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Surf Forecasts:
4 Bobs surfForecast / Mentawi Islands / Indonesia
48hr Weather and Surf, issued 12 am Wednesday 20 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
30.3° C
(Which is slightly warmer than usual)How big are the waves at 4 Bobs today?
The current surf forecast for 4 Bobs at 3AM is: 1.0m 16s primary swell from a Southwest direction and 0.9m 9s secondary swell from a South direction (forecast issued at 12:00am May 20). The wind direction is predicted to be glassy and the swell rating is 3.
| Time (WIB) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 May) | 3.5ft (1.0m) | 16s |
| Afternoon (20 May) | 3.5ft (1.1m) | 16s |
| Evening (20 May) | 3.5ft (1.1m) | 15s |
Table - waves today at 4 Bobs. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastHeavy rain (total 30mm), heaviest during Wed night. Warm (max 29°C on Wed morning, min 27°C on Wed night). Wind will be generally light. | ||||||||||||||||||||||||
Wednesday 20 | Thursday 21 | Friday 22 | ||||||||||||||||||||||
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 | 10 PM | |
Swell Height Map |    |    |    | |||||||||||||||||||||
SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | |
504 | 517 | 511 | 492 | 627 | 619 | 595 | 572 | 557 | 557 | 696 | 550 | 550 | 557 | 603 | 692 | 674 | 614 | 606 | 685 | 685 | 685 | 695 | 805 | |
Wind (km/h) | ||||||||||||||||||||||||
glassy | off | off | cross-off | cross-off | cross-off | cross-on | cross | cross-off | glassy | glassy | glassy | glassy | glassy | glassy | glassy | glassy | glassy | off | glassy | glassy | cross-off | cross-off | cross-off | |
High Tide | 8:35AM1.32m | 9:09PM0.75m | 9:27AM1.23m | 10:10PM0.73m | 10:24AM1.13m | |||||||||||||||||||
Low Tide | 1:44AM0.03m | 3:10PM0.04m | 2:32AM0.10m | 4:02PM0.11m | 3:25AM0.19m | 4:57PM0.17m | ||||||||||||||||||
 | |  | |  |  |  | | | | | | | |  | | | | | | | | | | |
 | — | 6:18 | — | — | — | — | — | — | — | 6:18 | — | — | — | — | — | — | — | 6:18 | — | — | — | — | — | — |
 | — | — | — | — | — | 6:20 | — | — | — | — | — | — | — | 6:20 | — | — | — | — | — | — | — | 6:20 | — | — |
1 | 2 | — | — | — | 1 | — | 1 | 4 | 1 | 2 | — | 1 | 1 | — | — | 2 | 2 | 1 | 1 | 1 | 2 | 4 | 5 | |
Temp °C | 28 | 28 | 28 | 29 | 29 | 29 | 29 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 27 | 28 | 28 | 28 | 27 | 27 |
33 | 32 | 32 | 33 | 33 | 33 | 33 | 32 | 32 | 32 | 33 | 32 | 32 | 33 | 32 | 33 | 32 | 31 | 31 | 33 | 32 | 31 | 28 | 29 | |
Swell 1 Height (m) Direction Period (s) | S 12 | SW 16 | S 12 | S 12 | S 12 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 |
 kJ | 477 | 517 | 400 | 336 | 336 | 619 | 595 | 572 | 557 | 557 | 696 | 550 | 550 | 557 | 603 | 692 | 674 | 614 | 606 | 685 | 685 | 685 | 695 | 805 |
Swell 2 Height (m) Direction Period (s) | SW 16 | S 9 | SW 16 | SW 16 | SW 16 | S 12 | S 11 | S 10 | S 11 | S 9 | S 9 | S 11 | S 11 | S 10 | S 10 | S 10 | S 9 | S 9 | S 9 | S 9 | S 9 | S 9 | S 9 | S 9 |
| kJ | 504 | 139 | 511 | 492 | 627 | 330 | 298 | 262 | 224 | 101 | 78 | 182 | 178 | 146 | 149 | 117 | 113 | 108 | 81 | 81 | 56 | 62 | 56 | 55 |
Swell 3 Height (m) Direction Period (s) | WNW 8 | S 12 | WNW 8 | WNW 8 | WNW 7 | WNW 7 | WNW 7 | WNW 7 | W 7 | S 11 | S 11 | W 7 | W 7 | WNW 7 | WNW 7 | WNW 7 | WNW 7 | WNW 7 | WNW 7 | WNW 7 | SSE 9 | SSE 9 | WNW 8 | WNW 7 |
| kJ | 12 | 180 | 11 | 11 | 11 | 11 | 11 | 10 | 4 | 87 | 84 | 4 | 4 | 5 | 5 | 5 | 5 | 5 | 5 | 4 | 8 | 15 | 13 | 18 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 80 | 10 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 80 | 11 |
Best forecast wave conditions in Mentawi Islands | ||||||||||||||||||||||||
Best forecast wave conditions in Indonesia | ||||||||||||||||||||||||
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