Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 17 Oct 2026:
- Best quality surf: Wednesday 21 Oct, 11PM (local time) - 13ft (4.0m), 18s period, E swell with cross-offshore winds.
- Most powerful swell: Thursday 22 Oct, 8AM (local time) - 15ft (4.5m), 18s period, E swell with 13,847 kJ wave energy.
- Next surfable swell (1★+): Tuesday 20 Oct, 2PM (local time) - 4ft (1.2m), 9s period with E 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 2PM. The primary swell is predicted to be 1.2m and 9s period with a secondary swell of 0.7m and 15s. Another secondary swell of 0.7m and 15s 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 4.5m 18s and forecast to arrive on Thursday (Oct 22) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 5.5m 17s period and expected on Thursday (Oct 22) at 5PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Tue 20th Oct) | 4ft (1.2m) 9s |
| Best Surf | 11PM (Wed 21st Oct) | 13ft (4.0m) 18s |
| Most Powerful | 8AM (Thu 22nd Oct) | 15ft (4.5m) 18s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
Short Range ForecastMostly dry. Warm (max 29°C on Sun afternoon, min 26°C on Sun night). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 28°C on Tue morning, min 24°C on Wed night). Winds increasing (light winds from the NNE on Tue afternoon, strong winds from the NE by Wed afternoon). | ||||||||||||||||||||
Saturday 17 | Sunday 18 | Monday 19 | Tuesday 20 | Wednesday 21 | Thursday 22 | Friday 23 | |||||||||||||||
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) | ENE 5 | E 5 | ENE 5 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ESE 10 | E 17 | E 9 | ESE 14 | E 15 | ESE 16 | ESE 17 | E 19 | E 18 | ENE 17 | ENE 17 | ENE 16 | ENE 16 | ENE 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 69 | 106 | 121 | 154 | 113 | 207 | 166 | 10 | 24 | 269 | 350 | 2055 | 3169 | 5206 | 11989 | 13023 | 0 | 0 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | 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 | cross-off | off |
High Tide | 10:11PM0.98m | 11:23PM0.93m | 1:04AM0.90m | 5:33PM0.60m | 2:30AM0.91m | 4:50PM0.65m | 3:33AM0.93m | 4:55PM0.73m | 4:25AM0.94m | 5:10PM0.82m | |||||||||||
Low Tide | 7:49AM0.32m | 9:11AM0.30m | 9:51AM0.28m | 6:57PM0.59m | 10:17AM0.26m | 9:06PM0.53m | 10:40AM0.25m | 10:09PM0.43m | 11:02AM0.25m | 11:00PM0.32m | |||||||||||
 | |  | | | | | | | | | | | |  |  |  | | | | | |
 | 5:52 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:56 | — | — |
 | — | 5:30 | — | — | 5:30 | — | — | 5:29 | — | — | 5:28 | — | — | 5:27 | — | — | 5:25 | — | — | 5:25 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 28 | 27 | 28 | 29 | 27 | 28 | 29 | 27 | 28 | 28 | 27 | 28 | 28 | 25 | 25 | 25 | 25 | 26 | 28 | 27 |
Feels °C | 28 | 27 | 26 | 28 | 29 | 27 | 27 | 30 | 28 | 29 | 31 | 29 | 27 | 25 | 20 | 23 | 22 | 24 | 26 | 28 | 26 |
Swell 1 Height (m) Direction Period (s) | NE 13 | E 13 | E 9 | E 12 | ENE 11 | SE 11 | SE 10 | ESE 10 | ESE 10 | E 15 | E 9 | E 15 | ESE 16 | ESE 17 | E 19 | E 18 | ENE 17 | ENE 17 | ENE 16 | ENE 16 | ENE 16 |
| kJ | 7 | 3 | 1 | 3 | 12 | 5 | 4 | 10 | 9 | 118 | 235 | 2055 | 3169 | 5206 | 11989 | 13023 | 16578 | 14014 | 11605 | 10872 | 12383 |
Swell 2 Height (m) Direction Period (s) | E 9 | E 9 | E 8 | E 12 | E 11 | E 15 | — | E 14 | E 17 | NE 8 | ESE 14 | ENE 10 | — | — | — | — | NE 13 | — | NW 8 | NW 9 | — |
| kJ | 2 | 2 | 1 | 3 | 2 | 4 | — | 4 | 24 | 18 | 350 | 65 | — | — | — | — | 142 | — | 104 | 119 | — |
Swell 3 Height (m) Direction Period (s) | — | E 13 | E 12 | — | E 11 | — | — | — | E 13 | E 13 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 3 | 3 | — | 2 | — | — | — | 4 | 4 | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | ENE 5 | E 5 | ENE 5 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 8 | ENE 8 | E 9 | — | — | ENE 6 | ENE 8 | NE 10 | NE 11 | NE 11 | — | — | — | NW 10 |
| kJ | 69 | 106 | 121 | 154 | 113 | 207 | 166 | 250 | 202 | 269 | — | — | 171 | 1536 | 2388 | 2326 | 3671 | — | — | — | 217 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1254 | 449 | 316 | 859 | 859 | 316 | 694 | 888 | 316 | 676 | 0 | 329 | 535 | 639 | 535 | 535 | 676 | 2 | 2 | 2 | 442 |
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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