21.07
tue
tue
Day
75°F
NW 12 mph
Precip.
23%
23%
Night
70°F
N 9 mph
Precip.
59%
59%
22.07
wed
wed
Day
77°F
NE 11 mph
Precip.
52%
52%
Night
66°F
S 11 mph
Precip.
13%
13%
23.07
thu
thu
Day
72°F
SE 11 mph
Precip.
1%
1%
Night
63°F
S 5 mph
Precip.
5%
5%
24.07
fri
fri
Day
73°F
NE 5 mph
Precip.
2%
2%
Night
64°F
NW 4 mph
Precip.
8%
8%
25.07
sat
sat
Day
75°F
W 11 mph
Precip.
2%
2%
Night
64°F
NE 4 mph
Precip.
9%
9%
26.07
sun
sun
Day
75°F
N 6 mph
Precip.
3%
3%
Night
64°F
NE 6 mph
Precip.
9%
9%
27.07
mon
mon
Day
79°F
NE 12 mph
Precip.
5%
5%
Night
68°F
NE 6 mph
Precip.
92%
92%
Sea water temperature in July, °F
Show year:
2026
2025
2024
The average sea water temperature in July of 2026 was 68.1°F. The highest and lowest sea temperatures during the month were 70.9°F and 65.5°F.
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: 09:24
July 21, tuesday
1200
75°F
NW
12 mph
12 mph
1500
75°F
NW
14 mph
14 mph
1800
72°F
NW
13 mph
13 mph
2100
72°F
N
11 mph
11 mph
July 22, wednesday
0000
70°F
N
9 mph
9 mph
0300
70°F
NE
10 mph
10 mph
0600
70°F
NE
10 mph
10 mph
0900
73°F
NE
10 mph
10 mph
