4 Bobs surfForecast / Mentawi Islands / Indonesia

information circle12 Day Weather and Surf, issued 12 am Monday 12 Jan 2026 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 Monday (Jan 12) at 7AM. The primary swell is predicted to be 0.6m and 11s period with a secondary swell of 0.6m and 8s. Another secondary swell of 0.5m and 9s is also forecast. 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 1.4m 18s and forecast to arrive on Sunday (Jan 18) at 7PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 6s period and expected on Sunday (Jan 18) at 1AM.

Wave TypeTime (WIB) & Date Wave Height & Period
Next good surf (1 star+) 7AM (Mon 12th Jan)2ft (0.6m) 11s
Best Surf 1PM (Sat 17th Jan)3.5ft (1.0m) 16s
Most Powerful 7PM (Sun 18th Jan)4.5ft (1.4m) 18s

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 2mm), mostly falling on Sun night. Warm (max 28°C on Mon afternoon, min 26°C on Mon night). Wind will be generally light.

Days 3-6 Weather Summary Heavy rain (total 42mm), heaviest during Sat afternoon. Warm (max 28°C on Fri morning, min 26°C on Wed night). Wind will be generally light.

Monday
12
Tuesday
13
Wednesday
14
Thursday
15
Friday
16
Saturday
17
Sun
18
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
1
1
1
1
1
2
2
1
2
2
2
2
2
2
1
2
2
2
2
3
Swell
Height Map
Wave Height (m) & direction (?)
0.7
SSW
0.5
SW
0.5
SSE
0.6
S
0.6
S
0.4
SW
0.6
SW
0.8
SW
0.9
SW
0.9
SW
1
SW
1
SW
0.9
SW
0.8
SW
0.8
SW
0.6
SSW
0.6
SW
1
SW
1.1
SW
1.1
SW
0.9
SW
Period(s) (?)111199918171615151414141414171616151418
Wave
Graph
(?)Metric surfscale
Energy kJ (?)1096349616384188302375380371393341277224202211489485536449
Wind
(km/h)
5
SW
5
N
5
WNW
10
NW
10
NNW
10
WNW
10
NW
5
NW
10
WSW
10
NW
10
NNW
10
NW
15
WNW
15
NNW
15
NW
20
NW
10
WNW
15
W
25
W
15
NW
15
NW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on
offcross-
off
cross-
off
offcross-
off
cross-
off
cross-
off
cross-
on
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
crosscross-
off
cross-
off
cross-
off
High Tide
/ height (m)
12:06AM
0.69
1:33PM
0.90
1:25AM
0.59
2:38PM
0.91
2:56AM
0.55
3:39PM
0.94
4:11AM
0.55
4:33PM
0.99
5:07AM
0.59
5:18PM
1.05
5:52AM
0.63
5:59PM
1.11
6:30AM
0.69
6:35PM
1.17
Low Tide
/ height (m)
5:49AM
0.26
7:26PM
0.46
6:37AM
0.29
9:38PM
0.43
7:38AM
0.31
11:01PM
0.36
8:48AM
0.31
11:37PM
0.29
9:53AM
0.27
12:06AM
0.22
10:48AM
0.23
12:33AM
0.16
11:34AM
0.18
Monday
12
Tuesday
13
Wednesday
14
Thursday
15
Friday
16
Saturday
17
Sun
18
Sunrise-6:24--6:24--6:24--6:24--6:24--6:26--6:26-
Sunset--6:37--6:37--6:37--6:37--6:37--6:38--6:38
rain showers
clear
clear
clear
part cloud
thunderstorm
clear
clear
clear
clear
part cloud
thunderstorm
rain showers
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
mod rain
Rain (mm)
1----1-----1615125121167
Temp. °C272728272728272728272727272828272626262727
Feels °C (?)313131303031293030293029293030292828282929
  • 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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