4 Bobs surfForecast / Mentawi Islands / Indonesia

information circle12 Day Weather and Surf, issued 6 pm Saturday 20 Dec 2025 WIB
Forecast 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
29.1° C
(Which is normal for this time of year)


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 Sunday (Dec 21) at 4AM. The primary swell is predicted to be 0.6m and 16s period with a secondary swell of 0.8m and 10s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at 4 Bobs in the next 12 days are 1.5m 16s and forecast to arrive on Saturday (Dec 27) at 4PM. Winds are predicted to be cross-offshore at the time the swell arrives.

Wave TypeTime (WIB) & Date Wave Height & Period
Next good surf (1 star+) 4AM (Sun 21st Dec)2ft (0.6m) 16s
Best Surf 4AM (Sun 21st Dec)2ft (0.6m) 16s
Most Powerful 4PM (Sat 27th Dec)5ft (1.5m) 16s

Table - best surf conditions forecast for 4 Bobs over the next 12 days.

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Light rain (total 9mm), mostly falling on Mon night. Warm (max 28°C on Sat afternoon, min 26°C on Sat night). Wind will be generally light.

Days 3-6 Weather Summary Heavy rain (total 40mm), heaviest during Fri morning. Warm (max 29°C on Thu morning, min 25°C on Fri morning). Winds increasing (light winds from the NW on Tue night, fresh winds from the NW by Fri morning).

Sat
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thursday
25
Friday
26
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
1
2
2
1
2
2
2
2
2
1
2
2
2
2
1
1
0
1
2
2
2
Swell
Height Map
Wave Height (m) & direction (?)
1
SSW
0.6
SW
0.6
SSW
0.7
SW
0.7
SW
0.9
SW
0.7
SW
0.8
SW
0.9
SW
0.8
SW
0.8
SW
0.9
SSE
0.8
SW
0.6
S
0.6
S
0.9
SW
0.9
SW
0.7
SW
1.1
SW
1.4
SW
1.4
SW
Period(s) (?)111615151515141413131310141816141419181716
Wave
Graph
(?)Metric surfscale
Energy kJ (?)2432061522172233092112342612082051732182251882882973807191048929
Wind
(km/h)
10
W
15
WNW
10
NNW
5
W
10
WNW
10
NNW
15
NW
15
NW
15
NW
10
W
5
NW
15
NNW
10
WNW
15
NW
15
NNW
25
WNW
25
WNW
25
NW
20
WNW
15
WNW
25
WNW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscross-
off
offcrosscross-
off
offcross-
off
cross-
off
cross-
off
crosscross-
off
offcross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
High Tide
/ height (m)
6:45PM
1.17
7:14AM
0.70
7:19PM
1.18
7:48AM
0.72
7:51PM
1.18
8:22AM
0.73
8:22PM
1.16
8:57AM
0.76
8:53PM
1.13
9:36AM
0.78
9:25PM
1.08
10:21AM
0.82
10:03PM
1.01
11:14AM
0.86
Low Tide
/ height (m)
1:11AM
0.11
12:24PM
0.13
1:45AM
0.09
1:02PM
0.14
2:18AM
0.09
1:41PM
0.16
2:52AM
0.10
2:21PM
0.20
3:27AM
0.11
3:04PM
0.25
4:04AM
0.13
3:54PM
0.30
4:43AM
0.15
Sat
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thursday
25
Friday
26
Sunrise--6:13--6:13--6:13--6:13--6:15--6:15--6:16
Sunset6:25--6:27--6:27--6:28--6:28--6:29--6:29--
thunderstorm
rain showers
clear
clear
clear
clear
thunderstorm
rain showers
thunderstorm
thunderstorm
rain showers
thunderstorm
thunderstorm
rain showers
part cloud
thunderstorm
thunderstorm
thunderstorm
light rain
thunderstorm
mod rain
Rain (mm)
12----14112213-51511189
Temp. °C282728282728282728282728282729282725262727
Feels °C (?)313032323031303030313031313031282725272728
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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