Weather in Boston: May
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Average day temperature: | 64.4°F |
| Average night temperature: | 53.1°F | |
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Sea water temperature: | 52.0°F |
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Number of sunny days: | 11 days |
| Day length: | 14.1 - 15.1 hours | |
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Number of rainy days: | 4 days |
| Precipitation totals: | 2.3 in. | |
| more information | ||
14 days
forecast
forecast
| Boston |
sea water
temperature
temperature
| Boston |
Air temperature in May, °F
Show year:
2025
2024
2023
The highest day temperature during May of 2025 was 80°F. At the same time the lowest night temperature was 42°F. Daily and nightly averages during May were 62.4°F and 52.6°F.
Sea water temperature in Boston in May, °F
Show year:
2025
2024
2023
The average sea water temperature in May of 2025 was 53.0°F. The highest and lowest sea temperatures during the month were 56.8°F and 48.4°F.
Sunny, partly cloudy and cloudy days
Number of sunny, partly cloudy and cloudy days in May is almost equal.
Precipitation total in May, in.
Precipitation total value in Boston in May is 2.6 in. Other months of the year show relatively similar values.
Wind speed in May, mph
The average wind speed value in May is 8.4 mph
Average sunny hours
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in May is: 7.8.
Best time for vacation in Boston
Boston on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Boston
Local time: 05:18
December 14, sunday
0600
25°F
SE
5 mph
5 mph
0900
28°F
SE
7 mph
7 mph
1200
32°F
SE
7 mph
7 mph
1500
30°F
SE
9 mph
9 mph
1800
28°F
SE
12 mph
12 mph
2100
23°F
SE
14 mph
14 mph
December 15, monday
0000
19°F
SE
16 mph
16 mph
0300
18°F
SE
14 mph
14 mph
