Big Bay Surf Break

Lat Long: 33.79° S 18.46° E

Big Bay Surf Forecast and Surf Report

Issued: 1 pm 18 Jul 2026 (local time)

Forecast update in  hr  min

Today's Big Bay sea temperature is
14.6° C
0.8° 

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 18 Jul 2026:

  • Best quality surf: Friday 24 Jul, 2AM (local time) - 11ft (3.5m), 16s period, SW swell with glassy winds.
  • Most powerful swell: Friday 24 Jul, 2AM (local time) - 11ft (3.5m), 16s period, SW swell with 6,307 kJ wave energy.
  • Next surfable swell (1★+): Sunday 19 Jul, 8PM (local time) - 7ft (2.1m), 11s 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 Sunday (Jul 19) at 8PM. The primary swell is predicted to be 2.1m and 11s period with a secondary swell of 0.7m and 10s. 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 3.5m 16s and forecast to arrive on Friday (Jul 24) at 2AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 6s period and expected on Saturday (Jul 25) at 5PM.

Wave TypeTime (SAST) & Date Wave Height & Period
Next good surf (1 star+) 8PM (Sun 19th Jul)7ft (2.1m) 11s
Best Surf 2AM (Fri 24th Jul)11ft (3.5m) 16s
Most Powerful 2AM (Fri 24th Jul)11ft (3.5m) 16s

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


The Lowdown

Alright folks, Rusty here with a look at what's coming our way at Big Bay. We've got a solid run of surf ahead, but you’re gonna have to work for the really good ones. The first few days are a bit rough, but the horizon is looking mean by the end of the month.

The week starts off a little slow. Saturday afternoon the 18th has a small 3ft SW swell, but it's rideable. Water temp is 58°F, which is about 1°F cooler than average for this time of year, so it's a touch nippy but nothing crazy. By Sunday the 19th, a new SW swell fills in to 5ft in the morning and 6ft by the afternoon. The problem is the wind is messy, coming cross-onshore both sessions, so expect bumpy conditions.

Monday morning the 20th is a turnaround. We get a clean 6ft SW groundswell with glassy conditions. That's a real highlight for a session if you can get out there early. The period is 9 seconds, so it's not the most powerful, but with clean faces it'll be fun. The afternoon gets a bit weak and cross-onshore, so morning is your window.

Now, Tuesday the 21st is a standout. Morning starts with 6ft of SW groundswell and a very long 14-second period, all under glassy skies. The combined energy is pumping at 1516. That's a solid session for any intermediate surfer. It gets even bigger in the afternoon, hitting 8ft with the same long 14-second period and glassy winds. The energy jumps to 2118. This is shaping up to be the pick of the first week, but that size is getting into expert territory in the afternoon.

Wednesday the 22nd turns on the wind, with cross-onshore breezes making things choppy and less appealing. The swell holds at 7ft, but it's not worth fighting the bump.

Thursday the 23rd stays big, 7ft, but wind is still an issue. The afternoon sees some better offshore flow, but it’s still not perfect.

Now, hold onto your boards, because Friday the 24th is the big one for the month. We’re looking at a 10ft SW groundswell with a long 14-second period. The morning is glassy, with the combined energy reading 3936. That's a powerful, heavy swell. This is strictly for experienced surfers only. The afternoon cleans up with a cross-offshore breeze, but at this size, it's still a big-boy wave. If you’ve got the skills, this is the day.

Saturday the 25th continues the push, but it's dropping. Still a strong 8ft SW groundswell in the morning with clean offshore winds, dropping to a cleaner 5ft in the afternoon. Good, but not the standout.

Sunday the 26th offers a nice 6ft SW groundswell in the morning, glassy again. The afternoon drops to 4ft but with a very long 16-second period and clean cross-offshore breeze. That kind of period on a beach break can sometimes be a bit straight, but the conditions will be pristine.

We have a bit of a lull in quality early next week. Monday the 27th has 7ft swell but the wind picks up, making the surface lumpy. Tuesday the 28th is the next true standout. Morning brings a massive 12ft SW groundswell with a 15-second period. The energy reading is a staggering 5070. Offshore winds from the east. This is a serious, powerful groundswell. If you are an expert, get in the water. It's a big, clean, heavy wave. The afternoon stays big but gets a cross-onshore wind, so morning is the call.

The rest of the week stays windy and big, with strong breezes from the 29th to the 30th pushing 10ft SSW groundswell, but the wind will hold it back. Friday the 31st looks cleaner again, with a 8ft SSW groundswell and offshore winds in the morning, dropping to a glassy 6ft in the afternoon.

The first couple of days of August keep the good vibes going. Saturday the 1st has a clean 5ft SW groundswell, and Sunday the 2nd looks massive again, with a 8ft SW groundswell and a very long 17-second period. The morning will be clean with a cross-offshore breeze. That is a deep-water groundswell, perfect for the points if you are an expert.

Alright, so to wrap it up: Tuesday the 21st and Friday the 24th are your absolute standouts. Tuesday is the pick for intermediates looking for a clean, fun 6ft-8ft day. Friday the 24th is the one for experts wanting big, clean, powerful 10ft waves. If you can wait, Tuesday the 28th is the true beast of the run, but it's strictly for the experienced crew.

Stay safe out there.
Rusty.

Short Range Forecast

Some drizzle, heaviest during Sun afternoon. Very mild (max 17°C on Sat afternoon, min 11°C on Sun night). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Very mild (max 16°C on Thu afternoon, min 10°C on Tue night). Wind will be generally light.

Sat
18
Sunday
19
Monday
20
Tuesday
21
Wednesday
22
Thursday
23
Friday
24
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
1
1
2
3
3
1
3
4
4
3
1
0
3
3
2
7
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)
1
SW
13
1.4
SW
12
1.4
SW
12
1.9
SW
11
2.1
SW
10
1.7
SW
9
1.4
SW
8
0.8
SSW
16
1.9
SW
14
2.4
SW
14
2.3
SW
13
2.1
SW
12
2.1
SW
12
2.3
WSW
11
2.2
WSW
11
2.1
WSW
12
3.5
SW
16
3
SW
14
3
SW
14
3
SW
13
Wave Graph
Metric surfscale
Energy kJ
315
574
561
819
859
481
279
322
1428
2094
1645
1261
1293
1328
1162
1102
6307
3936
2995
2802
Wind (km/h)
10
WNW
10
N
15
N
5
SW
5
NE
5
N
5
WSW
0
NE
5
NNE
5
WSW
5
NNE
15
N
25
NNW
15
NNE
10
NNW
10
W
5
NNW
5
SSE
10
S
15
SSE
Wind State
on
cross-on
cross-on
cross-on
glassy
glassy
cross-on
glassy
glassy
glassy
cross
cross-on
cross-on
cross
cross-on
on
glassy
glassy
cross-off
cross-off
High Tide
6:19PM1.52m
6:38AM1.28m
7:01PM1.42m
7:23AM1.17m
7:45PM1.31m
8:15AM1.07m
8:37PM1.19m
9:22AM1.00m
9:43PM1.11m
10:48AM0.98m
11:05PM1.08m
12:11PM1.02m
00:19AM1.11m
Low Tide
00:39AM0.23m
12:39PM0.27m
1:24AM0.33m
1:21PM0.39m
2:14AM0.43m
2:09PM0.51m
3:14AM0.51m
3:14PM0.60m
4:34AM0.55m
4:48PM0.64m
5:57AM0.53m
6:16PM0.61m
part cloud
clear
part cloud
rain showers
clear
clear
clear
clear
clear
clear
clear
clear
clear
cloud
part cloud
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:47
7:46
7:46
7:45
7:45
7:43
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:57
5:57
5:58
5:59
5:59
6:00
6:00
 mm
1
Temp °C
17
15
14
15
14
13
14
13
13
14
13
13
15
14
15
16
14
15
17
16
Feels °C
16
14
12
14
14
12
12
12
12
12
13
9
10
10
14
14
14
15
15
15
  • 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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