- Forecast
- Maps
- Live
- Weather State
- Spot Information
Surf Forecasts:
4 Bobs surfForecast / Mentawi Islands / Indonesia
48hr Weather and Surf, issued 6 pm Monday 18 May 2026 WIBForecast update in hr min s Forecast update imminent
4 Bobs surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's 4 Bobs sea temperature is
30.2° C
(Which is normal for this time of year)How big are the waves at 4 Bobs today?
The current surf forecast for 4 Bobs at 10PM is: 1.4m 14s primary swell from a South direction and 0.6m 18s secondary swell from a Southwest direction (forecast issued at 06:00pm May 18). The wind direction is predicted to be cross-onshore.
| Time (WIB) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 May) | - | - |
| Afternoon (18 May) | 5ft (1.5m) | 15s |
| Evening (18 May) | 4.5ft (1.4m) | 14s |
Table - waves today at 4 Bobs. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastModerate rain (total 18mm), heaviest on Mon night. Warm (max 29°C on Mon afternoon, min 28°C on Mon night). Wind will be generally light. | ||||||||||||||||||||||||
Mon 18 | Tuesday 19 | Wednesday 20 | Thu 21 | |||||||||||||||||||||
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 | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
S 15 | S 14 | S 14 | S 14 | S 14 | S 13 | S 13 | S 13 | S 13 | S 13 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | |
971 | 769 | 747 | 768 | 736 | 683 | 663 | 653 | 643 | 546 | 504 | 504 | 517 | 511 | 492 | 553 | 619 | 603 | 572 | 557 | 557 | 705 | 550 | 550 | |
Wind (km/h) | ||||||||||||||||||||||||
on | on | cross-on | cross-on | glassy | glassy | glassy | glassy | glassy | glassy | glassy | glassy | glassy | glassy | cross-off | cross-off | glassy | glassy | glassy | glassy | glassy | glassy | cross-off | glassy | |
High Tide | 7:28PM0.82m | 7:46AM1.38m | 8:16PM0.78m | 8:35AM1.32m | 9:09PM0.75m | 9:27AM1.23m | ||||||||||||||||||
Low Tide | 1:33PM-0.04m | 00:58AM-0.01m | 2:21PM-0.02m | 1:44AM0.03m | 3:10PM0.04m | 2:32AM0.10m | ||||||||||||||||||
 |  | |  | |  | | | | | | | | | |  | | |  | | | | | | |
 | — | — | — | — | 6:18 | — | — | — | — | — | — | — | 6:18 | — | — | — | — | — | — | — | 6:18 | — | — | — |
 | 6:19 | — | — | — | — | — | — | — | 6:19 | — | — | — | — | — | — | — | 6:20 | — | — | — | — | — | — | 6:20 |
— | — | — | 2 | 3 | 1 | — | — | 1 | 1 | 2 | 2 | 1 | — | — | — | — | 1 | — | 1 | 3 | — | — | — | |
Temp °C | 29 | 29 | 29 | 28 | 28 | 28 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 29 |
32 | 33 | 34 | 33 | 33 | 33 | 34 | 34 | 34 | 34 | 32 | 33 | 33 | 33 | 32 | 33 | 34 | 34 | 33 | 33 | 33 | 33 | 32 | 34 | |
Swell 1 Height (m) Direction Period (s) | S 15 | S 14 | S 14 | S 14 | S 14 | S 13 | S 13 | S 13 | S 13 | S 13 | S 12 | S 12 | SW 16 | S 12 | S 12 | S 12 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 |
 kJ | 971 | 769 | 747 | 768 | 736 | 683 | 663 | 653 | 643 | 546 | 504 | 477 | 517 | 400 | 336 | 336 | 619 | 603 | 572 | 557 | 557 | 705 | 550 | 550 |
Swell 2 Height (m) Direction Period (s) | W 8 | W 8 | SW 18 | SW 18 | SW 18 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | S 9 | SW 16 | SW 16 | SW 16 | S 12 | S 11 | S 10 | S 11 | S 9 | S 9 | S 9 | S 11 |
| kJ | 51 | 36 | 199 | 375 | 370 | 304 | 297 | 260 | 366 | 498 | 498 | 504 | 139 | 511 | 492 | 553 | 325 | 298 | 257 | 224 | 101 | 101 | 101 | 181 |
Swell 3 Height (m) Direction Period (s) | SW 19 | SW 19 | W 8 | W 8 | W 8 | W 8 | WNW 8 | WNW 8 | WNW 8 | WNW 8 | WNW 8 | WNW 8 | S 12 | WNW 8 | WNW 8 | WNW 7 | WNW 7 | WNW 7 | WNW 7 | WNW 7 | S 11 | S 11 | S 11 | WNW 7 |
| kJ | 236 | 130 | 35 | 34 | 34 | 34 | 22 | 22 | 22 | 21 | 20 | 12 | 180 | 11 | 11 | 11 | 11 | 11 | 10 | 5 | 87 | 84 | 59 | 5 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 7 | 103 | 7 | 19 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Mentawi Islands | ||||||||||||||||||||||||
Best forecast wave conditions in Indonesia | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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.
Nearest