
Surf Forecasts:
Big Bay surf forecast from 16 Jul 2026:
- Best quality surf: Thursday 23 Jul, 8PM (local time) - 11ft (3.5m), 13s period, SW swell with glassy winds.
- Most powerful swell: Wednesday 22 Jul, 5AM (local time) - 15ft (4.5m), 13s period, WSW swell with 5,989 kJ wave energy.
- Next surfable swell (1★+): Thursday 16 Jul, 8PM (local time) - 7ft (2.1m), 12s 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 Thursday (Jul 16) at 8PM. The primary swell is predicted to be 2.1m and 12s 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 4.5m 13s and forecast to arrive on Wednesday (Jul 22) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (SAST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Thu 16th Jul) | 7ft (2.1m) 12s |
| Best Surf | 8PM (Thu 23rd Jul) | 11ft (3.5m) 13s |
| Most Powerful | 5AM (Wed 22nd Jul) | 15ft (4.5m) 13s |
Table - best surf conditions forecast for Big Bay over the next 16 days.
The Lowdown
G’day, Rusty here, looking at the next 16 days for Big Bay. This spot is an exposed intermediate zone, and it’s in for a proper ride. The water’s a bit colder than normal for this time of year, sitting at 56°, so you’ll want a decent spring suit.
We’ve got a building swell story starting right now. Thursday morning, 16 July, is the first real offering. The swell is a solid 8ft out of the SW, with a long 13-second period, and the combined energy is pumping hard at 2381. The wind is glassy, so it’s going to be clean. But at this size, it’s already pushing into expert territory, so only for the experienced crew. The afternoon takes a bit of a dip with a cross breeze, so grab the morning.
Friday morning, 17 July, the swell drops to 6ft from the SW, period still a nice 11 seconds, and energy at 773. Glassy wind again, making for very good conditions. This is a better size for intermediates. Friday afternoon gets cross-shore, so not as good.
Saturday morning, 18 July, we’re down to 5ft SW, 10-second period, but still glassy. It’s a smaller, clean day, good for a longboard or a funboard. The energy is a moderate 643. Saturday afternoon picks up a little cross-on breeze.
Sunday morning, 19 July, is a bit bumpy with a cross-on breeze, but the swell is 5ft SW with a 12-second period and 900 energy. Sunday afternoon saves the day with glassy conditions again on the same size swell. That’s your pick for the weekend.
Monday and Tuesday are a write-off. Monday morning has a tiny 3ft swell, then Tuesday gets hammered by a strong 22-25 mph wind, with a massive 13ft WSW swell on Tuesday afternoon and energy screaming up to 5222. That’s a no-go for surfing, looks more like a kite session.
The real standout is Thursday, 23 July. The morning is too big at 15ft SW, but the afternoon is the magic window. The swell drops to 13ft SW, same 14-second period, the wind goes glassy, and the energy is a massive 6802. The file says it’s exceptional for expert surfers, and trust me, that’s the one to circle. Still, that’s only for the big-wave chargers.
Then we get to Saturday, 25 July. This is the absolute best on offer. The morning is a dream: 13ft SW, a very long 17-second period, glassy cross-off wind, and the energy is an insane 9408. This is a once-in-a-forecast kind of setup. The swell direction matches the optimum SW, and the wind is clean. This is a world-class day for experts at Big Bay. The afternoon picks up a stronger breeze, so get in early.
The following week, from 26 July, we see a steady drop in size. Sunday and Monday have 8ft to 6ft SW swell, with clean cross-off winds and moderate energy. Good for experienced surfers, but nothing like the 25th.
Wednesday, 29 July, has a small 6ft set with zero wind in the morning, glassy as a mirror. A nice easy day.
The last few days of the month fade out with small, weak swell and some stronger winds, so it’s a quiet end to the outlook.
The big call: Saturday, 25 July morning is the holy grail of this window. Huge, clean, powerful. If you can handle it, that’s the session.
Rusty.
Short Range ForecastMostly dry. Very mild (max 17°C on Fri afternoon, min 13°C on Sun morning). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Tue night. Very mild (max 15°C on Sun afternoon, min 11°C on Mon morning). Winds increasing (calm on Mon morning, fresh winds from the NNW by Tue night). | |||||||||||||||||||
Thu 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | ||||||||||||||
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 13 | SW 12 | SW 11 | SW 11 | SW 10 | SW 9 | SW 13 | SW 12 | SW 12 | SW 11 | SW 11 | SSW 9 | SW 9 | SW 16 | SW 14 | SW 13 | SW 12 | WSW 13 | WSW 13 | SW 12 |
Wave Graph | ||||||||||||||||||||
1671 | 1169 | 773 | 635 | 377 | 321 | 310 | 465 | 711 | 743 | 716 | 333 | 156 | 258 | 1170 | 1242 | 4401 | 5664 | 4112 | 1928 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | glassy | cross | glassy | glassy | glassy | cross-on | cross-on | cross | off | glassy | cross-on | glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross |
High Tide | 4:55PM1.63m | 5:12AM1.48m | 5:37PM1.59m | 5:55AM1.39m | 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 | |||||||
Low Tide | 11:11PM0.09m | 11:20AM0.07m | 11:55PM0.15m | 12:00PM0.16m | 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 | |||||||
— | — | 7:48 | — | — | 7:47 | — | — | 7:47 | — | — | 7:46 | — | — | 7:46 | — | — | 7:45 | — | — | |
5:54 | — | — | 5:55 | — | — | 5:57 | — | — | 5:57 | — | — | 5:58 | — | — | 5:59 | — | — | 5:59 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 2 | — | — |
Temp °C | 15 | 14 | 15 | 17 | 16 | 16 | 17 | 16 | 15 | 15 | 15 | 13 | 14 | 13 | 14 | 15 | 14 | 15 | 16 | 16 |
Feels °C | 14 | 14 | 15 | 17 | 16 | 16 | 16 | 16 | 13 | 14 | 14 | 12 | 12 | 12 | 12 | 12 | 10 | 11 | 11 | 14 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 12 | SW 11 | SW 11 | SW 10 | SW 9 | SW 9 | SW 12 | SW 12 | SW 11 | SW 11 | SSW 9 | SW 9 | SW 12 | SW 14 | SW 13 | SW 12 | WSW 13 | WSW 13 | SW 12 |
1671 | 1169 | 773 | 635 | 377 | 321 | 211 | 465 | 711 | 743 | 716 | 333 | 155 | 146 | 1170 | 1242 | 4401 | 5664 | 4112 | 1928 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | S 13 | S 12 | SW 13 | WSW 11 | W 11 | W 10 | W 10 | SW 11 | SW 10 | SW 16 | W 9 | — | — | — | — | WSW 13 |
— | — | — | — | 52 | 129 | 310 | 198 | 143 | 96 | 123 | 194 | 156 | 258 | 39 | — | — | — | — | 1092 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | SW 16 | SW 14 | S 11 | S 10 | SSE 10 | SSE 10 | SSW 12 | W 10 | S 9 | W 9 | WSW 11 | — | — | — | — | — |
— | — | — | — | 10 | 189 | 110 | 94 | 36 | 19 | 155 | 121 | 71 | 58 | 48 | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NNW 4 | WNW 7 | WNW 8 | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | 23 | 938 | 545 | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 14 | 0 | 0 | 14 | 0 | 0 | 29 | 4 | 2 | 0 | 0 | 0 | 29 | 2 | 232 | 274 | 323 | 323 | 342 |
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.










