Big Bay Surf Break

Lat Long: 33.79° S 18.46° E

Big Bay Surf Forecast and Surf Report

Issued: 1 pm 21 Aug 2026 (local time)

Forecast update in  hr  min

Today's Big Bay sea temperature is
12.9° C
2.7° 

Big Bay surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Big Bay surf forecast from 21 Aug 2026:

  • Best quality surf: Saturday 22 Aug, 11PM (local time) - 6.5ft (2.0m), 10s period, SW swell with glassy winds.
  • Most powerful swell: Tuesday 25 Aug, 5AM (local time) - 8ft (2.5m), 15s period, SW swell with 2,784 kJ wave energy.
  • Next surfable swell (1★+): Friday 21 Aug, 8PM (local time) - 4.5ft (1.4m), 11s period with SSW swell.

Best Forecast Surf Conditions for Big Bay this week:

The surf forecast for Big Bay over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 21) at 8PM. The primary swell is predicted to be 1.4m and 11s period with a secondary swell of 1.3m and 11s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Big Bay in the next 16 days are 2.5m 15s and forecast to arrive on Tuesday (Aug 25) at 5AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Tuesday (Aug 25) at 5AM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 8PM (Fri 21st Aug)4.5ft (1.4m) 11s
Best Surf11PM (Sat 22nd Aug)6.5ft (2.0m) 10s
Most Powerful 5AM (Tue 25th Aug)8ft (2.5m) 15s

Table - best surf conditions forecast for Big Bay over the next 16 days.


The Lowdown

Alright, let's talk about the surf.

It's a bit nippy out there at Big Bay right now, water temp's at 55°F, which is about 5°F colder than it should be for this time of year. You're gonna want the booties and a good hood.

The weekend kicks off with a decent option Friday morning. Clean 2.1m (about 7ft) SW swell, with an 11-second period. The wind's light and cross-offshore, and the ocean has that smooth, clean look. Wave energy is moderate, sitting at 1092. It's a good one for the guys who know what they're doing, a bit much for the beginners.

The rest of the weekend is a bit of a letdown. Saturday is smaller and weaker with a cross-on wind, not much to write home about. But Sunday morning, that's where it picks back up. The swell pushes to 2.3m (8ft) from the WSW, the period stretches to 13 seconds, and the energy jumps to 1720. The wind is light and offshore again, so it's clean. Sunday afternoon holds that quality with a 2.2m (7ft) swell and clean conditions. That's a solid start to the week.

Monday is still okay, but the wind picks up a bit in the afternoon.

Now, here's the one to circle on the calendar: next Tuesday, the 25th. The morning brings a strong 2.4m (8ft) SW swell with a long, powerful 14-second period. The energy is up at 2414 and the wind is a clean cross-off. That's a serious, well-ordered swell. It's the best of the first week by a long shot.

The middle of the week backs off a bit, with smaller, but still rideable, surf. Then Friday the 28th looks fun again, especially the afternoon, with a 1.4m (5ft) WSW swell and 14-second period under glassy conditions. That's a clean, playful wave.

Looking further out, the end of the month gets big. The morning of Saturday the 30th has a 3.0m (10ft) swell with glassy conditions and a huge energy reading of 4378. That's a heavy, powerful groundswell. This is strictly for the experts, it's well over 8ft.

And then, we have another standout on the first of September. The afternoon of that Tuesday is looking at a 2.5m (8ft) SW swell with a super long, 15-second period and light offshore winds. The energy is over 3200. That's a classic, high-quality, long-period groundswell.

But, be careful. The 3rd of September shows a massive pulse, with swells predicted at 5.0m (16ft). That's just too big for this break. The energy readings are enormous, but it'll be a complete mess, too big for paddling. A few days after that still have a lot of size and some onshore wind, so conditions will be rough.

So, the two best bets are next Tuesday the 25th, and the afternoon of Tuesday, September 1st. The big stuff on the 3rd is for looking at, not surfing. It's going to be a good couple of weeks, just know your limits.

Later.
Rusty.

Short Range Forecast

Mostly dry. Very mild (max 18°C on Fri afternoon, min 12°C on Sun morning). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Warm (max 27°C on Wed afternoon, min 13°C on Mon night). Wind will be generally light.

Fri
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
Thursday
27
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
3
3
2
1
4
4
4
4
4
1
4
4
3
4
3
3
2
1
2
3
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.8
SW
11
1.4
SSW
10
1.3
SSW
12
1.2
SSW
12
1.8
SW
10
2.3
WSW
13
2.2
WSW
12
2.1
WSW
12
1.9
SW
12
1.2
WSW
11
2.4
SW
15
2.4
SW
14
2.2
SW
14
1.7
WSW
13
1.3
WSW
13
1.2
WSW
12
1.1
S
11
0.9
WSW
12
0.9
WSW
12
1
S
11
Wave Graph
Metric surfscale
Energy kJ
792
388
443
397
707
1674
1532
1236
995
376
2665
2141
1748
1061
587
440
274
218
198
223
Wind (km/h)
10
SW
5
SSE
10
NW
10
W
5
SE
10
SSE
10
S
10
SSE
15
SSE
25
SSE
15
SE
15
SE
15
SSE
20
ESE
10
ESE
10
SE
10
N
10
NW
10
WNW
10
ESE
Wind State
cross
glassy
cross-on
cross-on
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
off
off
cross-off
cross
cross-on
on
off
High Tide
10:25PM0.98m
11:54AM0.96m
00:06AM1.04m
12:58PM1.07m
1:01AM1.13m
1:36PM1.19m
1:40AM1.24m
2:08PM1.31m
2:13AM1.33m
2:36PM1.42m
2:44AM1.41m
3:04PM1.52m
3:14AM1.47m
Low Tide
3:53PM0.70m
5:32AM0.61m
6:08PM0.66m
6:46AM0.52m
7:07PM0.56m
7:27AM0.41m
7:45PM0.45m
7:59AM0.30m
8:17PM0.34m
8:27AM0.21m
8:46PM0.24m
8:54AM0.14m
9:15PM0.16m
clear
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
clear
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:16
7:16
7:15
7:13
7:11
7:11
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:20
6:21
6:21
6:22
6:22
6:22
6:23
 mm
Temp °C
18
16
15
16
15
14
16
13
15
17
14
16
20
18
20
27
24
19
18
18
Feels °C
16
15
13
13
15
12
14
11
12
13
11
12
16
15
18
25
23
17
16
16
  • Map Icons:
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  • 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 Big Bay Surf forecast

The above surf forecast table for Big Bay provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Big Bay can be found by selecting the local surf guide option on the grey menu. Our Big Bay 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 (Big Bay) 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 Big Bay 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.

Big Bay is 8 km (5 miles) from the very large city of Robben Island. If you plan a holiday in Cape Town, look for hotels and other accommodation in Robben Island. Robben Island has rooms for a wide range of budgets as well as cheap car hire and transport links.

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