Princeton, New Jersey Climate by Month
Princeton, New Jersey, 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 Princeton's climate in short. July is the warmest month, with highs around 87°F (30°C); January is the coolest at 40°F (5°C), and nights dip to 23°F (-5°C). It gets 47 in (1199 mm) of rain a year, spread across the months.
- Warmest month
- 87°F(30°C)
- Average high, July
- Coldest nights
- 23°F(-5°C)
- Average low, January
- Rain per year
- 47 in(1199 mm)
- No clear rainy season
- Humidity
- 66%
- Sunniest: July
Best and worst months in Princeton
Best for weatherThe most comfortable weather comes in May and September, with highs around 76°F (24°C) and about 4.0 in (101 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's 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 May.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Princeton weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 40°F(5°C) | 23°F(-5°C) | 3.5 in(90 mm) | 66% | 1.8 |
| FebFebruary | 43°F(6°C) | 24°F(-4°C) | 2.8 in(71 mm) | 62% | 2.8 |
| MarMarch | 51°F(11°C) | 31°F(0°C) | 4.1 in(105 mm) | 56% | 3.7 |
| AprApril | 63°F(17°C) | 41°F(5°C) | 3.6 in(92 mm) | 61% | 4.6 |
| MayMayBest | 73°F(23°C) | 50°F(10°C) | 3.7 in(93 mm) | 65% | 5.4 |
| JunJune | 82°F(28°C) | 59°F(15°C) | 4.7 in(119 mm) | 67% | 5.8 |
| JulJuly | 87°F(30°C) | 64°F(18°C) | 4.8 in(122 mm) | 66% | 5.8 |
| AugAugust | 85°F(29°C) | 63°F(17°C) | 4.3 in(110 mm) | 70% | 5.1 |
| SepSeptemberBest | 78°F(26°C) | 56°F(13°C) | 4.3 in(109 mm) | 71% | 4.1 |
| OctOctober | 67°F(19°C) | 44°F(7°C) | 3.9 in(100 mm) | 67% | 2.9 |
| NovNovember | 56°F(13°C) | 36°F(2°C) | 3.3 in(84 mm) | 67% | 2.0 |
| DecDecember | 45°F(7°C) | 28°F(-2°C) | 4.1 in(104 mm) | 68% | 1.6 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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