Thunders surfForecast / Mentawi Islands / Indonesia

information circle48hr Weather and Surf, issued 6 pm Wednesday 20 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
30.2° C
(Which is slightly warmer than usual)

How big are the waves at Thunders today?

The current surf forecast for Thunders at 2AM is: 1.1m 15s primary swell from a Southwest direction and 1.1m 11s secondary swell from a South direction (forecast issued at 06:00pm May 20). The wind direction is predicted to be glassy and the swell rating is 3.

Time (WIB) & DateWave HeightWave Period
Morning (21 May)3.5ft (1.1m)15s
Afternoon (21 May)3.5ft (1.1m)15s
Evening (21 May)4ft (1.2m)16s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Heavy rain (total 55mm), heaviest during Wed night. Warm (max 29°C on Wed afternoon, min 25°C on Thu afternoon). Wind will be generally light.

Wed
20
Thursday
21
Friday
22
Sat
23
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
10 AM
1 PM
Rating
(10 max)
4
3
3
3
3
3
3
2
3
2
2
2
2
2
3
2
2
2
2
2
2
3
3
3
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)
1.1
SW
16
1.1
SW
15
1.1
SW
15
1.1
SW
15
1.2
SW
15
1.3
SW
15
1.1
SW
15
1.1
SW
15
1.1
SW
15
1.2
SW
16
1.3
SW
16
1.2
SW
15
1.2
SW
15
1.2
SW
15
1.3
SW
15
1.3
SW
15
1.3
SW
15
1.4
SW
15
1.4
SW
15
1.4
SW
15
1.3
SW
14
1.2
SW
14
1.2
SW
14
1.3
SSW
14
Wave Graph
Metric surfscale
Energy kJ
619
595
565
557
631
696
550
557
572
692
783
666
614
606
685
685
685
784
805
838
621
540
548
653
Wind (km/h)
5
SW
0
SSE
5
NE
5
NE
5
N
5
N
10
N
20
NNW
25
N
15
NNW
20
NW
15
NW
20
NNW
20
NNW
15
NW
20
WNW
20
WNW
25
WNW
20
NW
20
NW
15
NW
15
NW
10
NNW
10
NW
glassy
glassy
glassy
glassy
off
off
off
cross-off
off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
off
cross-off
High Tide
8:53PM0.56m
9:08AM1.02m
9:53PM0.55m
10:03AM0.93m
11:03PM0.56m
11:03AM0.84m
Low Tide
3:11PM0.03m
2:10AM0.11m
4:05PM0.08m
3:05AM0.18m
5:02PM0.14m
4:11AM0.27m
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
light rain
thunderstorm
thunderstorm
thunderstorm
clear
part cloud
part cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
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
6
3
2
1
5
4
5
2
1
2
3
2
1
2
3
3
2
3
2
Temp °C
29
28
27
27
27
27
27
28
26
25
26
26
26
27
28
29
29
27
27
26
27
26
27
28
34
34
32
32
31
31
31
30
27
27
28
28
28
29
30
30
31
28
28
28
29
29
31
31
Swell 1
Height (m)
Direction
Period (s)
1.2
S
12
1.1
S
11
1.1
SW
15
1.1
SW
15
1.2
SW
15
1.3
SW
15
1.1
SW
15
1.1
SW
15
1.1
SW
15
1.2
SW
16
1.3
SW
16
1.2
SW
15
1.2
SW
15
1.2
SW
15
1.3
SW
15
1.3
SW
15
1.3
SW
15
1.4
SW
15
1.4
SW
15
1.4
SW
15
1.3
SW
14
1.2
SW
14
1.2
SW
14
1.3
SSW
14
Energy kJ
383
274
565
557
631
696
550
557
572
692
783
666
614
606
685
685
685
784
805
838
621
540
548
653
Swell 2
Height (m)
Direction
Period (s)
1.1
SW
16
1.1
SW
15
0.9
S
9
1.1
S
11
1.1
S
11
1
S
11
1
S
11
1
S
10
0.9
S
10
0.9
S
10
0.9
S
9
0.8
S
9
0.7
S
10
0.6
S
10
0.5
S
10
0.5
S
10
0.7
S
9
0.6
S
9
0.6
S
8
0.5
S
8
0.5
S
8
1
W
8
1
W
7
1
WNW
7
Energy kJ
619
595
127
284
279
227
223
194
151
143
137
106
90
68
47
48
78
55
50
34
34
115
109
111
Swell 3
Height (m)
Direction
Period (s)
0.3
WNW
8
0.3
WNW
8
0.7
S
11
0.3
WNW
7
0.3
WNW
7
0.2
WNW
7
0.2
WNW
7
0.2
WNW
7
0.2
WNW
7
0.6
S
10
0.1
S
16
0.4
SE
9
0.4
NW
7
0.4
SSE
9
0.4
SSE
8
0.5
SSE
8
0.2
W
16
0.2
W
16
0.2
S
11
0.1
SE
8
0.1
SE
8
0.5
S
8
0.4
SSW
9
0.4
SSE
8
Energy kJ
11
11
125
11
11
5
5
5
5
71
5
21
12
31
28
40
20
20
9
3
3
34
26
21
Wind waves
Height (m)
Direction
Period (s)
0.4
NW
7
0.4
NW
7
0.4
NW
7
0.2
WNW
4
0.4
NW
7
0.6
WNW
4
0.8
WNW
6
0.9
WNW
6
0.8
WNW
6
0.8
WNW
6
0.9
WNW
5
0.9
WNW
7
0.4
NNW
4
0.4
NNW
3
0.7
N
4
Energy kJ
12
12
12
2
17
13
53
68
50
43
40
84
6
3
13
Nearest Offshore or Glassy
Rating
(10 max)
4
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
Distance (km)
0
0
0
0
0
0
0
162
0
31
84
84
84
84
0
84
84
84
84
84
84
0
0
0
Best forecast wave conditions in Mentawi Islands
Rating
(10 max)
4
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
Best forecast wave conditions in Indonesia
Rating
(10 max)
4
4
4
3
3
4
4
3
3
3
4
4
4
4
3
4
4
4
4
4
3
3
3
3
Header Global
Rating
(10 max)
4
4
4
5
5
5
5
5
5
5
5
5
4
5
5
7
7
7
6
5
5
5
5
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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