Current sea water temperature:
+50.7°F
| Minimum sea water temperature in May: | 63.1°F |
| Maximum sea water temperature in May: | 43.7°F |
| Average sea water temperature in May: | 52.0°F |
| more information | |
14 days
forecast
forecast
| Boston |
monthly
weather
weather
| Boston |
Sea water temperature for the last 10 days:
| May 16 | 50.7°F | May 11 | 51.1°F |
| May 15 | 51.6°F | May 10 | 50.7°F |
| May 14 | 51.8°F | May 9 | 51.8°F |
| May 13 | 52.2°F | May 8 | 53.2°F |
| May 12 | 52.0°F | May 7 | 51.4°F |
Monthly sea water temperature, °F
When is the warmest sea in Boston?
Based on the data about daily sea water temperature for the last three years the warmest sea in Boston was noticed in August, July and September.
Monthly Sea Temperatures in Boston, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 67.2°F. The highest and lowest sea temperatures during the month were 70.5°F and 64.9°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 67.1°F. The highest and lowest sea temperatures during the month were 70.0°F and 63.7°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 63.7°F. The highest and lowest sea temperatures during the month were 66.7°F and 60.1°F.
current
weather
weather
| Boston |
weather in
May
May
| Boston |
Best time for vacation in Boston
Boston on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Boston
Local time: 19:05
May 16, saturday
2100
66°F
NE
12 mph
12 mph
May 17, sunday
0000
63°F
NE
13 mph
13 mph
0300
61°F
NE
11 mph
11 mph
0600
61°F
NE
7 mph
7 mph
0900
70°F
E
9 mph
9 mph
1200
79°F
E
11 mph
11 mph
1500
81°F
E
11 mph
11 mph
1800
77°F
E
11 mph
11 mph
