13.08
thu
thu
Day
84°F
E 8 mph
Precip.
6%
6%
Night
68°F
SE 8 mph
Precip.
6%
6%
14.08
fri
fri
Day
79°F
SE 8 mph
Precip.
1%
1%
Night
66°F
SE 11 mph
Precip.
61%
61%
15.08
sat
sat
Day
75°F
E 2 mph
Precip.
2%
2%
Night
68°F
NE 7 mph
Precip.
10%
10%
16.08
sun
sun
Day
75°F
N 14 mph
Precip.
16%
16%
Night
73°F
NE 16 mph
Precip.
68%
68%
17.08
mon
mon
Day
81°F
SE 7 mph
Precip.
5%
5%
Night
66°F
SW 9 mph
Precip.
7%
7%
18.08
tue
tue
Day
75°F
NW 3 mph
Precip.
3%
3%
Night
68°F
NE 6 mph
Precip.
14%
14%
19.08
wed
wed
Day
77°F
N 9 mph
Precip.
12%
12%
Night
72°F
NE 11 mph
Precip.
26%
26%
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 70.3°F. The highest and lowest sea temperatures during the month were 74.1°F and 68.7°F.
Air temperature in Groton, °F
Precipitation total in Groton, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Groton
Groton on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Groton
Local time: 10:45
August 13, thursday
1200
84°F
E
8 mph
8 mph
1500
88°F
E
11 mph
11 mph
1800
81°F
SE
10 mph
10 mph
2100
72°F
SE
9 mph
9 mph
August 14, friday
0000
68°F
SE
8 mph
8 mph
0300
64°F
S
7 mph
7 mph
0600
64°F
SE
7 mph
7 mph
0900
72°F
SE
9 mph
9 mph
