Saint Charles, Missouri Climate by Month
Saint Charles, Missouri, United States
Hot summers and cold winters, with rain spread through the year.
Saint Charles has hot summers and cold winters, with rain spread through the year. Expect highs of 89°F (32°C) in July and 40°F (5°C) in January, with the coldest nights (January) near 22°F (-6°C). About 40 in (1010 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 89°F(32°C)
- Average high, July
- Coldest nights
- 22°F(-6°C)
- Average low, January
- Rain per year
- 40 in(1010 mm)
- No clear rainy season
- Humidity
- 68%
- Sunniest: July
Best and worst months in Saint Charles
Best for weatherThe most comfortable weather comes in May, September and October, with highs around 77°F (25°C) and about 3.7 in (94 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 40°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)
Saint Charles weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 40°F(5°C) | 22°F(-6°C) | 2.1 in(53 mm) | 68% | 1.8 |
| FebFebruary | 46°F(8°C) | 26°F(-3°C) | 2.1 in(54 mm) | 71% | 2.7 |
| MarMarch | 56°F(14°C) | 35°F(2°C) | 3.3 in(84 mm) | 67% | 3.8 |
| AprApril | 68°F(20°C) | 45°F(7°C) | 3.9 in(99 mm) | 64% | 4.8 |
| MayMayBest | 78°F(26°C) | 56°F(13°C) | 4.7 in(119 mm) | 67% | 5.4 |
| JunJune | 86°F(30°C) | 65°F(18°C) | 3.9 in(98 mm) | 67% | 6.1 |
| JulJuly | 89°F(32°C) | 68°F(20°C) | 4.2 in(106 mm) | 68% | 6.1 |
| AugAugust | 88°F(31°C) | 67°F(19°C) | 3.3 in(83 mm) | 69% | 5.5 |
| SepSeptemberBest | 82°F(28°C) | 58°F(14°C) | 3.5 in(88 mm) | 64% | 4.7 |
| OctOctoberBest | 70°F(21°C) | 46°F(8°C) | 3.0 in(76 mm) | 67% | 3.3 |
| NovNovember | 56°F(13°C) | 35°F(2°C) | 3.3 in(84 mm) | 68% | 2.1 |
| DecDecember | 44°F(7°C) | 26°F(-3°C) | 2.6 in(66 mm) | 72% | 1.6 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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