Block Island surfForecast / Rhode Island / USA

information circle48hr Weather and Surf, issued 1 pm Thursday 21 May 2026 EDT
Forecast update in hr  min  s Forecast update imminent
Block Island surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Block Island sea temperature is
11.6° C
(Which is normal for this time of year)

How big are the waves at Block Island today?

The current surf forecast for Block Island at 8PM is: 0.7m 6s primary swell from a South direction and 0.4m 9s secondary swell from a Southeast direction, 0.5m 4s secondary swell from a East direction (forecast issued at 01:00pm May 21). The wind direction is predicted to be onshore.

Time (EDT) & DateWave HeightWave Period
Morning (21 May)3ft (0.9m)6s
Afternoon (21 May)2.5ft (0.7m)6s
Evening (21 May)1.5ft (0.4m)9s

Table - waves today at Block Island. (Swell directed towards the surf break)


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Heavy rain (total 27mm), heaviest during Sun morning. Very mild (max 14°C on Thu afternoon, min 8°C on Sat afternoon). Winds increasing (light winds from the E on Thu night, near gales from the E by Sun morning).

Thu
21
Friday
22
Saturday
23
Sun
24
11 AM
2 PM
5 PM
8 PM
11 PM
2 AM
5 AM
8 AM
11 AM
2 PM
5 PM
8 PM
11 PM
2 AM
5 AM
8 AM
11 AM
2 PM
5 PM
8 PM
11 PM
2 AM
5 AM
8 AM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
0.8
SSW
6
0.7
SSW
6
0.7
SSW
6
0.7
S
6
0.4
SE
9
0.4
SE
9
0.5
S
6
0.5
S
6
1
ENE
4
1.1
E
5
1
E
5
1
E
5
0.8
E
4
0.3
SE
10
0.3
SE
10
0.8
ESE
6
1.1
ESE
4
1.1
ESE
5
1.4
SE
6
1.6
SE
7
1.8
SE
7
1.9
SE
8
2.1
SE
8
2.5
SE
8
Wave Graph
Metric surfscale
Energy kJ
53
40
40
39
29
27
18
16
43
61
50
45
26
19
16
38
42
66
139
247
363
447
623
795
Wind (km/h)
25
NE
20
ENE
15
SE
10
SE
10
E
10
ENE
20
NE
30
NE
25
ENE
25
E
25
ESE
25
ESE
20
ESE
15
ESE
15
ENE
25
ENE
25
E
25
ESE
25
SE
20
ESE
30
ESE
35
ESE
45
E
50
E
cross-off
cross-off
on
on
cross-on
cross
cross-off
cross-off
cross
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
High Tide
12:31PM0.84m
00:51AM0.91m
1:36PM0.84m
1:55AM0.83m
2:43PM0.85m
3:00AM0.77m
Low Tide
6:36PM0.06m
7:49AM0.02m
8:01PM0.11m
8:48AM0.04m
9:15PM0.13m
part cloud
cloud
cloud
cloud
cloud
cloud
part cloud
part cloud
clear
part cloud
part cloud
cloud
cloud
cloud
cloud
cloud
cloud
cloud
light rain
light rain
light rain
light rain
light rain
mod rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:22
5:20
5:20
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:02
8:04
8:04
8:05
3
3
3
2
2
6
Temp °C
16
14
13
12
12
13
13
11
12
13
12
12
11
11
11
11
12
10
8
8
9
10
10
9
11
10
9
10
10
10
9
4
6
7
5
5
6
7
6
5
6
4
3
3
3
3
1
-1
Swell 1
Height (m)
Direction
Period (s)
0.8
SSW
6
0.7
SSW
6
0.7
SSW
6
0.7
S
6
0.6
S
6
0.6
S
6
0.5
S
6
0.5
S
6
0.4
SSW
6
0.3
S
6
0.3
SE
9
0.3
SE
10
0.3
SE
10
0.3
SE
10
0.3
SE
10
0.3
SE
10
0.1
SE
10
0.1
SE
10
0.1
S
6
0.1
S
6
0.1
S
12
0.1
S
18
Energy kJ
53
40
40
39
28
27
18
16
10
7
14
14
14
14
14
14
4
4
1
1
3
6
Swell 2
Height (m)
Direction
Period (s)
0.4
SE
9
0.4
SE
9
0.4
SE
9
0.4
SE
9
0.5
E
4
0.4
SE
9
0.3
SE
9
0.3
SE
9
0.3
SE
9
0.3
SE
9
0.3
SSE
6
0.2
S
7
0.2
S
7
0.2
S
7
0.2
S
7
0.1
SE
13
0.1
SE
13
0.1
SE
13
0.1
S
13
Energy kJ
29
27
29
29
8
21
13
13
13
13
8
3
3
4
4
7
7
7
3
Swell 3
Height (m)
Direction
Period (s)
0.1
SE
14
0.1
SE
14
0.1
SE
14
0.1
S
15
0.4
SE
9
0.1
SE
14
0.2
SSW
6
0.1
SE
13
0.2
SSE
7
0.2
SSW
6
0.1
SW
6
0.1
SE
13
0.1
SE
13
0.1
SE
13
0.1
SE
13
0.1
SE
8
0.1
SE
13
Energy kJ
8
8
8
4
29
7
3
7
5
3
1
7
7
7
7
2
7
Wind waves
Height (m)
Direction
Period (s)
0.5
NE
3
0.6
ENE
4
0.5
ENE
4
0.5
E
4
0.4
E
4
0.4
E
4
0.7
ENE
4
1
ENE
4
1.1
E
5
1
E
5
1
E
5
0.8
E
4
0.7
ESE
4
0.7
ESE
4
0.8
ESE
6
1.1
ESE
4
1.1
ESE
5
1.4
SE
6
1.6
SE
7
1.8
SE
7
1.9
SE
8
2.1
SE
8
2.5
SE
8
Energy kJ
5
10
9
8
5
5
13
43
61
50
45
26
19
16
38
42
66
139
247
363
447
623
795
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
1
1
2
1
1
1
1
2
2
1
1
1
1
2
1
3
4
Distance (km)
24
25
156
59
152
163
705
680
702
743
2565
2565
749
645
615
588
588
1095
1095
24
25
588
482
374
Best forecast wave conditions in Rhode Island
Rating
(10 max)
1
1
1
2
Best forecast wave conditions in United States
Rating
(10 max)
1
1
1
1
1
2
2
2
2
2
1
2
2
2
2
2
2
1
1
1
2
2
3
4
Header Global
Rating
(10 max)
5
5
5
4
5
7
7
7
6
6
6
5
6
7
8
8
7
6
5
5
5
5
6
6
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

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