Missouri has hot summers and cold winters: NOAA's 1991–2020 normals for St. Louis Lambert International Airport give highs of 88.3–89.6°F in July and August and 40.4°F in January, with 5.7 inches of snow in January and May the wettest month at 4.82 inches. Kansas City runs a little colder and drier in winter. Choose by activity; we have no verified dataset for crowds, events or prices.
Month-by-month climate table
| Month | Normal high | Normal low | Normal precipitation | Normal snowfall | Verified notes |
|---|---|---|---|---|---|
| January | 40.4°F | 23.8°F | 2.59 in | 5.7 in | — |
| February | 45.8°F | 27.6°F | 2.23 in | 4.3 in | — |
| March | 56.6°F | 36.7°F | 3.50 in | 2.3 in | — |
| April | 68.0°F | 47.0°F | 4.73 in | 0.2 in | — |
| May | 77.1°F | 57.9°F | 4.82 in | 0.0 in | — |
| June | 85.9°F | 67.2°F | 4.49 in | 0.0 in | — |
| July | 89.6°F | 71.1°F | 3.93 in | 0.0 in | — |
| August | 88.3°F | 69.3°F | 3.38 in | 0.0 in | — |
| September | 81.1°F | 60.9°F | 2.96 in | 0.0 in | — |
| October | 69.2°F | 49.1°F | 3.15 in | 0.0 in | Oct 27 is an NPS fee-free day (2026) |
| November | 55.5°F | 37.4°F | 3.42 in | 0.9 in | — |
| December | 44.5°F | 28.5°F | 2.50 in | 3.2 in | — |
Source: NOAA NCEI U.S. Climate Normals 1991–2020, St. Louis Lambert International Airport (USW00013994), retrieved October 20, 2026. Normals are 30-year averages; actual weather varies. The note is from the Gateway Arch's 2026 fee-free-day listing (via a search summary).
St. Louis vs Kansas City
| Station | January high / low | July high / low | Wettest month | Peak snowfall |
|---|---|---|---|---|
| St. Louis Lambert | 40.4°F / 23.8°F | 89.6°F / 71.1°F | May (4.82 in) | 5.7 in (January) |
| Kansas City Intl | 38.4°F / 19.5°F | 88.3°F / 68.1°F | May (5.32 in) | 5.9 in (February) |
How to choose your month
- Warmest: June–August (St. Louis highs 85.9–89.6°F).
- Coldest: December–February (St. Louis highs 40.4–45.8°F).
- Wettest: May (4.82 inches) and April (4.73) at St. Louis.
Limits of this guide
Normals describe typical conditions, not forecasts, and we have no verified dataset for storm risk, event dates, crowds or prices by month, so this page makes no such claims. Use the National Weather Service for forecasts.