Big Bay Surf Break

Lat Long: 33.79° S 18.46° E

Big Bay Surf Forecast and Surf Report

Issued: 1 am 07 Aug 2026 (local time)

Forecast update in  hr  min

Today's Big Bay sea temperature is
13.3° C
2.1° 

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 7 Aug 2026:

  • Best quality surf: Friday 7 Aug, 11AM (local time) - 10ft (3.0m), 14s period, SW swell with offshore winds.
  • Most powerful swell: Saturday 8 Aug, 8PM (local time) - 11ft (3.5m), 14s period, SW swell with 4,474 kJ wave energy.
  • Next surfable swell (1★+): Friday 7 Aug, 11AM (local time) - 10ft (3.0m), 14s period with SW 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 07) at 11AM. The primary swell is predicted to be 3.0m and 14s period. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Big Bay in the next 16 days are 3.5m 14s and forecast to arrive on Saturday (Aug 08) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 6s period and expected on Friday (Aug 14) at 8AM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+)11AM (Fri 7th Aug)10ft (3.0m) 14s
Best Surf11AM (Fri 7th Aug)10ft (3.0m) 14s
Most Powerful 8PM (Sat 8th Aug)11ft (3.5m) 14s

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


The Lowdown

G'day, Rusty here. Let's chew the fat on what's coming down the line for the next couple of weeks. It's a story of two halves, really.

We get off to a ripping start Friday morning, August 7th. Big Bay is the only show in town, and it's putting on a proper display. The swell is a solid 10ft from the SW, with a period of 14 seconds – that's proper groundswell, packing a punch with a combined energy of 3673 (moderate to strong). The water temp is sitting at 56°, which is a good 4° colder than usual for this time of year, so you'll be wanting a thicker wetsuit. The wind is light and offshore from the ESE, making the conditions glassy and clean. This is excellent surf, but at 10ft, it's one for the experienced crew only. The sets will be well-spaced with that long period, making the paddle out deceptively easy, but the take-off is serious.

As we move into Friday afternoon, the wind swings to a cross-shore from the SW, and the swell jumps a touch to 12ft, but the quality drops off. The tide might be a factor, and the cross-shore wind will chop it up a bit.

Saturday morning, August 8th, is another standout. The swell drops to a still-very-strong 8ft from the SW (13-second period, 2221 energy), but the wind goes glassy – absolute dead calm from the NNW. That's a rarity and a massive tick for clean, perfect lines. Still a big wave for the big kids, though. By Saturday afternoon, the wind turns onshore, and things get a bit messy.

Sunday, August 9th, is a write-off. The wind is howling out of the SSE at 22 mph, creating a cross-offshore breeze that might look clean on paper but the sheer strength will make it a battle.

The middle of the week, from Monday, August 10th through to Thursday, August 13th, sees the swell settle down to a more manageable 5ft to 8ft, with mostly light winds and clean conditions. Tuesday morning, August 11th, is a beauty with a 6ft SSW swell and offshore E wind at 6 mph. Then Wednesday, August 12th, brings a long-period 18-second swell from the WSW – that's a very long period groundswell. It'll be a bit wonky at a beach break like Big Bay, but the energy is there (2142) and the winds are light.

The first true standout to highlight is Friday morning, August 7th. The combination of a solid 10ft SW groundswell, a 14-second period, and that glassy offshore ESE wind is about as good as it gets for a bigger wave session. The crowd profile at Big Bay is "often," so expect a few out there, but the quality will be worth the company.

The second standout is Thursday morning, August 13th. The swell is a strong 8ft from the WSW with a 17-second period, producing a combined energy of 3192 (strong). The wind is a clean cross-offshore from the NE at 9 mph. It's slightly smaller than Friday, but still a powerful wave for the experienced.

The second week is a bit more mixed. Friday, August 14th, has a glassy afternoon session with a 7ft WSW swell (16 seconds). Saturday, August 15th, is also looking promising with a 8ft swell in the morning and glassy conditions in the afternoon. The swell drops off a bit from Sunday, August 16th, through to Thursday, August 20th, with mostly smaller waves in the 4ft to 6ft range and moderate winds. The energy drops right down into the 500-1000 range (weak to low-moderate).

Then there's a big pulse on the horizon for Friday, August 21st. The swell jumps to 12ft from the WSW, with a 10-second period and a combined energy of 3896 (strong to very strong). The wind is a clean cross-off from the S at 12 mph. This is another big one for experts, but it's a long way out – promising, but less certain. Saturday, August 22nd, looks like a blown-out mess with rain and 25 mph winds, so that big pulse is likely short-lived.

Overall, the first week has the quality, with Friday the 7th and Thursday the 13th being the clear standouts. The second week has a promising but less reliable pulse on the 21st. There's a definite gap in quality from the 16th to the 20th where the swell is small and weaker. Keep your eyes on the forecasts.

Rusty.

Short Range Forecast

Some drizzle, heaviest during Sat night. Very mild (max 16°C on Fri afternoon, min 11°C on Fri morning). Winds increasing (calm on Fri afternoon, fresh winds from the SSE by Sun morning).

Days 4-6 Weather Summary

Mostly dry. Warm (max 22°C on Wed afternoon, min 10°C on Mon night). Winds decreasing (fresh winds from the SSE on Mon afternoon, calm by Wed afternoon).

Friday
7
Saturday
8
Sunday
9
Monday
10
Tuesday
11
Wednesday
12
Thursday
13
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
5
4
5
4
3
4
1
3
3
2
2
4
4
4
4
4
4
5
5
4
4
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
3
SW
14
3.5
SW
14
3
SW
14
2.5
SW
13
3.5
SW
14
3.5
SW
13
3
SW
12
3.5
SSW
12
2.5
SSW
12
1.7
SW
11
1.7
S
10
2.3
SSW
13
1.9
SSW
12
1.6
SSW
12
1.3
WSW
21
1.7
WSW
18
1.9
WSW
18
1.9
SW
16
2.3
WSW
17
2
WSW
16
1.8
WSW
15
Wave Graph
Metric surfscale
Energy kJ
3673
4370
3397
2221
4262
3732
2397
3128
1794
676
535
1877
1051
660
1527
1966
2138
1916
3192
1904
1527
Wind (km/h)
5
ESE
10
SW
10
S
5
NNW
10
W
15
S
35
SSE
35
SSE
20
SE
25
SE
25
SE
15
ESE
10
E
10
S
10
E
10
ENE
10
S
15
ENE
15
NE
5
ENE
15
ENE
Wind State
off
cross
cross-off
glassy
cross-on
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
off
off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
9:52AM1.05m
10:22PM1.20m
11:32AM1.10m
11:55PM1.25m
12:48PM1.23m
1:05AM1.35m
1:45PM1.37m
2:00AM1.45m
2:32PM1.51m
2:47AM1.53m
3:13PM1.62m
3:29AM1.57m
3:52PM1.68m
4:09AM1.56m
Low Tide
3:47PM0.55m
5:09AM0.43m
5:37PM0.51m
6:32AM0.33m
6:57PM0.39m
7:32AM0.21m
7:55PM0.25m
8:19AM0.10m
8:44PM0.13m
9:01AM0.02m
9:27PM0.05m
9:40AM-0.01m
10:07PM0.02m
clear
clear
clear
clear
part cloud
rain showers
clear
clear
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:33
7:31
7:31
7:30
7:28
7:28
7:26
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:09
6:10
6:12
6:12
6:13
6:14
6:14
 mm
1
Temp °C
13
16
13
14
15
13
13
13
13
13
14
11
11
18
17
18
22
22
23
27
25
Feels °C
11
14
11
13
13
10
4
4
6
6
6
7
8
15
14
15
20
17
18
24
21
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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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