Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 21 Jul 2026:
- Best quality surf: Tuesday 28 Jul, 5AM (local time) - 8ft (2.5m), 10s period, E swell with offshore winds.
- Most powerful swell: Saturday 25 Jul, 2PM (local time) - 11ft (3.5m), 9s period, E swell with 1,834 kJ wave energy.
- Next surfable swell (1★+): Tuesday 28 Jul, 2AM (local time) - 7ft (2.1m), 10s period with ESE swell.
Best Forecast Surf Conditions for Nanwan Beach (South Bay) this week:
The surf forecast for Nanwan Beach (South Bay) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Jul 28) at 2AM. The primary swell is predicted to be 2.1m and 10s period with a secondary swell of 1.1m and 10s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Nanwan Beach (South Bay) in the next 16 days are 3.5m 9s and forecast to arrive on Saturday (Jul 25) at 2PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 7s period and expected on Saturday (Jul 25) at 5AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Tue 28th Jul) | 7ft (2.1m) 10s |
| Best Surf | 5AM (Tue 28th Jul) | 8ft (2.5m) 10s |
| Most Powerful | 2PM (Sat 25th Jul) | 11ft (3.5m) 9s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, this is Rusty. Let's get straight into it.
Right now, the surf is pretty flat. We're looking at a long, slow start with nothing worth paddling out for from Tuesday the 21st right through to Friday the 24th. The swell is tiny, weak, and the wind isn't doing us any favours. It's a bit of a dead spell for Nanwan Beach (South Bay).
Saturday the 25th sees a big jump in swell, but it's a mess. A 10ft easterly swell hits with a short 9-second period, and the combined energy is a massive 1564, but the wind is howling from the NE at 28 mph. That's a strong breeze turning the ocean into a washing machine. It's a pass for paddle surfing; this setup looks more interesting for kite surfing.
The start of the following week, Monday the 27th, things get a little more interesting. We've got a 4ft to 5ft groundswell from the SW with a 10-second period, and the wind finally eases off. The water temp is around 85°, which is about average for this time of year. The combined energy is moderate at 480 to 517. It's still only marginal, but it's the first sign of life.
Now, the real standout comes on Tuesday the 28th. There's a solid 8ft easterly swell with a 10-second period, and the combined energy is a strong 2530. The wind is offshore from the WNW at 16 mph, promising clean conditions. This is a bigger swell, best for the more experienced crew. It's the best session on offer in the first week.
Later in the forecast period, we've got a massive pulse coming in on Wednesday the 5th of August. A 13ft SW groundswell with a 10-second period and a combined energy of 2876. The wind is cross-off, but the energy is just insane. For a beach and reef setup, this is going to be far too big and dangerous for most. Only for experts, and even then, it's a wild card.
The rest of the period is a mix of lumpy cross-shore winds and jumbled swell, with a few marginal windows but nothing that really stands out. The best of the 16-day window is the Tuesday the 28th for clean, strong waves, and the Monday the 27th as a warm-up session.
Rusty.
Short Range ForecastMostly dry. Warm (max 30°C on Fri morning, min 28°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 10mm), heaviest on Sat night. Warm (max 30°C on Fri afternoon, min 27°C on Sat night). Winds increasing (light winds from the N on Fri afternoon, strong winds from the ENE by Sat afternoon). | |||||||||||||||||||
Tue 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | ||||||||||||||
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 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | E 9 | E 9 | ESE 9 | SSW 10 | SSW 10 | SW 10 | SW 9 | SW 10 | ESE 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 89 | 60 | 49 | 42 | 30 | 30 | 30 | 23 | 16 | 12 | 7 | 1556 | 1535 | 732 | 678 | 565 | 479 | 294 | 327 | 916 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-on | cross-off | cross-off | cross-off | cross-off | cross | cross | cross | cross | cross | cross-off | cross-off | cross-off |
High Tide | 00:40AM0.86m | 12:53PM0.55m | 1:33AM0.92m | 3:19PM0.48m | 2:28AM0.96m | 3:22AM1.01m | 4:12AM1.07m | 6:57PM0.52m | 4:58AM1.12m | 7:11PM0.53m | ||||||||||
Low Tide | 5:34PM0.40m | 7:58AM0.44m | 5:44PM0.44m | 9:54AM0.38m | 5:47PM0.47m | 11:05AM0.30m | 11:49AM0.23m | 12:24PM0.18m | 9:09PM0.50m | 12:56PM0.14m | 10:13PM0.47m | |||||||||
 |  | | | | | | | |  |  | |  |  | | | | | | | |
 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | 5:26 | — | — |
 | 6:40 | — | — | 6:40 | — | — | 6:40 | — | — | 6:39 | — | — | 6:39 | — | — | 6:38 | — | — | 6:38 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 7 | 2 | — | — | — | — | 3 |
Temp °C | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 29 | 30 | 30 | 28 | 30 | 30 | 28 | 29 | 29 | 28 | 29 | 30 | 28 |
Feels °C | 31 | 32 | 33 | 31 | 31 | 32 | 31 | 33 | 33 | 33 | 28 | 26 | 26 | 25 | 27 | 28 | 28 | 30 | 32 | 30 |
Swell 1 Height (m) Direction Period (s) | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 8 | SW 8 | SW 8 | SSW 10 | SSW 10 | SW 10 | SW 9 | SW 10 | ESE 10 |
| kJ | 89 | 60 | 49 | 42 | 30 | 30 | 30 | 23 | 16 | 12 | 7 | 3 | 2 | 3 | 678 | 565 | 479 | 294 | 327 | 916 |
Swell 2 Height (m) Direction Period (s) | ENE 10 | ENE 10 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 10 | E 10 | E 17 | E 16 | E 16 | E 16 | ENE 10 | E 15 | SE 9 | SE 8 | SE 10 | SW 10 |
| kJ | 18 | 18 | 17 | 17 | 17 | 16 | 16 | 16 | 22 | 8 | 6 | 5 | 5 | 5 | 18 | 4 | 76 | 29 | 25 | 207 |
Swell 3 Height (m) Direction Period (s) | ESE 8 | SE 8 | SE 8 | E 9 | E 9 | E 10 | E 10 | ENE 12 | E 10 | ESE 10 | — | — | — | E 16 | E 15 | ENE 9 | ESE 11 | SE 10 | SE 8 | — |
| kJ | 6 | 2 | 2 | 7 | 2 | 8 | 8 | 13 | 7 | 10 | — | — | — | 5 | 4 | 17 | 22 | 27 | 16 | — |
Wind waves Height (m) Direction Period (s) | — | — | — | WSW 2 | — | — | — | — | NE 3 | ENE 4 | ENE 6 | E 9 | E 9 | ESE 9 | ESE 8 | ESE 8 | ENE 5 | ENE 6 | E 6 | NE 6 |
| kJ | — | — | — | 1 | — | — | — | — | 2 | 27 | 451 | 1556 | 1535 | 732 | 373 | 234 | 94 | 130 | 149 | 142 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 14 | 2 | 2 | 14 | 922 | 2 | 2 | 329 | 693 | 693 | 329 | 449 | 449 | 329 | 676 | 676 | 316 | 676 | 996 | 0 |
Best forecast wave conditions in South Taiwan | ||||||||||||||||||||
Best forecast wave conditions in Taiwan | ||||||||||||||||||||
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Information about the Nanwan Beach (South Bay) Surf forecast
The above surf forecast table for Nanwan Beach (South Bay) provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Nanwan Beach (South Bay) can be found by selecting the local surf guide option on the grey menu. Our Nanwan Beach (South 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 (Nanwan Beach (South 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 Nanwan Beach (South 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.
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