Dorchester, Massachusetts Climate by Month
Dorchester, Massachusetts, United States
Warm summers and cold winters, with rain spread through the year.
Dorchester has warm summers and cold winters, with rain spread through the year. Afternoon highs range from 37°F (3°C) in January to 84°F (29°C) in July, and January nights average 20°F (-6°C). About 46 in (1173 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 84°F(29°C)
- Average high, July
- Coldest nights
- 20°F(-6°C)
- Average low, January
- Rain per year
- 46 in(1173 mm)
- No clear rainy season
- Humidity
- 68%
- Sunniest: July
Best and worst months in Dorchester
Best for weatherThe most comfortable weather comes in September, with highs around 76°F (24°C) and about 3.6 in (92 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 37°F (3°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)
Dorchester weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 37°F(3°C) | 20°F(-6°C) | 3.8 in(96 mm) | 74% | 1.7 |
| FebFebruary | 40°F(4°C) | 22°F(-6°C) | 3.3 in(83 mm) | 69% | 2.6 |
| MarMarch | 47°F(8°C) | 29°F(-2°C) | 4.6 in(118 mm) | 65% | 3.5 |
| AprApril | 58°F(15°C) | 38°F(3°C) | 3.9 in(100 mm) | 61% | 4.5 |
| MayMay | 69°F(21°C) | 48°F(9°C) | 3.2 in(82 mm) | 59% | 5.1 |
| JunJune | 78°F(26°C) | 57°F(14°C) | 3.7 in(95 mm) | 65% | 5.5 |
| JulJuly | 84°F(29°C) | 64°F(18°C) | 3.5 in(88 mm) | 66% | 5.6 |
| AugAugust | 83°F(28°C) | 63°F(17°C) | 3.7 in(93 mm) | 69% | 5.1 |
| SepSeptemberBest | 76°F(24°C) | 55°F(13°C) | 3.6 in(92 mm) | 71% | 4.0 |
| OctOctober | 64°F(18°C) | 44°F(6°C) | 4.5 in(114 mm) | 71% | 2.7 |
| NovNovember | 53°F(12°C) | 35°F(2°C) | 4.0 in(101 mm) | 72% | 1.8 |
| DecDecember | 43°F(6°C) | 26°F(-3°C) | 4.4 in(111 mm) | 74% | 1.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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