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Surf Forecasts:
4 Bobs surfForecast / Mentawi Islands / Indonesia
12 Day Weather and Surf, issued 6 am Friday 19 Sep 2025 WIB
Best Forecast Surf Conditions for 4 Bobs this week:
The surf forecast for 4 Bobs over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Sep 19) at 10AM. The primary swell is predicted to be 1.3m and 12s period with a secondary swell of 0.9m and 16s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at 4 Bobs in the next 12 days are 1.9m 18s and forecast to arrive on Tuesday (Sep 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+) | 10AM (Fri 19th Sep) | 4.5ft (1.3m) 12s |
| Best Surf | 7AM (Sat 20th Sep) | 4.5ft (1.4m) 17s |
| Most Powerful | 4PM (Tue 23rd Sep) | 6ft (1.9m) 18s |
Table - best surf conditions forecast for 4 Bobs over the next 12 days.
Short Range Forecast Light rain (total 9mm), mostly falling on Sat night. Warm (max 28°C on Fri afternoon, min 26°C on Fri night). Wind will be generally light. | Days 3-6 Weather Summary Heavy rain (total 29mm), heaviest during Tue night. Warm (max 28°C on Mon morning, min 25°C on Wed morning). Wind will be generally light. | ||||||||||||||||||||
Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | Wednesday 24 | Thursday 25 | |||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 12 | 13 | 16 | 18 | 17 | 16 | 16 | 15 | 14 | 24 | 23 | 21 | 19 | 18 | 17 | 16 | 16 | 16 | 15 | 15 | 15 |
Wave (?)Graph  | |||||||||||||||||||||
 kJ (?) | 480 | 683 | 907 | 1309 | 1165 | 1230 | 720 | 1479 | 1212 | 425 | 781 | 1445 | 1965 | 2344 | 2312 | 1611 | 1314 | 1194 | 856 | 757 | 1341 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | glass | cross | cross- off | off | cross | cross- on | cross | cross- on | cross- on | cross- on | on | on | on | cross- off | cross | cross- off | cross- off | glass | off | glass | glass |
High Tide / height (m) | 5:15PM 0.85 | 5:22AM 1.09 | 5:51PM 0.96 | 5:59AM 1.11 | 6:23PM 1.05 | 6:33AM 1.10 | 6:54PM 1.12 | 7:04AM 1.06 | 7:23PM 1.16 | 7:33AM 1.01 | 7:50PM 1.17 | 8:01AM 0.93 | 8:17PM 1.14 | ||||||||
Low Tide / height (m) | 11:22AM 0.18 | 10:58PM 0.25 | 11:47AM 0.14 | 11:40PM 0.18 | 12:09PM 0.10 | 12:15AM 0.14 | 12:30PM 0.08 | 12:48AM 0.10 | 12:53PM 0.06 | 1:20AM 0.09 | 1:16PM 0.06 | 1:52AM 0.09 | 1:41PM 0.06 | 2:24AM 0.11 | |||||||
Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | Wednesday 24 | Thursday 25 | |||||||||||||||
| Sunrise | 6:13 | - | - | 6:13 | - | - | 6:11 | - | - | 6:11 | - | - | 6:11 | - | - | 6:11 | - | - | 6:11 | - | - |
| Sunset | - | 6:19 | - | - | 6:19 | - | - | 6:19 | - | - | 6:17 | - | - | 6:17 | - | - | 6:17 | - | - | 6:17 | - |
 |  |  |  | | |  | |  | | | | | | | | | | | |  | |
Rain (mm) | - | 1 | 3 | - | - | 5 | - | - | - | - | - | 10 | 4 | 3 | 11 | 1 | - | - | - | - | - |
| Temp. °C | 27 | 28 | 27 | 28 | 28 | 28 | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 27 | 26 | 26 | 26 | 27 | 28 | 27 |
| Feels °C (?) | 31 | 32 | 31 | 33 | 31 | 32 | 31 | 30 | 31 | 31 | 30 | 30 | 32 | 32 | 30 | 28 | 28 | 30 | 31 | 32 | 31 |
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Recent Eyeball Surf Reports for Mentawi Islands
Continuing clean conditions at 4 Bobs (calm at MiaPadang 165 km from 4 Bobs). 0.9m 12s groundswell from the SSW with a 0.7m 9s swell from the S and a 0.4m 15s groundswell from the SW. 3 swells combining to make bigger set waves.
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our 4 Bobs 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 4 Bobs Surf forecast
The above surf forecast table for 4 Bobs provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at 4 Bobs can be found by selecting the local surf guide option on the grey menu. Our 4 Bobs 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 (4 Bobs) 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 4 Bobs 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 4 Bobs, camping, hotels and holiday cottages in Mentawi Islands, consider staying in Padang which is 157 km (98 miles) away.
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