Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 24 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 5PM (local time) - 7.5ft (2.3m), 17s period, E swell with cross-offshore winds.
- Most powerful swell: Tuesday 25 Aug, 2PM (local time) - 7.5ft (2.3m), 17s period, E swell with 3,085 kJ wave energy.
- Next surfable swell (1★+): Tuesday 25 Aug, 5PM (local time) - 7.5ft (2.3m), 17s period with E 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 (Aug 25) at 5PM. The primary swell is predicted to be 2.3m and 17s period with a secondary swell of 1.9m and 8s. 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 2.3m 17s and forecast to arrive on Tuesday (Aug 25) at 2PM. 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 16s period and expected on Tuesday (Aug 25) at 8PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Tue 25th Aug) | 7.5ft (2.3m) 17s |
| Best Surf | 5PM (Tue 25th Aug) | 7.5ft (2.3m) 17s |
| Most Powerful | 2PM (Tue 25th Aug) | 7.5ft (2.3m) 17s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Right, let’s take a look at the next couple of weeks down here. The early part is a write-off, I’m afraid. We’ve got a solid run of poor conditions, with a couple of days that look more interesting for kite surfing than for paddle surfing, particularly around the 28th of August when the swell pushes over 10ft and the wind is howling near gale force. The good news is it doesn’t usually stay this grim for long, and there is a flicker of something decent on the horizon.
The first real chance to get wet is on Tuesday morning, 25 August. Nanwan Beach (South Bay) picks up a 7ft swell from the east with a very long period of 18 seconds – that’s proper groundswell energy. The wind is cross-offshore and clean, and the combined swell energy is a strong 3319, which tells you there’s real power behind it. The water is a warm 84°, which is pretty much bang on average for this time of year. That afternoon the wind stays clean and the swell bumps up to 8ft, still out of the east with a 17-second period and 3489 energy. This is easily the best window in the whole outlook – clean, powerful, and offering some proper waves for experienced surfers. Be aware, with such a long period, it might be a bit straight at the beach, so keep your eyes peeled for a corner.
After that, it’s back to messy, wind-affected, and onshore for days. The wind just won’t play ball, and we creep through a real dry spell until we get to Saturday, 5 September. That morning we see a 10ft swell from the southwest with a 12-second period, but the wind is cross-shore and lumpy. The energy is strong at 4006, but it’s not clean enough to get excited about, and the size is edging into expert-only territory.
Then there’s Sunday morning, 6 September. This is the standout in the second week, but it’s a long way off. The swell is 12ft from the southwest with a 12-second period, and the combined energy is a massive 3107. The wind is cross-shore and the forecast says the swell is predicted to be too big for this break. That’s a lot of water moving, and it’ll be a heavy, powerful beast. Only for the experienced, and even then, it’s a serious call. The afternoon on the 6th drops to 10ft with a clean cross-offshore wind, but the energy is still over 1800.
The real takeaway is that Tuesday, 25 August, is your window. The rest of the run is either blown out, too big, or just plain messy. Keep an eye on the 6th, but don’t hold your breath.
Rusty.
Short Range ForecastHeavy rain (total 137mm), heaviest during Mon morning. Warm (max 28°C on Tue night, min 26°C on Mon morning). Winds increasing (light winds from the NW on Tue night, fresh winds from the WNW by Wed night). | Days 4-6 Weather SummaryHeavy rain (total 25mm), heaviest during Fri night. Warm (max 29°C on Fri morning, min 26°C on Fri night). Winds decreasing (near gales from the W on Fri morning, light winds from the ESE by Sat night). | ||||||||||||||||||||
Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | |||||||||||||||
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 | E 17 | E 18 | E 17 | SW 9 | SW 9 | SW 8 | SW 9 | SW 9 | SW 8 | SW 8 | SW 8 | WSW 8 | SSW 9 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SW 10 | SW 10 |
Wave Graph | |||||||||||||||||||||
836 | 702 | 855 | 2703 | 2980 | 505 | 588 | 625 | 493 | 408 | 734 | 1001 | 1282 | 713 | 1178 | 1199 | 1440 | 1124 | 1170 | 899 | 710 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-on | cross-on | cross-on | cross-on | cross | cross |
High Tide | 6:41PM0.54m | 4:42AM1.09m | 6:38PM0.56m | 5:24AM1.14m | 6:49PM0.59m | 6:02AM1.17m | 7:06PM0.64m | 6:38AM1.18m | 7:26PM0.70m | 7:13AM1.14m | 7:49PM0.76m | 7:48AM1.08m | 8:14PM0.84m | ||||||||
Low Tide | 12:05PM0.19m | 9:07PM0.52m | 12:31PM0.16m | 10:17PM0.46m | 12:55PM0.14m | 11:07PM0.40m | 1:18PM0.14m | 11:51PM0.35m | 1:39PM0.15m | 00:35AM0.30m | 2:00PM0.18m | 1:18AM0.26m | 2:19PM0.22m | 2:05AM0.24m | |||||||
5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:39 | — | — | |
— | 6:21 | — | — | 6:20 | — | — | 6:19 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:15 | — | |
mm | 64 | 26 | 21 | 12 | 2 | 1 | 3 | 3 | 5 | 2 | — | 1 | — | 1 | 7 | 5 | 2 | 7 | 5 | — | 13 |
Temp °C | 26 | 27 | 27 | 27 | 26 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 27 |
Feels °C | 27 | 27 | 30 | 29 | 28 | 31 | 30 | 29 | 30 | 27 | 27 | 26 | 25 | 23 | 29 | 30 | 29 | 32 | 31 | 31 | 27 |
Swell 1 Height (m) Direction Period (s) | SE 6 | SW 8 | E 17 | E 18 | E 17 | ENE 16 | SW 9 | ENE 13 | ENE 12 | SW 9 | NE 13 | NE 13 | NNE 13 | S 9 | ENE 12 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SW 10 | SW 10 |
88 | 702 | 855 | 2703 | 2980 | 2545 | 502 | 722 | 184 | 408 | 230 | 172 | 113 | 380 | 14 | 1199 | 1440 | 1124 | 1170 | 899 | 710 | |
Swell 2 Height (m) Direction Period (s) | ESE 14 | SE 6 | E 12 | SSW 8 | SW 8 | SW 9 | ENE 14 | SE 11 | SSE 7 | NE 13 | ENE 13 | ENE 13 | ENE 13 | NNE 11 | N 8 | NW 6 | WNW 6 | ENE 13 | ENE 10 | ENE 9 | ENE 12 |
69 | 35 | 73 | 616 | 509 | 505 | 1267 | 5 | 5 | 235 | 35 | 34 | 17 | 11 | 1 | 19 | 13 | 59 | 34 | 26 | 50 | |
Swell 3 Height (m) Direction Period (s) | E 19 | E 13 | ENE 10 | ENE 10 | ENE 11 | — | SE 9 | — | NE 18 | ENE 14 | SE 10 | SE 10 | SE 10 | ENE 13 | E 16 | ENE 12 | ENE 12 | E 11 | ENE 13 | ENE 13 | SE 8 |
7 | 92 | 9 | 10 | 12 | — | 3 | — | 12 | 40 | 4 | 4 | 4 | 16 | 5 | 28 | 28 | 2 | 34 | 33 | 10 | |
Wind waves Height (m) Direction Period (s) | SW 8 | — | SW 8 | — | — | — | SW 8 | SW 8 | SW 9 | WNW 4 | SW 8 | SW 8 | SW 8 | WSW 8 | SSW 9 | — | — | — | — | NE 4 | ENE 4 |
836 | — | 649 | — | — | — | 588 | 625 | 493 | 31 | 734 | 1001 | 1282 | 713 | 1178 | — | — | — | — | 7 | 62 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 442 | 148 | 329 | 14 | 0 | 2 | 14 | 14 | 148 | 42 | 148 | 148 | 390 | 639 | 316 | 535 | 535 | 329 | 1160 | 859 | 535 |
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.











