Westfield, New Jersey Climate by Month
Westfield, 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 Westfield's climate in short. July is the warmest month, with highs around 87°F (30°C); January is the coolest at 40°F (4°C), and nights dip to 23°F (-5°C). It gets 49 in (1243 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
- 49 in(1243 mm)
- No clear rainy season
- Humidity
- 66%
- Sunniest: July
Best and worst months in Westfield
Best for weatherThe most comfortable weather comes in May and September, with highs around 75°F (24°C) and about 4.2 in (107 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 40°F (4°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)
Westfield weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 40°F(4°C) | 23°F(-5°C) | 3.7 in(94 mm) | 67% | 1.8 |
| FebFebruary | 43°F(6°C) | 24°F(-4°C) | 2.9 in(74 mm) | 62% | 2.7 |
| MarMarch | 51°F(11°C) | 31°F(0°C) | 4.2 in(107 mm) | 57% | 3.7 |
| AprApril | 63°F(17°C) | 41°F(5°C) | 3.7 in(95 mm) | 61% | 4.6 |
| MayMayBest | 73°F(23°C) | 50°F(10°C) | 3.9 in(98 mm) | 65% | 5.3 |
| JunJune | 82°F(28°C) | 59°F(15°C) | 4.7 in(120 mm) | 67% | 5.7 |
| JulJuly | 87°F(30°C) | 65°F(18°C) | 5.1 in(129 mm) | 66% | 5.8 |
| AugAugust | 84°F(29°C) | 63°F(17°C) | 4.3 in(108 mm) | 70% | 5.0 |
| SepSeptemberBest | 78°F(26°C) | 56°F(13°C) | 4.5 in(115 mm) | 71% | 4.0 |
| OctOctober | 66°F(19°C) | 45°F(7°C) | 4.3 in(109 mm) | 67% | 2.8 |
| NovNovember | 55°F(13°C) | 36°F(2°C) | 3.5 in(90 mm) | 68% | 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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