Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 14 Aug 2026:
- Best quality surf: Sunday 16 Aug, 8AM (local time) - 7ft (2.2m), 8s period, SW swell with cross-offshore winds.
- Most powerful swell: Friday 21 Aug, 5AM (local time) - 11ft (3.5m), 9s period, SSW swell with 2,008 kJ wave energy.
- Next surfable swell (1★+): Sunday 16 Aug, 8AM (local time) - 7ft (2.2m), 8s 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 Sunday (Aug 16) at 8AM. The primary swell is predicted to be 2.2m 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 3.5m 9s and forecast to arrive on Friday (Aug 21) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 6s period and expected on Wednesday (Aug 19) at 2PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Sun 16th Aug) | 7ft (2.2m) 8s |
| Best Surf | 8AM (Sun 16th Aug) | 7ft (2.2m) 8s |
| Most Powerful | 5AM (Fri 21st Aug) | 11ft (3.5m) 9s |
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 cooking for Nanwan Beach.
Alright, so the outlook for the next couple of weeks is a bit of a mixed bag, with a lot of stormy weather and tricky winds to work through. The water temperature is sitting right around 84°, which is pretty much bang on average for this time of year, so no surprises there.
The first real standout for a paddle comes on Monday, August 17th. The early morning session is looking choice. We’ve got a clean 7ft swell rolling in from the southwest, with a 9-second period. The energy is moderate (684), and the wind is completely glassy, which is a major positive. It’s going to be smooth and clean. Later that same afternoon, the wind stays light, with a 7ft SW swell, still glassy, but the energy dips a little (578). That Monday morning is the best on offer.
Before that, things are pretty average. Friday afternoon through Sunday is all risk of thunderstorms and cross-off or cross-shore winds. The surf is there, around 7ft to 7ft from the SW/SSW, with moderate energy (500-600), but the wind and the stormy look make it marginal. The Sunday morning session is a write-off with poor conditions.
After Monday, the window closes fast. From Tuesday, the 18th, through the end of the month, the wind goes onshore or cross-shore, and the swell quality drops. The energy stays moderate but the wind ruins it. By the 21st, the swell actually builds to 10ft from the SSW, with strong energy (1731), but the cross-onshore wind makes it messy and choppy. That’s not a paddle wave; that’s a kite surfing setup if anything.
The last week of August and into the 29th has some small, clean-looking swells (3ft to 6ft), but the wind is either too strong or cross-shore, leaving the surf poor or just ordinary. The 24th offers a little glassy 4ft wave, but it’s very ordinary.
So, to wrap it up: your best bet is Monday morning, August 17th, at Nanwan Beach (South Bay). Get up early for the glassy, 7ft SW swell. It’s the only real standout. After that, it’s a long slog of poor conditions. Forecasts can change, but right now, that’s the call.
Rusty.
Short Range ForecastHeavy rain (total 48mm), heaviest during Sat night. Warm (max 29°C on Fri afternoon, min 27°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 32mm), heaviest during Thu morning. Warm (max 30°C on Tue morning, min 27°C on Wed night). Winds increasing (calm on Mon afternoon, fresh winds from the ENE by Wed morning). | |||||||||||||||||||
Fri 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | ||||||||||||||
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 | SSW 8 | SSW 8 | SW 8 | SW 8 | SSW 8 | SSW 9 | SW 9 | SW 9 | SW 8 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 10 | SSW 9 | SSW 9 | S 9 | SSW 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 543 | 525 | 525 | 650 | 459 | 581 | 516 | 657 | 673 | 567 | 354 | 307 | 300 | 266 | 202 | 269 | 495 | 680 | 1138 | 1835 |
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 | cross | cross-on | glassy | glassy | cross-off | cross-off | cross-off | cross-off | cross | cross | cross-on | on | on | cross-on |
High Tide | 8:26PM0.69m | 8:15AM1.17m | 8:55PM0.76m | 8:55AM1.03m | 9:26PM0.83m | 9:33AM0.87m | 9:58PM0.88m | 10:10AM0.71m | 10:34PM0.92m | 10:51AM0.58m | 11:17PM0.93m | 12:03PM0.47m | 00:13AM0.94m | |||||||
Low Tide | 2:39PM0.10m | 1:33AM0.28m | 3:05PM0.18m | 2:26AM0.28m | 3:25PM0.26m | 3:20AM0.31m | 3:40PM0.33m | 4:21AM0.35m | 3:48PM0.38m | 5:35AM0.39m | 3:49PM0.42m | 7:25AM0.40m | 3:28PM0.44m | |||||||
 |  | | | | |  | | | | | | | | | | | |  | | |
 | — | — | 5:33 | — | — | 5:33 | — | — | 5:35 | — | — | 5:35 | — | — | 5:35 | — | — | 5:35 | — | — |
 | 6:28 | — | — | 6:28 | — | — | 6:27 | — | — | 6:25 | — | — | 6:24 | — | — | 6:24 | — | — | 6:23 | — |
mm | 8 | 7 | 4 | 5 | 14 | 2 | — | 7 | 1 | 2 | 2 | 2 | 1 | 4 | 2 | 3 | 7 | 9 | 8 | 17 |
Temp °C | 29 | 28 | 29 | 29 | 28 | 28 | 29 | 28 | 29 | 29 | 29 | 30 | 30 | 29 | 30 | 30 | 28 | 28 | 28 | 28 |
Feels °C | 31 | 30 | 31 | 30 | 30 | 31 | 32 | 33 | 35 | 33 | 32 | 32 | 30 | 28 | 29 | 30 | 28 | 31 | 29 | 30 |
Swell 1 Height (m) Direction Period (s) | NE 10 | SE 8 | SSW 8 | SE 8 | S 9 | SSW 8 | SSW 9 | SW 9 | SW 9 | SW 8 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 10 | SSW 9 | SSW 9 | ENE 8 | ENE 8 |
| kJ | 25 | 15 | 525 | 15 | 318 | 581 | 516 | 657 | 673 | 567 | 354 | 307 | 300 | 266 | 202 | 269 | 495 | 680 | 49 | 37 |
Swell 2 Height (m) Direction Period (s) | SE 8 | ENE 10 | SE 8 | ENE 10 | ENE 11 | NE 11 | NE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ESE 10 | ESE 10 | SSE 8 | SSE 8 | ENE 9 | ENE 8 | — | — |
| kJ | 16 | 19 | 10 | 10 | 23 | 31 | 30 | 41 | 40 | 39 | 39 | 42 | 10 | 10 | 6 | 6 | 144 | 96 | — | — |
Swell 3 Height (m) Direction Period (s) | SE 12 | SE 11 | ENE 10 | ESE 11 | ESE 10 | ESE 10 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | ESE 10 | SE 8 | SE 8 | SE 10 | SE 10 | SE 8 | SE 9 | — | — |
| kJ | 5 | 5 | 19 | 11 | 10 | 11 | 12 | 12 | 11 | 11 | 11 | 11 | 2 | 2 | 4 | 4 | 18 | 20 | — | — |
Wind waves Height (m) Direction Period (s) | SW 8 | SSW 8 | — | SW 8 | SW 8 | — | — | — | — | — | NE 4 | NE 5 | NE 6 | NE 5 | NE 6 | ENE 6 | — | — | S 9 | SSW 9 |
| kJ | 543 | 525 | — | 650 | 459 | — | — | — | — | — | 5 | 38 | 154 | 129 | 195 | 260 | — | — | 1138 | 1835 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 838 | 14 | 14 | 14 | 42 | 14 | 2 | 14 | 0 | 0 | 42 | 859 | 859 | 535 | 639 | 859 | 14 | 148 | 148 | 316 |
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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