Saint Charles, Maryland Climate by Month
Saint Charles, Maryland, 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 87°F (31°C) in July and 45°F (7°C) in January, with the coldest nights (January) near 27°F (-3°C). About 44 in (1111 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 87°F(31°C)
- Average high, July
- Coldest nights
- 27°F(-3°C)
- Average low, January
- Rain per year
- 44 in(1111 mm)
- No clear rainy season
- Humidity
- 66%
- Sunniest: June
Best and worst months in Saint Charles
Best for weatherMay is the best time for weather in Saint Charles: highs near 76°F (24°C) and about 3.7 in (94 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 45°F (7°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 May.
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 | 45°F(7°C) | 27°F(-3°C) | 3.0 in(77 mm) | 70% | 2.0 |
| FebFebruary | 48°F(9°C) | 29°F(-2°C) | 2.7 in(68 mm) | 64% | 2.9 |
| MarMarch | 57°F(14°C) | 35°F(2°C) | 3.6 in(92 mm) | 57% | 3.8 |
| AprApril | 68°F(20°C) | 44°F(7°C) | 3.4 in(87 mm) | 58% | 4.8 |
| MayMayBest | 76°F(24°C) | 54°F(12°C) | 3.7 in(94 mm) | 66% | 5.5 |
| JunJune | 83°F(29°C) | 63°F(17°C) | 4.3 in(108 mm) | 68% | 5.7 |
| JulJuly | 87°F(31°C) | 68°F(20°C) | 4.1 in(105 mm) | 68% | 5.7 |
| AugAugust | 86°F(30°C) | 66°F(19°C) | 4.6 in(116 mm) | 72% | 5.2 |
| SepSeptember | 80°F(26°C) | 59°F(15°C) | 4.2 in(107 mm) | 73% | 4.2 |
| OctOctober | 69°F(21°C) | 48°F(9°C) | 3.5 in(90 mm) | 72% | 3.1 |
| NovNovember | 58°F(15°C) | 38°F(3°C) | 3.0 in(77 mm) | 62% | 2.3 |
| DecDecember | 49°F(9°C) | 31°F(-1°C) | 3.5 in(90 mm) | 60% | 1.8 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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