Big Bay Surf Break

Lat Long: 33.79° S 18.46° E

Big Bay Surf Forecast and Surf Report

Issued: 1 am 15 Aug 2026 (local time)

Forecast update in  hr  min

Today's Big Bay sea temperature is
12.8° 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 15 Aug 2026:

  • Best quality surf: Saturday 15 Aug, 8AM (local time) - 5.5ft (1.7m), 14s period, WSW swell with glassy winds.
  • Most powerful swell: Monday 17 Aug, 2AM (local time) - 10ft (3.0m), 14s period, WSW swell with 3,331 kJ wave energy.
  • Next surfable swell (1★+): Saturday 15 Aug, 8AM (local time) - 5.5ft (1.7m), 14s period with WSW 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 Saturday (Aug 15) at 8AM. The primary swell is predicted to be 1.7m and 14s period with a secondary swell of 0.7m and 6s. 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 3.0m 14s and forecast to arrive on Monday (Aug 17) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Wednesday (Aug 19) at 11PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Sat 15th Aug)5.5ft (1.7m) 14s
Best Surf 8AM (Sat 15th Aug)5.5ft (1.7m) 14s
Most Powerful 2AM (Mon 17th Aug)10ft (3.0m) 14s

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


The Lowdown

Alright, let's talk Big Bay. Rusty here with the goods on the next couple weeks. We've got a proper swell window comin', but you gotta read the wind right. Size is gonna be the boss.

Starting Saturday the 15th, it's game on. Glassy conditions early with a light ESE wind at about 3 mph. We're looking at a solid 6 ft swell from the WSW, rolling in at 14 seconds. The water is proper chilly, 55°F, which feels a good 5°F colder than usual. The combined energy is cranked at 1100, so there's some serious push. This is prime for experienced surfers, but it's gonna be a handful for beginners. Afternoon goes cross and the tide messes it up.

Sunday the 16th, the swell builds to 6 ft and 7 ft, but the wind turns messy from the NNW and NW, making it cross-onshore and onshore. Quality goes out the window.

Monday the 17th is more of the same: big 8 ft to 8 ft swell but choppy conditions with a shorter 13-second period. A lot of water (energy over 2200) but it's not clean.

Then we hit a sweet spot from Tuesday the 18th through Thursday the 20th. The wind swings to the SSE, holding steady as a clean cross-offshore breeze. Swell sits around 6 ft to 8 ft from the SW, with a 12 to 13-second period. Lots of energy (over 1200 most of the time) and clean faces. Wednesday the 19th morning is a standout: 8 ft, 12 seconds, light SSE wind, clean, and a top-tier call for experienced surfers. Thursday the 20th also looks excellent with a consistent 7 ft and clean conditions all day.

Friday the 21st starts glassy with a 6 ft SW swell, but goes onshore in the afternoon and gets ruined.

Now, for the weekend of the 22nd and 23rd, the ocean is gonna roar. Saturday the 22nd sees a massive jump to 12 ft in the morning, then 15 ft in the afternoon with WSW wind. That's way too big for this spot, and a lumpy, choppy mess. Sunday the 23rd is still giant at 12 ft to 13 ft from the SSW, but a strong cross-offshore wind from the SSE will clean it up. That size is strictly for experts—energy is over 7000. Not a day to mess around.

We get another nice run from Monday the 24th to Tuesday the 25th. Swell drops back to 5 ft to 8 ft from the S/SSW, with a lovely 14 to 15-second period. The wind is light and cross-off, making for clean waves. Monday morning is a true standout: 8 ft SW swell, 14 seconds, offshore winds from the SE, glassy, and excellent for experienced surfers.

After that, Wednesday the 26th and Thursday the 27th are average with cross-onshore winds. A quick flash on Friday the 28th morning with a glassy 8 ft swell from the SW, but it goes onshore in the afternoon. The final weekend of the 29th and 30th looks like a total loss with strong winds and poor conditions.

So, to sum it up: your best windows are the glassy Saturday the 15th morning for the experienced crew, and the clean stretch from the 18th through the 20th, with Monday the 24th morning as the absolute pick.

Rusty out.

Short Range Forecast

Mostly dry. Very mild (max 17°C on Sat afternoon, min 12°C on Sat morning). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Very mild (max 19°C on Thu afternoon, min 13°C on Tue morning). Wind will be generally light.

Saturday
15
Sunday
16
Monday
17
Tuesday
18
Wednesday
19
Thursday
20
Friday
21
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
4
3
3
2
2
4
3
3
4
3
3
4
4
3
3
4
4
3
3
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.7
WSW
14
1.8
WSW
13
2
WSW
13
1.9
WSW
14
2.2
WSW
14
3
WSW
14
2.5
WSW
13
2.4
WSW
13
2.3
WSW
13
1.8
WSW
13
2.4
SW
13
3
SW
12
2.5
SW
12
2.1
SW
12
1.9
SW
12
2.1
SW
12
2.1
SW
12
1.8
SW
12
1.7
SW
11
1.6
SW
11
1.3
SW
11
Wave Graph
Metric surfscale
Energy kJ
1043
1144
1444
1403
2082
3331
2528
2026
1783
1044
1982
2221
1731
1180
946
1189
1341
939
708
564
437
Wind (km/h)
5
ESE
5
SSW
10
NNW
15
NNW
10
NW
10
NNE
10
NNW
10
SW
15
SSE
20
SSE
20
S
10
SE
10
S
15
SSE
10
SSE
10
SSE
15
SSE
5
SSE
5
NW
15
W
15
NNE
Wind State
glassy
cross
cross-on
cross-on
on
cross
cross-on
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
glassy
on
cross
High Tide
5:05PM1.64m
5:22AM1.43m
5:39PM1.55m
5:57AM1.33m
6:13PM1.43m
6:32AM1.21m
6:48PM1.29m
7:12AM1.10m
7:29PM1.15m
8:07AM0.99m
8:32PM1.04m
9:49AM0.92m
10:25PM0.98m
Low Tide
10:51AM0.05m
11:22PM0.09m
11:24AM0.14m
11:57PM0.19m
11:57AM0.25m
00:31AM0.30m
12:30PM0.38m
1:08AM0.42m
1:06PM0.51m
1:55AM0.54m
1:57PM0.63m
3:19AM0.62m
3:53PM0.70m
part cloud
part cloud
part cloud
part cloud
clear
part cloud
cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:24
7:24
7:22
7:22
7:20
7:20
7:18
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:15
6:15
6:16
6:17
6:19
6:19
6:20
 mm
Temp °C
14
17
16
16
17
15
16
16
15
15
16
14
16
17
14
16
19
16
19
18
15
Feels °C
13
15
15
13
14
14
16
16
14
11
12
13
14
14
12
14
17
15
19
17
14
  • 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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