Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 21 Aug 2026:
- Best quality surf: Thursday 27 Aug, 5PM (local time) - 6ft (1.9m), 10s period, SW swell with cross-offshore winds.
- Most powerful swell: Tuesday 25 Aug, 11AM (local time) - 7ft (2.1m), 18s period, E swell with 2,672 kJ wave energy.
- Next surfable swell (1★+): Wednesday 26 Aug, 5AM (local time) - 5.5ft (1.7m), 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 Wednesday (Aug 26) at 5AM. The primary swell is predicted to be 1.7m 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 2.1m 18s and forecast to arrive on Tuesday (Aug 25) at 11AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.2m 16s period and expected on Tuesday (Aug 25) at 8PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Wed 26th Aug) | 5.5ft (1.7m) 9s |
| Best Surf | 5PM (Thu 27th Aug) | 6ft (1.9m) 10s |
| Most Powerful | 11AM (Tue 25th Aug) | 7ft (2.1m) 18s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, Rusty here. Let's have a look at what's on offer for the next couple of weeks.
Honestly, folks, it's a tough stretch ahead. We've got a real battle on our hands with wind and weather. For the first week at least, it's all about dodging stormy conditions and strong, messy cross-shore winds. The water temp is sitting at a warm 84°, which is pretty much spot-on for this time of year, so that's one good thing.
The first real chance to even think about it is on the morning of Saturday the 22nd at Nanwan Beach (South Bay). We’ve got a 8 ft SW swell rolling in with a period of 10 seconds, so moderate energy (1209). The wind is a cross-offshore breeze, which should clean things up a bit. It’s not going to be perfect, but it's likely the best window in a sea of poor forecasts. The Saturday afternoon session is much the same story with 8 ft and a slightly shorter 9 second period (1147). The crowds are often here, so expect company.
The wind turns ugly again from Sunday the 23rd right through to Friday the 28th. It’s a long stretch of messy, cross-shore junk with solid but poor-quality swell. The wave energy stays moderate for most of that time, but with constant wind and risk of thunderstorms, it's a bit of a write-off for a decent paddle. If you're into kite surfing, the strong cross-shore winds and hefty 10 ft to 12 ft SW swell on the 24th might just get you stoked.
We get a tiny glimmer a week out on Tuesday the 25th. A very long-period groundswell from the east sneaks in – 18 seconds! The combined energy is strong (3271) but the swell jumps to 7 ft. The problem? It's still a fresh cross-shore breeze making a lumpy mess of it. A long-period swell like that really wants a point break to wrap around, not a beach and reef set-up getting chopped up.
After that, it's more of the same grind. There’s a small window on Wednesday the 2nd of September morning with 6 ft of SW swell and a cross-off wind, but it's just marginal. The end of the forecast period has something to keep in the back of your mind. The morning of Friday the 4th of September looks promising – light winds, almost glassy, with a clean 5 ft SW swell. The wave energy is moderate (568). It’s a long way out so treat it with caution, but it’s the first time in ages conditions genuinely look good for a proper, clean session.
For now, don't get your hopes up too high. The best bet looks like that Saturday the 22nd for a rough but rideable wave, or keep your fingers crossed that the glassy conditions on the 4th of September deliver.
- Rusty
Short Range ForecastHeavy rain (total 159mm), heaviest during Fri night. Warm (max 27°C on Fri morning, min 26°C on Fri night). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 194mm), heaviest during Tue afternoon. Warm (max 28°C on Tue morning, min 24°C on Tue afternoon). Winds decreasing (strong winds from the WSW on Mon afternoon, calm by Wed morning). | ||||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | |||||||||||||||
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 10 | SW 10 | SW 10 | SW 10 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | E 18 | E 18 | E 16 | SW 9 | SW 9 | SW 10 | SW 10 | SSW 9 | SW 10 | SSW 10 |
Wave Graph | |||||||||||||||||||||
1904 | 2129 | 1631 | 1195 | 1168 | 1126 | 1094 | 1175 | 1065 | 834 | 1010 | 1351 | 2672 | 2573 | 492 | 492 | 566 | 398 | 591 | 681 | 522 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross-off | cross | cross | cross | cross-off | cross | cross | cross | cross-off | cross | cross-on | on | glassy | cross | cross | cross-off | cross-off | glassy |
High Tide | 1:28AM0.95m | 2:47AM0.98m | 3:51AM1.03m | 6:41PM0.54m | 4:42AM1.09m | 6:38PM0.56m | 5:24AM1.14m | 6:49PM0.59m | 6:02AM1.17m | 7:06PM0.64m | |||||||||||
Low Tide | 9:52AM0.36m | 11:01AM0.29m | 11:37AM0.24m | 12:05PM0.19m | 9:07PM0.52m | 12:31PM0.16m | 10:17PM0.46m | 12:55PM0.14m | 11:07PM0.40m | 1:18PM0.14m | 11:51PM0.35m | ||||||||||
5:35 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | |
— | 6:22 | — | — | 6:22 | — | — | 6:21 | — | — | 6:21 | — | — | 6:20 | — | — | 6:19 | — | — | 6:17 | — | |
mm | 14 | 21 | 42 | 11 | 6 | 13 | 14 | 20 | 18 | 22 | 18 | 36 | 14 | 52 | 34 | 5 | 4 | 9 | 9 | 4 | 5 |
Temp °C | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 28 | 27 | 27 | 25 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 26 | 26 | 27 | 29 | 28 | 29 | 28 | 27 | 29 | 27 | 25 | 26 | 30 | 30 | 30 | 30 | 32 | 31 | 32 | 31 | 34 |
Swell 1 Height (m) Direction Period (s) | ENE 8 | ENE 8 | NE 8 | ESE 10 | SW 9 | ESE 10 | ESE 10 | ESE 10 | ESE 9 | ESE 8 | E 19 | SW 9 | SW 9 | E 16 | ENE 16 | SW 9 | SW 10 | SW 10 | SSW 9 | SW 10 | SSW 10 |
13 | 7 | 3 | 10 | 1168 | 20 | 19 | 19 | 17 | 28 | 263 | 959 | 734 | 2573 | 2134 | 492 | 566 | 398 | 591 | 681 | 522 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | NE 8 | ESE 10 | NE 8 | NE 9 | E 14 | E 14 | E 14 | ESE 14 | E 18 | E 18 | SW 9 | SW 9 | ENE 14 | ENE 14 | NE 13 | NE 12 | NE 12 | NNE 12 |
— | — | — | 3 | 10 | 3 | 3 | 16 | 15 | 66 | 61 | 1351 | 2672 | 683 | 492 | 1171 | 733 | 388 | 207 | 152 | 54 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | NE 8 | — | — | — | NE 6 | NE 6 | SE 8 | SE 8 | NE 7 | NE 8 | ENE 8 | ENE 8 | ENE 19 | E 15 | ENE 14 | ENE 13 | ENE 13 |
— | — | — | — | 3 | — | — | — | 2 | 2 | 17 | 11 | 32 | 159 | 72 | 50 | 36 | 17 | 40 | 35 | 34 | |
Wind waves Height (m) Direction Period (s) | SW 10 | SW 10 | SW 10 | SW 10 | — | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | — | — | — | — | — | W 4 | WSW 4 | W 5 | WNW 5 | W 5 |
1904 | 2129 | 1631 | 1195 | — | 1126 | 1094 | 1175 | 1065 | 834 | 1010 | — | — | — | — | — | 22 | 24 | 44 | 49 | 45 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 378 | 348 | 348 | 375 | 42 | 639 | 42 | 148 | 148 | 42 | 148 | 148 | 535 | 442 | 14 | 14 | 2 | 0 | 14 | 14 | 148 |
Best forecast wave conditions in South Taiwan | |||||||||||||||||||||
Best forecast wave conditions in Taiwan | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.











