Thunders surfForecast / Mentawi Islands / Indonesia

information circle48hr Weather and Surf, issued 12 pm Monday 18 May 2026 WIB
Forecast update in hr  min  s Forecast update imminent
Thunders surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Thunders sea temperature is
30.3° C
(Which is slightly warmer than usual)

How big are the waves at Thunders today?

The current surf forecast for Thunders at 9PM is: 1.5m 14s primary swell from a South direction and 0.6m 8s secondary swell from a West direction (forecast issued at 12:00pm May 18). The wind direction is predicted to be onshore.

Time (WIB) & DateWave HeightWave Period
Morning (18 May)4.5ft (1.4m)15s
Afternoon (18 May)5ft (1.5m)14s
Evening (18 May)5ft (1.5m)14s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Light rain (total 9mm), mostly falling on Mon night. Warm (max 29°C on Mon morning, min 27°C on Mon night). Wind will be generally light.

Mon
18
Tuesday
19
Wednesday
20
Thu
21
10 AM
1 PM
4 PM
7 PM
10 PM
1 AM
4 AM
7 AM
10 AM
1 PM
4 PM
7 PM
10 PM
1 AM
4 AM
7 AM
10 AM
1 PM
4 PM
7 PM
10 PM
1 AM
4 AM
7 AM
Rating
(10 max)
2
2
2
3
3
3
3
3
4
3
2
4
4
4
4
3
3
3
2
2
2
3
3
2
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)
1.4
S
15
1.5
S
15
1.5
S
14
1.5
S
14
1.6
S
14
1.6
S
14
1.6
S
13
1.5
S
13
1.5
S
13
1.5
S
13
1.4
S
13
1.4
S
12
1.4
S
12
1
SW
16
1
SW
16
1
SW
16
1
SW
16
1.1
SW
16
1.1
SW
16
1.1
SW
15
1.1
SW
15
1.1
SW
15
1.2
SW
15
1.3
SW
15
Wave Graph
Metric surfscale
Energy kJ
892
1051
868
868
999
971
905
760
760
749
633
584
563
511
523
511
492
635
627
595
565
557
631
696
Wind (km/h)
15
SE
15
SSE
10
S
10
SSE
10
SSE
10
SSE
10
SE
5
SE
5
SE
5
SSW
5
SSW
5
SSW
0
S
5
NE
5
ENE
5
ENE
5
E
5
S
5
S
5
S
5
SE
5
ESE
5
ESE
5
ESE
cross-on
on
on
on
on
on
cross-on
cross-on
glassy
cross-on
cross-on
glassy
glassy
glassy
glassy
glassy
glassy
on
on
on
cross-on
glassy
glassy
cross
High Tide
7:11PM0.61m
7:28AM1.15m
8:00PM0.58m
8:17AM1.10m
8:53PM0.56m
Low Tide
1:30PM-0.03m
00:36AM0.02m
2:20PM-0.01m
1:21AM0.05m
3:11PM0.03m
2:10AM0.11m
part cloud
part cloud
clear
part cloud
clear
thunderstorm
thunderstorm
thunderstorm
thunderstorm
part cloud
thunderstorm
clear
thunderstorm
thunderstorm
part cloud
clear
part cloud
part cloud
thunderstorm
clear
clear
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:16
6:16
6:16
6:16
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:14
6:14
6:14
6:14
1
2
1
1
1
1
1
1
Temp °C
29
29
29
28
28
27
27
27
28
29
29
28
28
27
27
27
28
29
29
28
28
27
27
27
32
32
32
32
32
31
31
32
33
34
33
32
34
32
32
32
32
33
33
32
32
31
32
32
Swell 1
Height (m)
Direction
Period (s)
1.4
S
15
1.5
S
15
1.5
S
14
1.5
S
14
1.6
S
14
1.6
S
14
1.6
S
13
1.5
S
13
1.5
S
13
1.5
S
13
1.4
S
13
1.4
S
12
1.4
S
12
1.3
S
12
1.3
S
12
1.2
S
12
1.2
S
12
1.2
S
12
1.2
S
10
1.2
S
11
1.1
SW
15
1.1
SW
15
1.2
SW
15
1.3
SW
15
Energy kJ
892
1051
868
868
999
971
905
760
760
749
633
584
563
477
469
400
400
387
308
326
565
557
631
696
Swell 2
Height (m)
Direction
Period (s)
0.7
W
9
0.6
W
9
0.6
W
9
0.6
W
8
0.6
W
8
0.8
SW
18
0.8
SW
18
0.7
SW
18
0.7
SW
18
0.7
SW
16
0.8
SW
16
0.9
SW
16
1
SW
16
1
SW
16
1
SW
16
1
SW
16
1
SW
16
1.1
SW
16
1.1
SW
16
1.1
SW
15
0.9
S
9
1.1
S
11
1.1
S
11
1
S
11
Energy kJ
76
56
55
52
51
375
370
304
300
260
310
432
498
511
523
511
492
635
627
595
133
284
279
227
Swell 3
Height (m)
Direction
Period (s)
0.5
S
8
0.6
SW
19
0.4
SW
19
0.4
SW
19
0.5
SW
18
0.5
W
8
0.5
W
8
0.5
W
8
0.5
W
8
0.4
WNW
8
0.4
WNW
8
0.4
WNW
8
0.4
WNW
8
0.4
WNW
8
0.3
WNW
8
0.3
WNW
8
0.3
WNW
8
0.3
WNW
8
0.3
WNW
8
0.3
WNW
8
0.7
S
11
0.3
WNW
7
0.2
WNW
7
0.2
WNW
7
Energy kJ
33
236
133
130
155
35
35
34
34
22
22
22
22
21
12
12
11
11
11
11
127
11
5
5
Wind waves
Height (m)
Direction
Period (s)
Energy kJ
Nearest Offshore or Glassy
Rating
(10 max)
3
4
3
4
4
4
4
4
4
3
4
4
4
4
4
3
3
3
3
3
3
3
3
3
Distance (km)
3
3
62
3
3
3
3
3
0
32
32
0
0
0
0
0
0
32
62
135
3
0
0
3
Best forecast wave conditions in Mentawi Islands
Rating
(10 max)
3
4
3
4
4
4
4
4
4
3
4
4
4
4
4
3
3
3
3
3
3
3
3
3
Best forecast wave conditions in Indonesia
Rating
(10 max)
4
4
4
4
4
4
4
4
4
3
4
4
4
4
4
4
3
3
4
3
4
3
3
4
Header Global
Rating
(10 max)
4
6
5
4
4
5
5
4
4
4
4
4
4
4
4
4
5
5
4
5
5
5
5
5
  • 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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