Thunders Surf Forecast

/ Mentawi Islands (22 surf breaks) /

Indonesia (163 surf breaks)

Surf Forecasts:

Thunders surfForecast / Mentawi Islands / Indonesia

12 Day Weather and Surf, issued 12 pm Saturday 23 Aug 2025 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 30.0° C
(Which is 1.3°C warmer than normal for this time of year)

Best Forecast Surf Conditions for Thunders this week:

The surf forecast for Thunders over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Aug 23) at 4PM. The primary swell is predicted to be 2.2m and 15s period with a secondary swell of 0.4m and 11s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Thunders in the next 12 days are 2.2m 15s and forecast to arrive on Saturday (Aug 23) at 4PM. Winds are predicted to be cross-offshore at the time the swell arrives.

Wave Type	Time (WIB) & Date	Wave Height & Period
Next good surf (1 star+)	4PM (Sat 23rd Aug)	7ft (2.2m) 15s
Best Surf	4PM (Sat 23rd Aug)	7ft (2.2m) 15s
Most Powerful	4PM (Sat 23rd Aug)	7ft (2.2m) 15s

Table - best surf conditions forecast for Thunders over the next 12 days.

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Short Range Forecast Moderate rain (total 13mm), heaviest on Sat night. Warm (max 29°C on Mon morning, min 26°C on Sat night). Wind will be generally light.									Days 3-6 Weather Summary Moderate rain (total 16mm), heaviest on Thu afternoon. Warm (max 29°C on Tue morning, min 26°C on Tue night). Wind will be generally light.
	Saturday 23			Sunday 24			Monday 25			Tuesday 26			Wednesday 27			Thursday 28			Friday 29
	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night
Rating (10 max)	4	4	4	4	4	4	3	2	2	2	2	2	1	1	1	3	3	3	4	4	3
Swell Height Map See all maps
Wave Height (m) & direction (?)	SSW	SSW	SSW	SSW	SSW	SSW	SSW	SSW	SSW	SSW	SSW	SSW	S	S	S	S	S	S	S	S	S
Period(s) (?)	16	15	14	14	14	13	13	13	13	12	12	15	14	13	13	12	12	12	10	11	11
Wave Graph (?)
Energy (?)	2757	2327	1893	1592	1361	1159	1085	1094	1408	1234	1168	1085	2181	2031	1777	1507	1303	1221	1008	1056	893
Wind (km/h)	NNW	WNW	WNW	NNW	W	ESE	SSE	SSE	SE	SE	SSE	ESE	SE	SSE	SE	ESE	ESE	ESE	ESE	SSE	NE
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	cross- off	cross- off	glass	off	cross- off	glass	on	on	cross- on	cross- on	cross- on	cross- on	cross- on	cross- on	cross- on	cross	cross- on	cross	glass	glass	glass
High Tide / height (m)		6:32PM 0.72		6:37AM 0.98		7:06PM 0.79	7:11AM 0.94		7:39PM 0.84	7:41AM 0.89		8:09PM 0.87	8:10AM 0.82		8:40PM 0.87	8:37AM 0.73		9:10PM 0.85	9:01AM 0.65		9:42PM 0.81
Low Tide / height (m)			12:13AM 0.13		1:05PM 0.05	12:52AM 0.12		1:28PM 0.05	1:30AM 0.12		1:50PM 0.06	2:06AM 0.14		2:12PM 0.07	2:41AM 0.17		2:34PM 0.09	3:17AM 0.21		2:57PM 0.12	3:56AM 0.25

	Saturday 23			Sunday 24			Monday 25			Tuesday 26			Wednesday 27			Thursday 28			Friday 29
Sunrise	6:20	-	-	6:20	-	-	6:20	-	-	6:20	-	-	6:18	-	-	6:18	-	-	6:18	-	-
Sunset	-	6:22	-	-	6:22	-	-	6:22	-	-	6:22	-	-	6:22	-	-	6:21	-	-	6:21	-

Rain (mm)	1	1	9	1	-	-	-	-	1	-	-	4	-	-	-	-	5	7	1	-	-
Temp. °C	28	28	27	27	27	27	29	29	27	29	29	27	29	29	28	29	28	26	28	28	27
Feels °C (?)	31	31	30	29	29	30	31	31	29	31	31	29	29	29	29	31	31	29	32	32	31

Map Icons:
Break
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

Wind Update The wind is still cross-off at Thunders (light winds from the WNW at ASCATB100E3S 79 km from Thunders). 1.2m 16s long period groundswell from the S with a 0.7m 14s groundswell from the SSW and a 0.3m 14s groundswell from the S. 3 swells combining to make bigger set waves.
3 hours 16 minutes ago Thunders

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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Thunders surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.

Information about the Thunders Surf forecast

The above surf forecast table for Thunders provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Thunders can be found by selecting the local surf guide option on the grey menu. Our Thunders surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Thunders) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).

Further information to help with frequently asked questions about our surf forecast for Thunders may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.

Are you planning a holiday in Mentawi Islands? If you are looking for accommodation near Thunders, camping, hotels and holiday cottages in Mentawi Islands, consider staying in Sungaipenuh which is 172 km (107 miles) away.