Potomac Climate by Month
Potomac, Maryland, United States
Hot summers and cold winters, with rain spread through the year.
Hot summers and cold winters, with rain spread through the year: that's Potomac's climate in short. Afternoon highs range from 44°F (6°C) in January to 88°F (31°C) in July, and January nights average 26°F (-3°C). It gets 43 in (1083 mm) of rain a year, spread across the months.
- Warmest month
- 88°F(31°C)
- Average high, July
- Coldest nights
- 26°F(-3°C)
- Average low, January
- Rain per year
- 43 in(1083 mm)
- No clear rainy season
- Humidity
- 65%
- Sunniest: June
Best and worst months in Potomac
Best for weatherThe most comfortable weather comes in May, with highs around 76°F (24°C) and about 4.0 in (102 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 44°F (6°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)
Potomac weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 44°F(6°C) | 26°F(-3°C) | 2.8 in(70 mm) | 59% | 1.9 |
| FebFebruary | 47°F(8°C) | 27°F(-3°C) | 2.6 in(66 mm) | 68% | 2.9 |
| MarMarch | 55°F(13°C) | 34°F(1°C) | 3.6 in(92 mm) | 60% | 3.8 |
| AprApril | 67°F(20°C) | 43°F(6°C) | 3.3 in(84 mm) | 60% | 4.8 |
| MayMayBest | 76°F(24°C) | 53°F(11°C) | 4.0 in(102 mm) | 64% | 5.5 |
| JunJune | 83°F(29°C) | 62°F(16°C) | 4.1 in(104 mm) | 70% | 5.8 |
| JulJuly | 88°F(31°C) | 66°F(19°C) | 4.1 in(104 mm) | 66% | 5.8 |
| AugAugust | 86°F(30°C) | 65°F(18°C) | 4.1 in(104 mm) | 70% | 5.2 |
| SepSeptember | 79°F(26°C) | 58°F(14°C) | 4.3 in(109 mm) | 71% | 4.2 |
| OctOctober | 68°F(20°C) | 46°F(8°C) | 3.4 in(86 mm) | 69% | 3.1 |
| NovNovember | 57°F(14°C) | 37°F(3°C) | 3.0 in(76 mm) | 64% | 2.2 |
| DecDecember | 47°F(9°C) | 30°F(-1°C) | 3.4 in(86 mm) | 63% | 1.8 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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