28.09
mon
mon
Day
63°F
SW 13 mph
Precip.
71%
71%
Night
55°F
SE 17 mph
Precip.
39%
39%
29.09
tue
tue
Day
63°F
E 9 mph
Precip.
14%
14%
Night
64°F
SW 4 mph
Precip.
28%
28%
30.09
wed
wed
Day
63°F
N 5 mph
Precip.
14%
14%
Night
64°F
NE 11 mph
Precip.
25%
25%
01.10
thu
thu
Day
66°F
NE 11 mph
Precip.
28%
28%
Night
64°F
NE 13 mph
Precip.
30%
30%
02.10
fri
fri
Day
66°F
NE 12 mph
Precip.
23%
23%
Night
59°F
SE 19 mph
Precip.
16%
16%
03.10
sat
sat
Day
57°F
S 12 mph
Precip.
5%
5%
Night
59°F
SW 5 mph
Precip.
2%
2%
04.10
sun
sun
Day
57°F
NW 14 mph
Precip.
6%
6%
Night
63°F
NW 25 mph
Precip.
36%
36%
sea water
temperature
temperature
| Block Island |
monthly
weather
weather
| Block Island |
current
weather
weather
| Block Island |
14 days
forecast
forecast
| Block Island |
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 68.2°F. The highest and lowest sea temperatures during the month were 70.3°F and 64.0°F.
Sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 64.4°F. The highest and lowest sea temperatures during the month were 68.2°F and 59.9°F.
Air temperature in Block Island, °F
Precipitation total in Block Island, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Block Island
Block Island on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Block Island
Local time: 14:22
September 28, monday
1500
63°F
S
16 mph
16 mph
1800
59°F
S
22 mph
22 mph
2100
57°F
S
20 mph
20 mph
September 29, tuesday
0000
55°F
SE
17 mph
17 mph
0300
55°F
SE
13 mph
13 mph
0600
57°F
SE
11 mph
11 mph
0900
57°F
SE
9 mph
9 mph
1200
63°F
E
9 mph
9 mph
