Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 24 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 8PM (local time) - 6.5ft (2.0m), 8s period, SSW swell with cross-offshore winds.
- Most powerful swell: Tuesday 25 Aug, 5PM (local time) - 8ft (2.4m), 17s period, E swell with 3,355 kJ wave energy.
- Next surfable swell (1★+): Tuesday 25 Aug, 8PM (local time) - 6.5ft (2.0m), 8s period with SSW 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 8PM. The primary swell is predicted to be 2.0m and 8s 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 2.4m 17s and forecast to arrive on Tuesday (Aug 25) at 5PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 17s period and expected on Tuesday (Aug 25) at 8PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Tue 25th Aug) | 6.5ft (2.0m) 8s |
| Best Surf | 8PM (Tue 25th Aug) | 6.5ft (2.0m) 8s |
| Most Powerful | 5PM (Tue 25th Aug) | 8ft (2.4m) 17s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, Rusty here. Let's chew the fat on Nanwan Beach (South Bay) over the next couple of weeks.
First thing, the water temp is a balmy 84°F, right where it should be for this time of year. No funny business there.
Now for the waves… it's a rough patch. The one real highlight is on Tuesday afternoon, August 25th. We’ve got a big groundswell from the East, pushing in at about 8ft with a 17-second period. That’s serious energy (combined energy 3926) and the wind is blowing cross-offshore, keeping it smooth. But here’s the thing – with that long a period, the waves can straighten out on a beach break like this. It’s better for a reef or point, so it’s a challenge for the experts. For everyone else, this is the best window we get.
Before that, Monday the 24th is a mess – cross-shore wind, 8ft swell, just no quality. And after that Tuesday session, the wheels fall off. From Wednesday the 26th all the way through to the 31st, it’s a solid 6-day stretch of poor conditions. Strong winds, onshore or cross-offshore, and even though there's size (7ft to 10ft), the quality is terrible. Not worth the paddle.
We see a little flicker on Wednesday, September 2nd, with a 5ft swell and a 10-second period, but the wind is cross-onshore and messy (combined energy 1532). Thursday the 3rd and Friday the 4th have size again – up to 10ft – but it's onshore and rough. That’s expert-only territory; beginners, don’t even think about it.
By the weekend of September 5th and 6th, the swell drops to tiny 3-3ft with weak energy. The wind goes glassy or cross-offshore on Sunday and Monday the 7th and 8th, which is perfect for the surface, but there's no power behind it. Tuesday the 8th afternoon has a nice offshore breeze and clean conditions, but again, it’s just little knee-high slop. Some of those gusty, blown-out days earlier on might look fun for a kite surfer, but for a surfer with a paddle, it's not happening.
So the call is simple: Tuesday afternoon, August 25th is your one and only standout – big, clean, and challenging. After that, it's a long, lean run with only small clean waves at the very end. Tough stretch for Nanwan.
- Rusty
Short Range ForecastHeavy rain (total 73mm), heaviest during Mon afternoon. Warm (max 28°C on Tue morning, min 26°C on Mon afternoon). Winds increasing (light winds from the W on Tue night, strong winds from the WNW by Thu morning). | Days 5-7 Weather SummaryHeavy rain (total 57mm), heaviest during Fri night. Warm (max 28°C on Thu afternoon, min 26°C on Fri afternoon). Winds decreasing (near gales from the W on Fri morning, light winds from the SSE by Sat morning). | |||||||||||||||||||
Mon 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | ||||||||||||||
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 | E 17 | E 18 | E 17 | SSW 9 | SW 9 | SW 9 | SW 9 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 9 | SSW 9 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SW 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 694 | 855 | 2703 | 3355 | 637 | 616 | 568 | 490 | 681 | 786 | 767 | 929 | 1078 | 1107 | 766 | 1058 | 889 | 945 | 756 | 612 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross | cross-off | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | on | on | cross | cross | 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 | 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 | — | — | 5:39 | — | — | 5:39 | — | — |
 | 6:21 | — | — | 6:20 | — | — | 6:19 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:15 | — |
mm | 18 | 23 | 10 | 6 | 6 | 3 | 2 | 3 | 2 | 2 | 1 | 1 | 8 | 22 | 3 | 5 | 11 | 4 | 1 | 11 |
Temp °C | 27 | 27 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 28 | 28 | 28 | 28 | 29 | 28 |
Feels °C | 28 | 30 | 30 | 29 | 32 | 29 | 29 | 29 | 27 | 27 | 26 | 24 | 23 | 24 | 32 | 31 | 32 | 28 | 30 | 29 |
Swell 1 Height (m) Direction Period (s) | SW 8 | E 17 | E 18 | E 17 | ENE 16 | ENE 14 | ENE 14 | ENE 12 | NE 13 | NE 13 | NNE 13 | NNE 13 | NE 12 | SW 9 | SSW 9 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SW 10 |
| kJ | 694 | 855 | 2703 | 3355 | 2801 | 1374 | 754 | 190 | 239 | 277 | 206 | 225 | 68 | 481 | 766 | 1058 | 889 | 945 | 756 | 612 |
Swell 2 Height (m) Direction Period (s) | SE 6 | E 12 | ENE 10 | SW 8 | SSW 9 | SE 10 | SE 11 | ESE 11 | ENE 14 | ENE 13 | ENE 13 | ENE 13 | ENE 13 | S 8 | ENE 12 | SE 9 | ENE 13 | ENE 13 | ENE 13 | ENE 12 |
| kJ | 34 | 73 | 10 | 571 | 637 | 4 | 5 | 11 | 40 | 35 | 34 | 33 | 16 | 324 | 14 | 12 | 59 | 98 | 33 | 29 |
Swell 3 Height (m) Direction Period (s) | E 13 | ENE 10 | — | ENE 11 | — | — | SE 11 | SSE 7 | E 11 | ESE 10 | SE 10 | SE 10 | SE 10 | ENE 12 | ENE 15 | ENE 12 | — | SE 9 | SE 8 | ENE 12 |
| kJ | 92 | 9 | — | 12 | — | — | 5 | 5 | 9 | 10 | 4 | 4 | 4 | 14 | 21 | 28 | — | 12 | 11 | 57 |
Wind waves Height (m) Direction Period (s) | — | SW 8 | SW 8 | — | — | SW 9 | SW 9 | SW 9 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 9 | — | — | — | NE 4 | ENE 4 | ENE 4 |
| kJ | — | 649 | 860 | — | — | 616 | 568 | 490 | 681 | 786 | 767 | 929 | 1078 | 1107 | — | — | — | 45 | 39 | 32 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 148 | 329 | 42 | 14 | 2 | 42 | 42 | 148 | 538 | 148 | 148 | 148 | 329 | 639 | 14 | 378 | 859 | 79 | 859 | 693 |
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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