Verdict: Excellent month
Boston Weather in May
May hits the sweet spot in Boston — highs around 20°C (68°F), ideal for a full day on foot. Expect showers on roughly 10 days of the month — rarely trip-ruining, worth planning around. Overall, May is one of the best months of the year to be in Boston.
Average high
20°C / 68°F
Average low
10°C / 50°F
Rain days
~10
Precipitation
87 mm
What to pack for Boston in May
- Layers — t-shirts under a light jacket or sweater
- A packable rain shell or compact umbrella earns its space
- Comfortable walking shoes — every guide on this site assumes you'll use them
May against the rest of the year
Warmest in Boston: Jul (29°C / 84°F) · Coolest: Jan (4°C / 39°F) · Wettest: Jul (~13 rain days)
4°
-4°
Jan
5°
-5°
Feb
9°
-1°
Mar
13°
4°
Apr
20°
10°
May
26°
15°
Jun
29°
19°
Jul
28°
18°
Aug
23°
14°
Sep
18°
9°
Oct
12°
3°
Nov
6°
-2°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)