St. Louis Climate by Month
St. Louis, Missouri, United States
Hot summers and cold winters, with rain spread through the year.
St. Louis has hot summers and cold winters, with rain spread through the year. July is the warmest month, with highs around 90°F (32°C); January is the coolest at 41°F (5°C), and nights dip to 23°F (-5°C). About 41 in (1031 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 90°F(32°C)
- Average high, July
- Coldest nights
- 23°F(-5°C)
- Average low, January
- Rain per year
- 41 in(1031 mm)
- No clear rainy season
- Humidity
- 66%
- Sunniest: June
Best and worst months in St. Louis
Best for weatherThe most comfortable weather comes in October, with highs around 71°F (22°C) and about 2.9 in (74 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 41°F (5°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in October.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
St. Louis weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 41°F(5°C) | 23°F(-5°C) | 2.3 in(58 mm) | 82% | 1.8 |
| FebFebruary | 46°F(8°C) | 27°F(-3°C) | 2.3 in(58 mm) | 68% | 2.7 |
| MarMarch | 57°F(14°C) | 36°F(2°C) | 3.4 in(86 mm) | 65% | 3.8 |
| AprApril | 69°F(21°C) | 46°F(8°C) | 3.9 in(99 mm) | 62% | 4.8 |
| MayMay | 79°F(26°C) | 57°F(14°C) | 4.7 in(120 mm) | 64% | 5.4 |
| JunJune | 87°F(31°C) | 67°F(19°C) | 4.0 in(101 mm) | 64% | 6.0 |
| JulJuly | 90°F(32°C) | 70°F(21°C) | 4.1 in(103 mm) | 66% | 6.0 |
| AugAugust | 89°F(32°C) | 68°F(20°C) | 3.3 in(83 mm) | 66% | 5.5 |
| SepSeptember | 83°F(28°C) | 59°F(15°C) | 3.7 in(93 mm) | 62% | 4.7 |
| OctOctoberBest | 71°F(22°C) | 47°F(9°C) | 2.9 in(74 mm) | 64% | 3.3 |
| NovNovember | 56°F(14°C) | 36°F(2°C) | 3.4 in(86 mm) | 65% | 2.1 |
| DecDecember | 45°F(7°C) | 28°F(-2°C) | 2.8 in(70 mm) | 69% | 1.6 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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