Williamsport Climate by Month
Williamsport, Pennsylvania, United States
Warm summers and freezing winters, with rain spread through the year.
Williamsport has warm summers and freezing winters, with rain spread through the year. July is the warmest month, with highs around 85°F (29°C); January is the coolest at 36°F (2°C), and nights dip to 19°F (-7°C). It gets 40 in (1021 mm) of rain a year, spread across the months.
- Warmest month
- 85°F(29°C)
- Average high, July
- Coldest nights
- 19°F(-7°C)
- Average low, January
- Rain per year
- 40 in(1021 mm)
- No clear rainy season
- Humidity
- 69%
- Sunniest: July
Best and worst months in Williamsport
Best for weatherThe most comfortable weather comes in May and September, with highs around 74°F (23°C) and about 3.9 in (100 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 36°F (2°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 September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Williamsport weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 36°F(2°C) | 19°F(-7°C) | 2.5 in(63 mm) | 79% | 1.6 |
| FebFebruary | 39°F(4°C) | 21°F(-6°C) | 2.3 in(58 mm) | 71% | 2.5 |
| MarMarch | 48°F(9°C) | 28°F(-2°C) | 3.1 in(78 mm) | 64% | 3.4 |
| AprApril | 61°F(16°C) | 38°F(3°C) | 3.4 in(87 mm) | 58% | 4.5 |
| MayMayBest | 73°F(23°C) | 48°F(9°C) | 3.6 in(91 mm) | 61% | 5.3 |
| JunJune | 81°F(27°C) | 57°F(14°C) | 4.3 in(110 mm) | 66% | 5.7 |
| JulJuly | 85°F(29°C) | 62°F(17°C) | 3.9 in(100 mm) | 68% | 5.7 |
| AugAugust | 83°F(28°C) | 60°F(16°C) | 3.4 in(87 mm) | 69% | 5.0 |
| SepSeptemberBest | 76°F(24°C) | 53°F(12°C) | 4.3 in(108 mm) | 73% | 4.0 |
| OctOctober | 63°F(17°C) | 42°F(5°C) | 3.5 in(89 mm) | 74% | 2.7 |
| NovNovember | 51°F(11°C) | 33°F(0°C) | 3.0 in(76 mm) | 67% | 1.8 |
| DecDecember | 40°F(4°C) | 25°F(-4°C) | 2.9 in(74 mm) | 80% | 1.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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