Surf Forecasts:
Fish Boma surf forecast from 17 Aug 2026:
- Best quality surf: Monday 17 Aug, 11PM (local time) - 5.5ft (1.7m), 14s period, SW swell with cross-offshore winds.
- Most powerful swell: Thursday 20 Aug, 11AM (local time) - 11ft (3.5m), 13s period, SSW swell with 4,243 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 11PM (local time) - 5.5ft (1.7m), 14s period with SW swell.
Best Forecast Surf Conditions for Fish Boma this week:
The surf forecast for Fish Boma over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Aug 17) at 11PM. The primary swell is predicted to be 1.7m and 14s period with a secondary swell of 0.6m and 11s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Fish Boma in the next 16 days are 3.5m 13s and forecast to arrive on Thursday (Aug 20) at 11AM. 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+) | 11PM (Mon 17th Aug) | 5.5ft (1.7m) 14s |
| Best Surf | 11PM (Mon 17th Aug) | 5.5ft (1.7m) 14s |
| Most Powerful | 11AM (Thu 20th Aug) | 11ft (3.5m) 13s |
Table - best surf conditions forecast for Fish Boma over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break it down.
We’ve got a long run of swell ahead, and the first few days have surf, but the wind is gonna mess with it a bit. The real standouts are Thursday, August 20th, and then again right at the end of the month rolling into September.
Water temp is 58°, which is about 5° colder than normal for this time of year. That’s a big difference – you’ll want a thicker wetsuit.
Fish Boma is the only spot in the forecast. It’s a reef break, fairly consistent, and it picks up south swell best when the wind is from the south.
Monday, August 17th starts off with a gem. Morning is glassy, 7ft of SW swell with a long 13-second period. Combined energy is strong at 1788. The wind is dead calm – perfect, clean conditions. This is powerful reef surf, too big for beginners (over 5ft), but for the experienced, it’s a dream. Afternoon stays clean with 6ft and glassy winds.
Tuesday and Wednesday (18th and 19th) still have solid swell, 7ft to 8ft, but the wind goes cross-on. It’ll be a bit bumpy and choppy. Rideable but not pristine.
Then Thursday, August 20th – this is the big one. Morning has 12ft of SW swell, 13-second period, and glassy conditions. Energy is at 4381 – very strong. This is heavy, expert-only territory. Afternoon drops to 10ft, still clean-ish but with cross-shore wind.
Friday through Sunday (21st to 23rd) settles back to the 6ft to 8ft range, with mostly on or cross-on winds. Sunday afternoon, August 23rd is a good one: 7ft SW swell, 12 seconds, and glassy again. Clean conditions with moderate energy at 1229. A solid Sunday session.
The next week (24th to 29th) is a mix of 6ft to 8ft swell, but cross-on wind is persistent. Nothing special. A few sessions are okay, but not the best.
Wednesday, August 26th is worth a look – morning has 7ft SW swell, 13 seconds, and a clean cross-off wind. Nice, lined-up waves.
Then the big finish: Sunday, August 30th afternoon through Monday, August 31st brings another pulse of serious size. 12ft to 12ft SSW swell, with periods up to 14 seconds. Energy on Monday hits 5269 – very strong. The wind is cross-on and stronger, so it’ll be bumpy, but for big-wave hunters, this is the call. Experts only.
Finally, Tuesday, September 1st is a nice clean-up: 7ft SSW swell, clean cross-off wind, energy at 1961. Smooth and lined-up.
Crowds at Fish Boma can show up sometimes, especially on the glassy days, so plan accordingly.
Best picks: Monday, August 17th morning, Thursday, August 20th morning, and Sunday, August 23rd afternoon. The late-month swell on August 30th and 31st is for the brave. The rest is average but surfable. With this consistency, it won’t go flat for long.
Stay stoked.
Rusty.
Short Range ForecastMostly dry. Very mild (max 18°C on Mon afternoon, min 12°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 17°C on Sat afternoon, min 12°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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 14 | SW 13 | SW 12 | SW 13 | SW 12 | SW 12 | SW 12 | SSW 13 | SW 13 | SW 12 | SW 12 | SSW 12 | SW 11 | SW 11 | SSW 12 | SW 12 | SW 12 | SW 12 | SW 11 |
Wave Graph  | ||||||||||||||||||||
 kJ | 1182 | 1167 | 1339 | 1643 | 2381 | 1830 | 1693 | 1687 | 4243 | 3280 | 2001 | 1346 | 737 | 821 | 1103 | 2083 | 2130 | 1422 | 1208 | 802 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | cross-on | cross-on | cross-off | cross-on | cross-on | cross | cross-on | cross-on | cross-off | glassy | on | cross-off | cross-on | cross-on | cross-off | glassy | glassy | glassy |
High Tide | 6:27PM1.64m | 6:38AM1.41m | 6:58PM1.48m | 7:10AM1.26m | 7:31PM1.31m | 7:49AM1.12m | 8:20PM1.16m | 9:23AM1.00m | 10:47PM1.07m | 12:37PM1.04m | 00:51AM1.16m | 1:37PM1.19m | 1:41AM1.29m | |||||||
Low Tide | 00:40AM0.35m | 12:38PM0.38m | 1:11AM0.49m | 1:08PM0.53m | 1:49AM0.63m | 1:47PM0.68m | 2:58AM0.75m | 3:17PM0.82m | 6:04AM0.77m | 6:39PM0.79m | 7:27AM0.63m | 7:40PM0.65m | ||||||||
 |  |  | | | | |  | | | | | | | | | | | | | |
 | — | — | 7:03 | — | — | 7:03 | — | — | 7:01 | — | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — | — |
 | 5:59 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:02 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 18 | 15 | 16 | 15 | 14 | 16 | 17 | 14 | 15 | 15 | 13 | 16 | 16 | 13 | 16 | 17 | 15 | 17 | 16 | 14 |
Feels °C | 16 | 13 | 14 | 13 | 13 | 15 | 15 | 12 | 13 | 13 | 11 | 15 | 14 | 13 | 12 | 13 | 13 | 17 | 14 | 15 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 14 | SW 13 | SW 12 | SW 13 | SW 12 | SW 12 | SW 12 | SSW 13 | SW 13 | SW 12 | SW 12 | SSW 12 | SW 11 | SW 11 | SSW 12 | SW 12 | SW 12 | SW 12 | SW 11 |
| kJ | 1182 | 1167 | 1339 | 1643 | 2381 | 1830 | 1693 | 1687 | 4243 | 3280 | 2001 | 1346 | 737 | 821 | 1103 | 2083 | 2130 | 1422 | 1208 | 802 |
Swell 2 Height (m) Direction Period (s) | E 11 | E 11 | E 11 | E 10 | E 10 | E 10 | E 10 | E 9 | E 9 | E 9 | E 9 | E 9 | SW 11 | E 8 | E 8 | — | — | — | — | — |
| kJ | 110 | 81 | 55 | 32 | 31 | 30 | 16 | 16 | 6 | 6 | 6 | 6 | 341 | 1 | 1 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | E 8 | E 9 | E 8 | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 6 | 6 | 6 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | SW 7 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | 214 | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 3 | 3 | 16 | 0 | 3 | 3 | 1 | 3 | 16 | 0 | 0 | 40 | 0 | 3 | 3 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Garden Route | ||||||||||||||||||||
Best forecast wave conditions in South Africa | ||||||||||||||||||||
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Information about the Fish Boma Surf forecast
The above surf forecast table for Fish Boma provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Fish Boma can be found by selecting the local surf guide option on the grey menu. Our Fish Boma 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 (Fish Boma) 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 Fish Boma 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.
Are you planning a holiday in Garden Route? If you are looking for accommodation near Fish Boma, camping, hotels and holiday cottages in Garden Route, consider staying in Knysna which is 10 km (6 miles) away. Other places in and around Garden Route where you can find information about places to rent, and car hire include Plettenberg Bay which is 39 km (24 miles) away, George, Mossel Bay and Oudtshoorn.
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