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Surf Forecasts:
Thunders surfForecast / Mentawi Islands / Indonesia
48hr Weather and Surf, issued 12 am Wednesday 17 Sep 2025 WIB
How big are the waves at Thunders today?
The current surf forecast for Thunders at 5AM is: 2.1m 15s primary swell from a South-southwest direction and 0.5m 8s secondary swell from a West direction (forecast issued at 12:00am September 17). The wind direction is predicted to be glassy and the swell rating is 4.
| Time (WIB) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Sep) | 6.5ft (2.0m) | 15s |
| Afternoon (17 Sep) | 6.5ft (2.0m) | 15s |
| Evening (17 Sep) | 5.5ft (1.7m) | 14s |
Table - waves today at Thunders. (Swell directed towards the surf break)
Wednesday 17 | Thursday 18 | Friday 19 | ||||||||||||||||||||||
| 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 | 4 PM | 7 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |  |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 16 | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 12 | 13 | 14 | 15 | 12 | 12 | 13 | 17 | 14 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 1613 | 1690 | 1924 | 1898 | 1602 | 1413 | 1591 | 1187 | 1171 | 1154 | 989 | 1233 | 1172 | 1018 | 1018 | 657 | 956 | 631 | 372 | 617 | 544 | 737 | 377 | 780 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | glass | glass | glass | on | glass | cross- on | cross- on | cross- on | cross- on | cross- on | glass | glass | glass | cross- on | cross- off | cross- off | glass | glass | glass | cross- off | cross- off | glass |
High Tide / height (m) | 2:00AM 0.79 | 3:20PM 0.45 | 3:21AM 0.81 | 4:21PM 0.55 | 4:18AM 0.85 | 5:02PM 0.65 | ||||||||||||||||||
Low Tide / height (m) | 9:53AM 0.22 | 8:16PM 0.30 | 10:39AM 0.17 | 9:48PM 0.26 | 11:11AM 0.13 | |||||||||||||||||||
Wednesday 17 | Thursday 18 | Friday 19 | ||||||||||||||||||||||
| Sunrise | - | - | - | 6:11 | - | - | - | - | - | - | - | 6:09 | - | - | - | - | - | - | - | 6:09 | - | - | - | - |
| Sunset | - | - | - | - | - | - | 6:15 | - | - | - | - | - | - | - | 6:15 | - | - | - | - | - | - | - | 6:15 | - |
 | |  |  |  | | |  | | | | | | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | 1 | 4 | 5 | 2 | 4 | 2 | 2 | 4 | 3 | 1 | 4 | 5 | 1 | 1 | - | 1 | 2 | - | - | - |
| Temp. °C | 25 | 25 | 25 | 25 | 27 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 26 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 27 | 28 | 28 | 27 |
| Feels °C (?) | 28 | 29 | 29 | 29 | 31 | 30 | 30 | 29 | 27 | 28 | 28 | 28 | 30 | 31 | 31 | 29 | 29 | 29 | 30 | 30 | 31 | 31 | 31 | 31 |
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Mentawi Islands
Continuing clean conditions at Thunders (calm at MiaPadang 253 km from Thunders). 1.2m 11s groundswell from the S with a 0.7m 11s groundswell from the SSE and a 0.3m 11s groundswell from the WSW. 3 swells combining to make bigger set waves.
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