Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 20 Sep 2026:
- Best quality surf: Sunday 27 Sep, 8AM (local time) - 11ft (3.5m), 15s period, E swell with offshore winds.
- Most powerful swell: Sunday 27 Sep, 2PM (local time) - 13ft (4.0m), 16s period, E swell with 6,920 kJ wave energy.
- Next surfable swell (1★+): Friday 25 Sep, 8PM (local time) - 1.5ft (0.4m), 15s period with ESE 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 (Sep 25) at 8PM. The primary swell is predicted to be 0.4m and 15s period with a secondary swell of 0.4m and 7s. 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 4.0m 16s and forecast to arrive on Sunday (Sep 27) 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 2.0m 14s period and expected on Monday (Sep 21) at 8AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Fri 25th Sep) | 1.5ft (0.4m) 15s |
| Best Surf | 8AM (Sun 27th Sep) | 11ft (3.5m) 15s |
| Most Powerful | 2PM (Sun 27th Sep) | 13ft (4.0m) 16s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
Short Range ForecastSome drizzle, heaviest during Sun night. Warm (max 28°C on Sun afternoon, min 25°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 28°C on Wed afternoon, min 26°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sun 20 | Monday 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | Friday 25 | Saturday 26 | ||||||||||||||
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) | SE 8 | SE 8 | S 8 | SSW 8 | SSW 7 | SSW 6 | SSW 6 | SE 10 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | SSW 8 | SW 7 | E 14 | ESE 14 | ESE 14 | E 15 |
Wave Graph  | ||||||||||||||||||||
 kJ | 3 | 2 | 5 | 6 | 5 | 4 | 4 | 4 | 8 | 8 | 8 | 8 | 8 | 8 | 6 | 14 | 423 | 1060 | 1526 | 3770 |
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-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | off |
High Tide | 2:05AM0.93m | 3:21AM0.98m | 5:52PM0.59m | 4:14AM1.03m | 5:51PM0.63m | 4:58AM1.07m | 6:02PM0.70m | 5:38AM1.08m | 6:19PM0.77m | 6:17AM1.07m | 6:40PM0.87m | |||||||||
Low Tide | 10:59AM0.25m | 11:23AM0.22m | 9:14PM0.53m | 11:44AM0.20m | 10:17PM0.45m | 12:05PM0.19m | 11:05PM0.36m | 12:25PM0.19m | 11:50PM0.28m | 12:45PM0.21m | 00:35AM0.21m | |||||||||
 |  | | |  |  | |  | | | | | | | | | | | | | |
 | — | — | 5:45 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — | 5:46 | — | — |
 | 5:54 | — | — | 5:53 | — | — | 5:52 | — | — | 5:52 | — | — | 5:51 | — | — | 5:50 | — | — | 5:49 | — |
mm | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 27 | 27 | 28 | 26 | 27 | 28 | 26 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 33 | 29 | 28 | 30 | 26 | 26 | 27 | 25 | 28 | 28 | 27 | 28 | 28 | 28 | 30 | 31 | 30 | 32 | 33 | 30 |
Swell 1 Height (m) Direction Period (s) | ENE 15 | ENE 14 | ENE 13 | ENE 14 | ENE 13 | ENE 12 | SSW 6 | ENE 11 | ESE 9 | ENE 12 | ENE 11 | ESE 9 | ESE 9 | ESE 9 | ENE 10 | SW 7 | E 14 | ESE 14 | ESE 14 | E 15 |
| kJ | 1028 | 1095 | 1074 | 1280 | 497 | 218 | 4 | 78 | 8 | 14 | 13 | 8 | 8 | 8 | 19 | 14 | 423 | 1060 | 1526 | 3770 |
Swell 2 Height (m) Direction Period (s) | SE 8 | SE 8 | S 8 | SSW 8 | SSW 7 | SSW 6 | SE 10 | SE 10 | E 10 | ESE 9 | ESE 9 | — | S 7 | SW 9 | SSW 7 | ENE 9 | SSW 7 | E 12 | NE 10 | — |
| kJ | 3 | 2 | 5 | 6 | 5 | 4 | 4 | 4 | 2 | 8 | 8 | — | 1 | 3 | 4 | 9 | 4 | 3 | 46 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | SE 10 | SE 10 | S 7 | SW 6 | SW 6 | S 6 | S 6 | — | S 8 | S 7 | SSW 8 | ESE 8 | ENE 9 | E 12 | — | — |
| kJ | — | — | — | — | 4 | 4 | 1 | 1 | 1 | 1 | 1 | — | 1 | 1 | 6 | 7 | 8 | 3 | — | — |
Wind waves Height (m) Direction Period (s) | NE 6 | NE 6 | NE 4 | — | NE 5 | NE 5 | NE 11 | ENE 5 | ENE 5 | ENE 5 | NE 5 | ENE 5 | ENE 5 | ENE 5 | ENE 4 | ENE 4 | NE 4 | ENE 9 | NE 10 | — |
| kJ | 64 | 72 | 25 | — | 66 | 76 | 493 | 69 | 59 | 67 | 98 | 83 | 80 | 69 | 24 | 13 | 20 | 49 | 76 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 2 | 348 | 694 | 676 | 348 | 694 | 449 | 329 | 694 | 693 | 316 | 694 | 676 | 316 | 843 | 676 | 0 | 0 | 0 | 0 |
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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