Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 13 Aug 2026:
- Best quality surf: Monday 17 Aug, 11AM (local time) - 7.5ft (2.3m), 9s period, SW swell with cross-offshore winds.
- Most powerful swell: Monday 17 Aug, 11AM (local time) - 7.5ft (2.3m), 9s period, SW swell with 853 kJ wave energy.
- Next surfable swell (1★+): Friday 14 Aug, 11PM (local time) - 5ft (1.6m), 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 Friday (Aug 14) at 11PM. The primary swell is predicted to be 1.6m and 8s period with a secondary swell of 1.3m and 9s. 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 9s and forecast to arrive on Monday (Aug 17) at 11AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.3m 7s period and expected on Thursday (Aug 20) at 2PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Fri 14th Aug) | 5ft (1.6m) 8s |
| Best Surf | 11AM (Mon 17th Aug) | 7.5ft (2.3m) 9s |
| Most Powerful | 11AM (Mon 17th Aug) | 7.5ft (2.3m) 9s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
Short Range ForecastHeavy rain (total 85mm), heaviest during Sat morning. Warm (max 29°C on Fri morning, min 26°C on Sat afternoon). Mainly fresh winds. | Days 4-6 Weather SummaryModerate rain (total 17mm), heaviest on Mon afternoon. Warm (max 30°C on Mon afternoon, min 27°C on Wed night). Winds increasing (calm on Mon afternoon, strong winds from the ENE by Wed afternoon). | ||||||||||||||||||||
Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | |||||||||||||||
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) | SSW 8 | SSW 8 | SW 8 | SW 8 | SW 8 | SW 9 | SSW 9 | SSW 9 | SSW 9 | SW 9 | SW 8 | SW 8 | SW 9 | SW 9 | SW 9 | SW 9 | SSW 10 | SW 10 | SW 10 | SSW 10 | SSW 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 356 | 515 | 330 | 719 | 671 | 643 | 595 | 595 | 637 | 853 | 567 | 372 | 314 | 365 | 260 | 206 | 314 | 281 | 235 | 327 | 480 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | cross | cross | cross | cross-off | cross | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | 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 | — | — | 5:33 | — | — | 5:35 | — | — | 5:35 | — | — | 5:35 | — | — | 5:35 | — | — |
 | — | 6:28 | — | — | 6:28 | — | — | 6:27 | — | — | 6:25 | — | — | 6:24 | — | — | 6:24 | — | — | 6:23 | — |
mm | 8 | 9 | 8 | 15 | 14 | 17 | 6 | — | 8 | 3 | 3 | 1 | — | 1 | 1 | — | 1 | 7 | 14 | 7 | 13 |
Temp °C | 29 | 29 | 29 | 28 | 26 | 28 | 28 | 28 | 29 | 29 | 30 | 28 | 30 | 30 | 29 | 29 | 29 | 28 | 28 | 29 | 28 |
Feels °C | 31 | 31 | 33 | 30 | 26 | 29 | 31 | 31 | 33 | 32 | 34 | 31 | 31 | 30 | 28 | 28 | 26 | 27 | 32 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | ENE 10 | ENE 10 | S 9 | ENE 10 | SE 8 | SW 9 | SSW 9 | SSW 9 | SSW 9 | SW 9 | SW 8 | SW 8 | SW 9 | SW 9 | SW 9 | SW 9 | SSW 10 | SW 10 | SW 10 | SSW 10 | SSW 9 |
| kJ | 40 | 39 | 311 | 19 | 9 | 643 | 595 | 595 | 637 | 673 | 567 | 372 | 314 | 365 | 260 | 206 | 314 | 281 | 235 | 327 | 480 |
Swell 2 Height (m) Direction Period (s) | SE 9 | 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 | SE 10 | SE 8 | SE 8 | SE 8 | SE 6 | SE 8 | NE 6 |
| kJ | 19 | 18 | 19 | 11 | 10 | 23 | 31 | 30 | 42 | 40 | 39 | 39 | 42 | 10 | 4 | 3 | 3 | 3 | 19 | 69 | 39 |
Swell 3 Height (m) Direction Period (s) | NE 8 | SE 12 | SE 8 | SE 11 | ESE 11 | ESE 10 | ESE 10 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | ESE 10 | SE 8 | SE 8 | — | — | — | SE 9 | SE 10 | SE 10 |
| kJ | 3 | 5 | 9 | 5 | 11 | 10 | 11 | 12 | 12 | 11 | 11 | 11 | 11 | 2 | 3 | — | — | — | 14 | 44 | 74 |
Wind waves Height (m) Direction Period (s) | SSW 8 | SSW 8 | SW 8 | SW 8 | SW 8 | — | — | — | — | SW 9 | — | NNE 3 | NE 4 | NE 5 | NE 6 | ENE 7 | ENE 6 | ENE 8 | ENE 6 | NE 7 | — |
| kJ | 356 | 515 | 330 | 719 | 671 | — | — | — | — | 853 | — | 2 | 11 | 99 | 184 | 216 | 275 | 494 | 271 | 363 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 378 | 316 | 14 | 639 | 348 | 348 | 0 | 2 | 0 | 0 | 535 | 0 | 860 | 860 | 535 | 535 | 845 | 148 | 643 | 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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