°C · 80 mm rain
- Decatur in MarchUnited States · 172 kmHigh 10.7°C · Low 0.7°C · 83 mm rain
- Columbia (Missouri), United States in MarchUnited States · 189 kmHigh 12.6°C · Low 2.4°C · 86 mm rain
- Bloomington (Illinois), United States in MarchUnited States · 231 kmHigh 9.8°C · Low -0.3°C · 78 mm rain
- Peoria (Illinois), United States in MarchUnited States · 236 kmHigh 9.9°C · Low 0.1°C · 75 mm rain
- Champaign in MarchUnited States · 236 kmHigh 10.2°C · Low 0.0°C · 85 mm rain
- Evansville in MarchUnited States · 242 kmHigh 13.3°C · Low 3.6°C · 111 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for St. Louis) is explained once on the St. Louis year overview and on the Sources, method and limits page.