4 Bobs surfForecast / Mentawi Islands / Indonesia

information circle12 Day Weather and Surf, issued 6 am 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 Saturday (Dec 20) at 1PM. The primary swell is predicted to be 1.1m and 12s period with a secondary swell of 0.5m and 16s. 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 17s and forecast to arrive on Saturday (Dec 27) at 1AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 2s period and expected on Saturday (Dec 20) at 1PM.

Wave TypeTime (WIB) & Date Wave Height & Period
Next good surf (1 star+) 1PM (Sat 20th Dec)3.5ft (1.1m) 12s
Best Surf10PM (Fri 26th Dec)3.5ft (1.1m) 18s
Most Powerful 1AM (Sat 27th Dec)4.5ft (1.4m) 17s

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 7mm), mostly falling on Mon night. Warm (max 28°C on Sat morning, min 26°C on Sat night). Wind will be generally light.

Days 3-6 Weather Summary Heavy rain (total 33mm), heaviest during Thu night. Warm (max 28°C on Tue morning, min 26°C on Thu night). Winds increasing (light winds from the W on Wed afternoon, fresh winds from the WNW by Thu night).

Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thursday
25
Friday
26
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
2
2
2
2
2
2
2
2
2
2
1
2
2
1
2
1
1
1
1
2
3
Swell
Height Map
Wave Height (m) & direction (?)
0.9
SSW
1
SSW
0.6
SW
0.6
SSW
0.7
SW
0.7
SW
0.9
SW
0.7
SW
0.9
SW
0.9
SW
0.8
SW
0.8
SW
0.8
S
0.8
SW
0.6
S
0.6
S
0.9
SW
0.9
SW
0.7
SW
1.1
SW
1.4
SW
Period(s) (?)111116151515151414131313101418161414191817
Wave
Graph
(?)Metric surfscale
Energy kJ (?)2272432061522172233092112802612082051362212251862882973807191036
Wind
(km/h)
10
NW
10
WNW
15
NW
10
NNW
5
WSW
10
NW
10
NNW
10
WNW
15
WNW
10
NW
10
W
10
NNW
10
NW
5
W
15
WNW
15
NW
20
WNW
30
WNW
25
NW
25
WNW
5
WNW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
cross-
off
cross-
off
offglasscross-
off
offcross-
off
cross-
off
cross-
off
crosscross-
off
cross-
off
crosscross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
glass
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
Low Tide
/ height (m)
11:46AM
0.15
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
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thursday
25
Friday
26
Sunrise6:11--6:13--6:13--6:13--6:13--6:15--6:15--
Sunset-6:25--6:27--6:27--6:28--6:28--6:29--6:29-
thunderstorm
part cloud
rain showers
part cloud
clear
clear
rain showers
thunderstorm
rain showers
thunderstorm
thunderstorm
rain showers
thunderstorm
clear
rain showers
clear
thunderstorm
thunderstorm
thunderstorm
cloud
thunderstorm
Rain (mm)
1-1---1131111-2-2258-11
Temp. °C282827282827282827282827282828282827272626
Feels °C (?)323130323230323130313130313132302927262629
  • 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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