18.09
fri
fri
Day
75°F
S 11 mph
Precip.
2%
2%
Night
61°F
S 9 mph
Precip.
6%
6%
19.09
sat
sat
Day
59°F
SW 9 mph
Precip.
5%
5%
Night
52°F
N 5 mph
Precip.
16%
16%
20.09
sun
sun
Day
57°F
N 4 mph
Precip.
41%
41%
Night
59°F
W 7 mph
Precip.
82%
82%
21.09
mon
mon
Day
59°F
SW 14 mph
Precip.
24%
24%
Night
61°F
W 12 mph
Precip.
13%
13%
22.09
tue
tue
Day
52°F
SW 14 mph
Precip.
75%
75%
Night
55°F
W 12 mph
Precip.
13%
13%
23.09
wed
wed
Day
61°F
W 14 mph
Precip.
14%
14%
Night
55°F
SW 9 mph
Precip.
17%
17%
24.09
thu
thu
Day
61°F
SW 11 mph
Precip.
6%
6%
Night
54°F
NW 6 mph
Precip.
11%
11%
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 66.0°F. The highest and lowest sea temperatures during the month were 68.7°F and 63.7°F.
Sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 58.8°F. The highest and lowest sea temperatures during the month were 64.6°F and 54.1°F.
Air temperature in Boston, °F
Precipitation total in Boston, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Boston
Boston on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Boston
Local time: 06:58
September 18, friday
0900
70°F
SE
11 mph
11 mph
1200
75°F
S
11 mph
11 mph
1500
75°F
S
11 mph
11 mph
1800
72°F
SE
9 mph
9 mph
2100
66°F
SE
9 mph
9 mph
September 19, saturday
0000
61°F
S
9 mph
9 mph
0300
57°F
S
5 mph
5 mph
0600
55°F
S
8 mph
8 mph
