Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 18 Oct 2026:
- Best quality surf: Wednesday 21 Oct, 8PM (local time) - 11ft (3.5m), 18s period, ESE swell with cross-offshore winds.
- Most powerful swell: Saturday 24 Oct, 5AM (local time) - 48ft (14.5m), 15s period, ESE swell with 88,663 kJ wave energy.
- Next surfable swell (1★+): Tuesday 20 Oct, 2PM (local time) - 4.5ft (1.3m), 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 1.3m and 9s period with a secondary swell of 0.7m and 15s. 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 14.5m 15s and forecast to arrive on Saturday (Oct 24) 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 15.0m 16s period and expected on Saturday (Oct 24) at 2AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Tue 20th Oct) | 4.5ft (1.3m) 9s |
| Best Surf | 8PM (Wed 21st Oct) | 11ft (3.5m) 18s |
| Most Powerful | 5AM (Sat 24th Oct) | 48ft (14.5m) 15s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
Short Range ForecastMostly dry. Warm (max 29°C on Mon afternoon, min 26°C on Tue night). Winds decreasing (fresh winds from the NE on Sun night, light winds from the NE by Tue afternoon). | Days 4-6 Weather SummaryHeavy rain (total 103mm), heaviest during Fri night. Warm (max 29°C on Wed morning, min 25°C on Wed night). Winds increasing (light winds from the WNW on Thu night, severe gales from the SSW by Fri night). | ||||||||||||||||||||
Sunday 18 | Monday 19 | Tuesday 20 | Wednesday 21 | Thursday 22 | Friday 23 | Saturday 24 | |||||||||||||||
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 6 | ENE 6 | ENE 6 | ENE 6 | ESE 10 | ENE 5 | E 9 | E 15 | E 16 | ESE 17 | ESE 17 | E 19 | E 18 | E 17 | E 16 | E 16 | ENE 17 | E 16 | SSE 12 | SSW 11 | WSW 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 106 | 113 | 239 | 239 | 10 | 117 | 263 | 465 | 2434 | 4035 | 5250 | 18404 | 21047 | 18053 | 16384 | 21951 | 0 | 0 | 26848 | 7140 | 1045 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | 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-on | cross-on | cross-on |
High Tide | 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 | 5:12AM0.93m | 5:32PM0.93m | ||||||||||
Low Tide | 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 | 11:24AM0.27m | 11:47PM0.20m | ||||||||||
 | |  | | | | | | | | |  |  | | | |  |  |  | |  | |
 | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:56 | — | — | 5:56 | — | — |
 | — | 5:30 | — | — | 5:29 | — | — | 5:28 | — | — | 5:27 | — | — | 5:25 | — | — | 5:25 | — | — | 5:24 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 102 | 29 | 13 | 9 |
Temp °C | 28 | 28 | 27 | 28 | 29 | 27 | 29 | 29 | 27 | 29 | 28 | 26 | 27 | 26 | 26 | 27 | 28 | 26 | 25 | 26 | 27 |
Feels °C | 28 | 29 | 28 | 27 | 30 | 28 | 30 | 32 | 28 | 29 | 28 | 23 | 28 | 23 | 26 | 25 | 25 | 21 | 16 | 26 | 29 |
Swell 1 Height (m) Direction Period (s) | E 12 | ENE 11 | SE 11 | SE 10 | ESE 10 | ESE 10 | E 15 | E 9 | E 16 | ESE 17 | ESE 17 | E 19 | E 18 | E 17 | E 16 | E 16 | ENE 17 | — | ENE 10 | ENE 9 | WSW 10 |
| kJ | 3 | 12 | 5 | 4 | 10 | 9 | 165 | 270 | 2434 | 4035 | 5250 | 18404 | 21047 | 18053 | 16384 | 21951 | 51303 | — | 448 | 197 | 1045 |
Swell 2 Height (m) Direction Period (s) | E 12 | E 11 | — | — | E 14 | E 18 | ENE 8 | E 15 | ENE 10 | — | — | — | — | — | NE 12 | NE 14 | — | — | — | E 10 | SSW 8 |
| kJ | 3 | 2 | — | — | 4 | 24 | 28 | 465 | 39 | — | — | — | — | — | 3335 | 4335 | — | — | — | 18 | 416 |
Swell 3 Height (m) Direction Period (s) | — | E 11 | — | — | — | E 13 | E 14 | — | — | — | — | — | — | — | — | — | — | — | — | — | SE 10 |
| kJ | — | 2 | — | — | — | 4 | 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | 546 |
Wind waves Height (m) Direction Period (s) | E 6 | ENE 6 | ENE 6 | ENE 6 | ENE 8 | ENE 5 | E 9 | — | NE 5 | NE 6 | ENE 8 | NE 10 | NE 11 | NE 12 | NNE 12 | NE 13 | ENE 17 | E 16 | SSE 12 | SSW 11 | — |
| kJ | 106 | 113 | 239 | 239 | 244 | 117 | 263 | — | 49 | 148 | 1313 | 2262 | 3282 | 4362 | 7623 | 11205 | 73592 | 107126 | 26848 | 7140 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 694 | 859 | 316 | 694 | 861 | 316 | 676 | 0 | 2 | 535 | 676 | 535 | 535 | 676 | 535 | 442 | 442 | 572 | 449 | 535 | 148 |
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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