
Surf Forecasts:
Big Bay surf forecast from 21 Jul 2026:
- Best quality surf: Thursday 23 Jul, 11PM (local time) - 13ft (4.0m), 17s period, SW swell with offshore winds.
- Most powerful swell: Thursday 23 Jul, 11PM (local time) - 13ft (4.0m), 17s period, SW swell with 9,317 kJ wave energy.
- Next surfable swell (1★+): Tuesday 21 Jul, 8PM (local time) - 8ft (2.5m), 13s 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 Tuesday (Jul 21) at 8PM. The primary swell is predicted to be 2.5m and 13s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Big Bay in the next 16 days are 4.0m 17s and forecast to arrive on Thursday (Jul 23) at 11PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 6s period and expected on Monday (Jul 27) at 5AM.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Tue 21st Jul) | 8ft (2.5m) 13s |
| Best Surf | 11PM (Thu 23rd Jul) | 13ft (4.0m) 17s |
| Most Powerful | 11PM (Thu 23rd Jul) | 13ft (4.0m) 17s |
Table - best surf conditions forecast for Big Bay over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about what’s coming up for Big Bay.
We’ve got a solid run of surf on the way, but it’s not all smooth sailing. The first real action kicks off on Tuesday morning, the 21st of July. The water is sitting at 57°, which is a bit colder than normal for this time of year, so you’ll want a decent wetsuit.
Tuesday morning is the first standout. It’s glassy, with a clean 7ft SW swell and a solid 14-second period. The energy is pumping with a reading of 1946 (moderate wave energy). This is excellent for experienced surfers, but with that size and power, it’s not one for beginners. The wind is calm, so expect some really clean, lined-up sets.
From Tuesday afternoon through to Thursday, things get a bit messy. The wind switches around and kicks up some chop, and the wave quality drops off. The swell hangs in there, but the conditions are marginal. It’s worth sitting out these days unless you’re desperate.
Then we hit the real highlight of the outlook. Friday morning, the 24th of July, is the best on offer. That’s an 12ft SW groundswell with a very long 15-second period, and the combined energy is a massive 4815 (strong wave energy). The wind is glassy again. This is a big, powerful swell. For a point break or reef, this would be a dream, but at a beach break like Big Bay, that long period can make it break a bit straight. Still, for experienced surfers, this is a special session. The afternoon stays clean with a cross-offshore breeze.
The weekend of the 25th and 26th keeps the quality high. Saturday morning is clean with offshore wind and an 8ft SW swell. Sunday morning is another glassy moment, with a 7ft SW swell. Both days are excellent for experienced surfers, and the crowds are likely at Big Bay, so get there early.
Monday the 27th sees the wind pick up, and by Tuesday the 28th, a strong breeze makes it a write-off for surfing, despite more big swell. That setup looks more interesting for kite surfing than paddle surfing.
We get a bit of a breather, but then Wednesday the 29th morning brings back clean conditions with a 10ft SW swell and offshore wind. Another good one for the experienced crew.
The first week of August drops off hard. The wind is onshore and strong, the swell gets smaller and from the south, and the scores are poor. There’s a gap of poor surf from the 2nd to the 3rd of August.
Things start to look up again on Tuesday the 4th of August, with a clean afternoon showing a 6ft WSW swell and cross-offshore wind. Then Wednesday the 5th morning is clean with offshore wind and a 5ft WSW swell, good for a wider range of surfers.
Overall, the standout is that Friday morning, the 24th of July. Don’t miss it.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Thu morning. Very mild (max 14°C on Tue afternoon, min 10°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 21°C on Sat afternoon, min 12°C on Fri morning). Wind will be generally light. | ||||||||||||||||||||
Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | SW 14 | SW 13 | SW 13 | SW 12 | SW 12 | WSW 12 | SW 11 | SW 11 | SW 16 | SW 15 | SW 14 | SW 13 | SW 13 | SW 12 | SW 12 | SW 12 | SW 12 | WSW 11 | WSW 12 | SSW 14 | SSW 16 |
Wave Graph | |||||||||||||||||||||
1895 | 2310 | 1724 | 1298 | 1048 | 861 | 901 | 1279 | 8055 | 4815 | 3936 | 2412 | 2187 | 1749 | 1200 | 1193 | 1111 | 669 | 412 | 2698 | 4821 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross | glassy | on | cross-on | cross | cross | cross | off | glassy | cross-off | off | off | cross-off | cross-off | glassy | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 8:15AM1.07m | 8:37PM1.19m | 9:22AM1.00m | 9:43PM1.11m | 10:48AM0.98m | 11:05PM1.08m | 12:11PM1.02m | 00:19AM1.11m | 1:10PM1.09m | 1:14AM1.17m | 1:53PM1.18m | 1:56AM1.25m | 2:29PM1.27m | 2:33AM1.32m | |||||||
Low Tide | 2:09PM0.51m | 3:14AM0.51m | 3:14PM0.60m | 4:34AM0.55m | 4:48PM0.64m | 5:57AM0.53m | 6:16PM0.61m | 6:58AM0.46m | 7:16PM0.54m | 7:43AM0.38m | 7:59PM0.45m | 8:20AM0.30m | 8:36PM0.38m | ||||||||
7:46 | — | — | 7:45 | — | — | 7:45 | — | — | 7:43 | — | — | 7:43 | — | — | 7:43 | — | — | 7:41 | — | — | |
— | 5:59 | — | — | 5:59 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:02 | — | |
mm | — | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 14 | 13 | 13 | 14 | 13 | 11 | 13 | 13 | 13 | 15 | 14 | 16 | 21 | 20 | 20 | 18 | 14 | 16 | 17 | 14 |
Feels °C | 13 | 12 | 12 | 11 | 11 | 11 | 6 | 10 | 12 | 12 | 13 | 12 | 14 | 19 | 18 | 19 | 16 | 12 | 12 | 11 | 7 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 13 | SW 13 | SW 12 | SW 12 | WSW 12 | SW 11 | SW 11 | SW 16 | SW 15 | SW 14 | SW 13 | SW 13 | SW 12 | SW 12 | SW 12 | SW 12 | WSW 11 | SW 11 | WSW 12 | — |
1895 | 2310 | 1724 | 1298 | 1048 | 861 | 901 | 1279 | 8055 | 4815 | 3936 | 2412 | 2187 | 1749 | 1200 | 1193 | 1111 | 669 | 344 | 83 | — | |
Swell 2 Height (m) Direction Period (s) | W 9 | W 9 | — | SSW 15 | SSW 14 | SSW 12 | WSW 12 | SW 20 | — | — | — | — | SSW 13 | — | SSW 12 | SW 14 | S 11 | SW 13 | WSW 12 | — | — |
39 | 24 | — | 42 | 115 | 254 | 196 | 1081 | — | — | — | — | 577 | — | 203 | 132 | 21 | 231 | 412 | — | — | |
Swell 3 Height (m) Direction Period (s) | WSW 11 | — | — | — | — | — | SW 23 | WSW 13 | — | — | — | — | — | — | — | — | SW 20 | SW 17 | SW 15 | — | — |
12 | — | — | — | — | — | 21 | 133 | — | — | — | — | — | — | — | — | 15 | 77 | 370 | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | NNW 4 | NW 5 | — | — | — | — | — | — | — | — | — | — | S 6 | S 6 | SSW 14 | SSW 16 |
— | — | — | — | — | 15 | 76 | — | — | — | — | — | — | — | — | — | — | 85 | 61 | 2698 | 4821 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 29 | 34 | 2 | 36 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 14 | 0 | 166 | 130 |
Best forecast wave conditions in Cape Town | |||||||||||||||||||||
Best forecast wave conditions in South Africa | |||||||||||||||||||||
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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.










