Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 27 Aug 2026:
- Best quality surf: Tuesday 1 Sep, 5AM (local time) - 6ft (1.8m), 10s period, SW swell with cross-offshore winds.
- Most powerful swell: Wednesday 2 Sep, 5AM (local time) - 7ft (2.2m), 10s period, SW swell with 918 kJ wave energy.
- Next surfable swell (1★+): Saturday 29 Aug, 2AM (local time) - 6ft (1.8m), 9s period with SW 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 Saturday (Aug 29) at 2AM. The primary swell is predicted to be 1.8m and 9s period. 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 2.2m 10s and forecast to arrive on Wednesday (Sep 02) at 5AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.4m 8s period and expected on Wednesday (Sep 02) at 2PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Sat 29th Aug) | 6ft (1.8m) 9s |
| Best Surf | 5AM (Tue 1st Sep) | 6ft (1.8m) 10s |
| Most Powerful | 5AM (Wed 2nd Sep) | 7ft (2.2m) 10s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Right, gather 'round, grab a seat. Rusty here, and I've gotta be straight with you – the next couple of weeks are looking pretty grim for a proper paddle. We've got one spot on the radar, Nanwan Beach (South Bay), but it's a tale of two halves. The water's sitting at a balmy 84°F, which is bang on average for this time of year, so at least you won't be freezing while you're sitting there waiting for something decent.
The outlook starts on Thursday the 27th of August, but don't get excited. We've got a 7ft SW swell rolling in, but the wind is a nasty cross-off from the west at 22 mph, and there's a storm risk. The energy is there (568), but it's just messy. The forecast keeps repeating this pattern through Friday the 28th – same swell size, same poor conditions. It's a real shame.
We finally get a glimmer of hope on Saturday the 29th. The morning is still a bit dodgy with a cross-shore wind, but by Saturday afternoon, the wind drops to a light breeze from the west at 6 mph, switching to a clean cross-off. The swell is a touch smaller at 7ft from the SSW with a 9-second period, but the energy is solid (608). It's going to be the best of a bad bunch, but it's still only a 2 out of 10.
Sunday the 30th and Monday the 31st are a write-off again – wind picks up from the ENE, and the surf goes back to poor. The conditions are a mess. Tuesday the 1st of September is a bit of a tease. The morning remains marginal thanks to a moderate breeze, but by Tuesday afternoon, the wind drops to a light, clean cross-off from the NNE at 6 mph. The swell holds at 6ft from the SW with a 10-second period, and the energy is okay (583). It's clean, but not exactly pumping.
Then, Wednesday the 2nd of September brings a jump in energy – we're talking 1009 and 1067 – but the wind turns onshore and cross-shore, making it lumpy and choppy. The swell is 7ft to 8ft, which is pushing into intermediate territory, but the wind ruins it. Thursday the 3rd is more of the same with strong, clean cross-off winds but a big bump in energy to 1216 with a 8ft SSW swell. The forecast calls it marginal, and honestly, for a beach and reef setup, that much energy with a strong wind is a pass for me.
After the 4th of September, the whole thing falls apart. Swell drops to under 3ft, and we're looking at a long stretch of tiny, weak surf. From the 4th of September right through to the 11th of September, the energy levels are pathetic, mostly under 200, and the waves are tiny. There's a moment on the 5th of September with a light offshore wind and a 3ft swell, but it's just "surfable" – not worth a drive. The 7th of September goes glassy, but the swell is only 2ft. It's a flat spell, plain and simple.
So, the only real standout, and I'm being generous, is late Saturday afternoon the 29th of August. The clean cross-off and light wind make it the most surfable window. Tuesday the 1st of September afternoon is the second option. Don't get your hopes up for anything else. The rest of the 16 days is a long, quiet gap with no real recommendations. A blank run like this is pretty normal for the area when the patterns don't line up. Forecasts can change, but right now, I'd be looking for a different hobby for a while.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Thu morning. Warm (max 29°C on Fri afternoon, min 28°C on Thu morning). Winds decreasing (fresh winds from the W on Thu afternoon, calm by Sat night). | Days 4-6 Weather SummaryModerate rain (total 12mm), heaviest on Tue night. Warm (max 29°C on Sun morning, min 26°C on Mon night). Mainly fresh winds. | ||||||||||||||||||||
Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | |||||||||||||||
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 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 9 | SSW 9 | SSW 9 | SW 9 | SW 9 | SW 10 | SW 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SSW 10 |
Wave Graph | |||||||||||||||||||||
637 | 619 | 530 | 542 | 505 | 481 | 645 | 591 | 528 | 563 | 725 | 599 | 476 | 612 | 535 | 575 | 612 | 849 | 739 | 592 | 661 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross | cross | cross | cross | cross | cross | cross-off | cross | cross | cross-off | cross-off | cross-off | cross-off |
High Tide | 7:06PM0.64m | 6:38AM1.18m | 7:26PM0.70m | 7:13AM1.14m | 7:49PM0.76m | 7:48AM1.08m | 8:14PM0.84m | 8:25AM0.98m | 8:42PM0.91m | 9:04AM0.86m | 9:15PM0.97m | 9:49AM0.72m | 9:55PM1.02m | ||||||||
Low Tide | 1:18PM0.14m | 11:51PM0.35m | 1:39PM0.15m | 00:35AM0.30m | 2:00PM0.18m | 1:18AM0.26m | 2:19PM0.22m | 2:05AM0.24m | 2:38PM0.27m | 2:55AM0.24m | 2:56PM0.32m | 3:54AM0.26m | 3:13PM0.37m | ||||||||
5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | |
— | 6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — | — | 6:12 | — | |
mm | 2 | 1 | — | — | — | 1 | 1 | — | 2 | — | — | 1 | — | — | — | — | 2 | 9 | 14 | 10 | — |
Temp °C | 28 | 28 | 28 | 28 | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 27 | 29 | 29 | 27 | 26 | 26 | 26 |
Feels °C | 29 | 27 | 29 | 28 | 30 | 31 | 33 | 32 | 35 | 30 | 30 | 29 | 30 | 27 | 26 | 31 | 31 | 29 | 28 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | NE 12 | NE 11 | NNE 11 | ENE 13 | SW 8 | SW 9 | SSW 9 | SSW 9 | SW 9 | SW 9 | SW 10 | SW 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SSW 10 |
106 | 59 | 47 | 55 | 505 | 481 | 645 | 591 | 528 | 563 | 725 | 599 | 476 | 612 | 535 | 575 | 612 | 849 | 739 | 592 | 661 | |
Swell 2 Height (m) Direction Period (s) | ENE 14 | ENE 13 | ENE 13 | NNE 11 | ENE 12 | ENE 12 | ENE 12 | ENE 12 | ENE 13 | ENE 8 | ENE 13 | ENE 12 | SSE 6 | ENE 10 | E 11 | E 10 | ENE 10 | ENE 11 | NE 11 | NE 12 | NE 12 |
39 | 35 | 58 | 11 | 30 | 28 | 28 | 28 | 101 | 19 | 55 | 115 | 14 | 173 | 229 | 320 | 222 | 214 | 297 | 481 | 494 | |
Swell 3 Height (m) Direction Period (s) | ENE 11 | E 9 | ESE 10 | ESE 10 | ESE 10 | SE 10 | ENE 15 | SSE 9 | SE 9 | ENE 13 | SE 9 | SE 11 | SSE 6 | SE 7 | ENE 11 | SE 10 | SSE 9 | NW 7 | NW 7 | SSE 10 | SE 10 |
22 | 7 | 10 | 9 | 9 | 4 | 21 | 7 | 12 | 58 | 12 | 5 | 20 | 49 | 286 | 15 | 8 | 79 | 44 | 9 | 14 | |
Wind waves Height (m) Direction Period (s) | SW 8 | SW 8 | SW 8 | SW 8 | — | — | — | — | — | — | ENE 7 | ENE 3 | ENE 5 | ENE 10 | E 7 | WSW 4 | W 4 | NW 7 | NW 8 | NW 8 | NW 6 |
637 | 619 | 530 | 542 | — | — | — | — | — | — | 30 | 4 | 159 | 610 | 206 | 29 | 16 | 160 | 333 | 435 | 263 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 335 | 42 | 42 | 42 | 42 | 0 | 2 | 0 | 79 | 79 | 1160 | 535 | 693 | 348 | 348 | 42 | 535 | 148 | 390 | 406 | 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.











