Wellesley Climate by Month
Wellesley, Massachusetts, United States
Warm summers and cold winters, with rain spread through the year.
The climate in Wellesley is one of warm summers and cold winters, with rain spread through the year. Afternoon highs range from 36°F (2°C) in January to 83°F (29°C) in July, and January nights average 18°F (-8°C). It gets 47 in (1193 mm) of rain a year, spread across the months.
- Warmest month
- 83°F(29°C)
- Average high, July
- Coldest nights
- 18°F(-8°C)
- Average low, January
- Rain per year
- 47 in(1193 mm)
- No clear rainy season
- Humidity
- 67%
- Sunniest: July
Best and worst months in Wellesley
Best for weatherJune and September are the best time for weather in Wellesley: highs near 76°F (24°C) and about 3.7 in (95 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)
Wellesley weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 36°F(2°C) | 18°F(-8°C) | 3.7 in(94 mm) | 80% | 1.7 |
| FebFebruary | 39°F(4°C) | 19°F(-7°C) | 3.2 in(82 mm) | 56% | 2.6 |
| MarMarch | 46°F(8°C) | 26°F(-3°C) | 4.6 in(117 mm) | 55% | 3.5 |
| AprApril | 58°F(14°C) | 36°F(2°C) | 4.0 in(102 mm) | 64% | 4.6 |
| MayMay | 69°F(20°C) | 46°F(8°C) | 3.3 in(83 mm) | 63% | 5.2 |
| JunJuneBest | 77°F(25°C) | 55°F(13°C) | 3.8 in(97 mm) | 69% | 5.6 |
| JulJuly | 83°F(29°C) | 61°F(16°C) | 3.8 in(96 mm) | 70% | 5.7 |
| AugAugust | 82°F(28°C) | 61°F(16°C) | 3.8 in(96 mm) | 72% | 5.2 |
| SepSeptemberBest | 75°F(24°C) | 53°F(12°C) | 3.6 in(92 mm) | 74% | 4.0 |
| OctOctober | 64°F(18°C) | 42°F(5°C) | 4.5 in(114 mm) | 74% | 2.6 |
| NovNovember | 53°F(11°C) | 33°F(1°C) | 4.1 in(105 mm) | 64% | 1.8 |
| DecDecember | 42°F(6°C) | 24°F(-4°C) | 4.5 in(115 mm) | 63% | 1.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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