Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 20 Oct 2026:
- Best quality surf: Wednesday 21 Oct, 8PM (local time) - 13ft (4.0m), 18s period, ESE swell with cross-offshore winds.
- Most powerful swell: Thursday 22 Oct, 11AM (local time) - 21ft (6.5m), 19s period, E swell with 30,039 kJ wave energy.
- Next surfable swell (1★+): Tuesday 20 Oct, 5PM (local time) - 3.5ft (1.0m), 16s 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 Tuesday (Oct 20) at 5PM. The primary swell is predicted to be 1.0m and 16s period with a secondary swell of 0.3m and 20s. Another secondary swell of 1.3m and 9s is also forecast. 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 6.5m 19s and forecast to arrive on Thursday (Oct 22) 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 6.5m 17s period and expected on Thursday (Oct 22) at 11PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Tue 20th Oct) | 3.5ft (1.0m) 16s |
| Best Surf | 8PM (Wed 21st Oct) | 13ft (4.0m) 18s |
| Most Powerful | 11AM (Thu 22nd Oct) | 21ft (6.5m) 19s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
Short Range ForecastMostly dry. Warm (max 29°C on Tue morning, min 26°C on Wed night). Winds decreasing (strong winds from the NE on Wed afternoon, light winds from the WNW by Thu afternoon). | Days 4-6 Weather SummaryHeavy rain (total 105mm), heaviest during Sat morning. Warm (max 28°C on Fri afternoon, min 25°C on Sat morning). Winds decreasing (gales from the W on Fri night, light winds from the E by Sat night). | ||||||||||||||||||||
Tuesday 20 | Wednesday 21 | Thursday 22 | Friday 23 | Saturday 24 | Sunday 25 | Monday 26 | |||||||||||||||
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) | E 17 | ESE 16 | E 16 | ESE 16 | ESE 18 | E 18 | E 19 | E 17 | ENE 16 | ENE 16 | ENE 16 | ESE 12 | WSW 9 | SW 8 | SSW 7 | SW 7 | ESE 9 | E 8 | E 9 | E 9 | E 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 154 | 520 | 2675 | 3444 | 7599 | 17228 | 30039 | 22820 | 0 | 0 | 0 | 79 | 3208 | 1717 | 362 | 163 | 328 | 283 | 159 | 207 | 207 |
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-on | cross-on | on | cross-on | cross | cross | cross-off | cross-off | cross-off |
High Tide | 5:33PM0.60m | 2:30AM0.91m | 4:50PM0.65m | 3:33AM0.93m | 4:55PM0.73m | 4:25AM0.94m | 5:10PM0.82m | 5:12AM0.93m | 5:32PM0.93m | 5:59AM0.90m | 5:57PM1.05m | 6:45AM0.84m | 6:27PM1.15m | ||||||||
Low Tide | 9:51AM0.28m | 6:57PM0.59m | 10:17AM0.26m | 9:06PM0.53m | 10:40AM0.25m | 10:09PM0.43m | 11:02AM0.25m | 11:00PM0.32m | 11:24AM0.27m | 11:47PM0.20m | 11:46AM0.30m | 00:34AM0.10m | 12:08PM0.33m | 1:22AM0.03m | |||||||
 | |  | |  |  | | | |  | |  |  |  |  | | | | | | | |
 | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — |
 | — | 5:28 | — | — | 5:27 | — | — | 5:25 | — | — | 5:25 | — | — | 5:24 | — | — | 5:23 | — | — | 5:23 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 20 | 40 | 35 | 8 | 2 | — | — | — | — | — |
Temp °C | 29 | 29 | 27 | 29 | 28 | 27 | 27 | 27 | 27 | 26 | 28 | 28 | 25 | 25 | 27 | 28 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 30 | 31 | 29 | 29 | 28 | 24 | 29 | 30 | 30 | 24 | 27 | 24 | 18 | 22 | 29 | 29 | 28 | 28 | 29 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | E 17 | ESE 16 | E 16 | ESE 16 | ESE 18 | E 18 | E 19 | E 17 | ENE 16 | ENE 16 | ENE 16 | NE 13 | ESE 11 | SE 10 | W 8 | SW 7 | WSW 6 | W 6 | E 9 | E 9 | E 9 |
| kJ | 154 | 520 | 2675 | 3444 | 7599 | 17228 | 30039 | 22820 | 18094 | 16785 | 14388 | 2719 | 167 | 139 | 142 | 163 | 75 | 19 | 159 | 207 | 207 |
Swell 2 Height (m) Direction Period (s) | ESE 15 | ESE 20 | — | — | — | — | — | NE 12 | NW 10 | NW 12 | WNW 8 | ESE 12 | NE 10 | E 11 | SE 9 | E 10 | NE 8 | SSW 5 | SE 7 | SE 7 | SE 7 |
| kJ | 71 | 75 | — | — | — | — | — | 3707 | 185 | 52 | 228 | 79 | 25 | 86 | 188 | 149 | 3 | 2 | 27 | 24 | 12 |
Swell 3 Height (m) Direction Period (s) | ESE 15 | — | — | — | — | — | — | — | — | — | — | — | ENE 10 | NE 9 | E 10 | NNE 9 | NE 8 | WSW 6 | WSW 6 | WSW 5 | WSW 5 |
| kJ | 71 | — | — | — | — | — | — | — | — | — | — | — | 19 | 14 | 100 | 8 | 11 | 29 | 12 | 5 | 2 |
Wind waves Height (m) Direction Period (s) | ENE 9 | E 9 | — | ENE 6 | ENE 8 | NE 10 | NE 11 | NE 12 | — | NW 10 | NW 10 | WNW 11 | WSW 9 | SW 8 | SSW 7 | SE 8 | ESE 9 | E 8 | ENE 4 | N 3 | — |
| kJ | 270 | 281 | — | 191 | 1112 | 2081 | 2316 | 10407 | — | 396 | 1962 | 8622 | 3208 | 1717 | 362 | 136 | 328 | 283 | 10 | 2 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 694 | 0 | 0 | 535 | 639 | 535 | 535 | 535 | 442 | 667 | 535 | 535 | 449 | 442 | 148 | 148 | 148 | 148 | 363 | 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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