Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 31 Aug 2026:
- Best quality surf: Thursday 3 Sep, 2AM (local time) - 11ft (3.5m), 11s period, SW swell with cross-onshore winds.
- Most powerful swell: Wednesday 2 Sep, 2PM (local time) - 16ft (5.0m), 12s period, SW swell with 6,810 kJ wave energy.
- Next surfable swell (1★+): Thursday 3 Sep, 2AM (local time) - 11ft (3.5m), 11s 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 Thursday (Sep 03) at 2AM. The primary swell is predicted to be 3.5m and 11s period with a secondary swell of 0.2m and 13s. The wind is predicted to be cross-onshore as the swell arrives.
The most powerful waves expected at Nanwan Beach (South Bay) in the next 16 days are 5.0m 12s and forecast to arrive on Wednesday (Sep 02) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 7s period and expected on Sunday (Sep 06) at 5PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Thu 3rd Sep) | 11ft (3.5m) 11s |
| Best Surf | 2AM (Thu 3rd Sep) | 11ft (3.5m) 11s |
| Most Powerful | 2PM (Wed 2nd Sep) | 16ft (5.0m) 12s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
Short Range ForecastHeavy rain (total 245mm), heaviest during Mon night. Warm (max 28°C on Wed morning, min 26°C on Mon morning). Winds decreasing (near gales from the SW on Tue morning, moderate winds from the SSW by Wed night). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Thu morning. Warm (max 28°C on Thu morning, min 27°C on Thu morning). Winds decreasing (strong winds from the WNW on Thu morning, light winds from the WNW by Sat night). | ||||||||||||||||||||
Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | |||||||||||||||
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 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 11 | SW 12 | SW 11 | SW 10 | W 10 | SW 9 | SW 8 | SW 8 | SSW 8 | SSW 8 | SW 8 | S 8 | SSW 9 | SSW 8 | SSW 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1599 | 2968 | 2668 | 2806 | 2818 | 2324 | 5421 | 6145 | 2672 | 1375 | 753 | 402 | 401 | 306 | 120 | 125 | 78 | 196 | 140 | 59 | 55 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross | cross | cross | cross-on | cross-on | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 8:25AM0.98m | 8:42PM0.91m | 9:04AM0.86m | 9:15PM0.97m | 9:49AM0.72m | 9:55PM1.02m | 10:47AM0.58m | 10:45PM1.05m | 12:37PM0.46m | 11:53PM1.06m | 1:23AM1.08m | 2:52AM1.13m | |||||||||
Low Tide | 2:38PM0.27m | 2:55AM0.24m | 2:56PM0.32m | 3:54AM0.26m | 3:13PM0.37m | 5:07AM0.28m | 3:26PM0.41m | 6:49AM0.28m | 3:21PM0.44m | 8:56AM0.23m | 10:22AM0.15m | ||||||||||
 | |  | | | | | | | |  |  | | |  | | | |  | |  | |
 | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — |
 | — | 6:14 | — | — | 6:13 | — | — | 6:12 | — | — | 6:12 | — | — | 6:10 | — | — | 6:09 | — | — | 6:08 | — |
mm | 38 | 48 | 71 | 28 | 17 | 12 | 7 | 8 | 16 | 2 | — | — | — | — | — | — | — | — | — | — | 5 |
Temp °C | 26 | 27 | 27 | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 27 | 26 | 25 | 24 | 24 | 25 | 28 | 27 | 29 | 28 | 28 | 29 | 30 | 29 | 30 | 30 | 29 | 30 | 29 | 29 | 30 |
Swell 1 Height (m) Direction Period (s) | ENE 12 | ENE 12 | ENE 11 | ENE 11 | E 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | SSW 9 | SW 9 | ENE 11 | SW 8 | SSW 8 | SSW 8 | NE 8 | NE 8 | SSW 9 | SSW 8 | SSW 8 |
| kJ | 48 | 46 | 43 | 38 | 50 | 31 | 58 | 59 | 57 | 54 | 299 | 402 | 64 | 306 | 120 | 125 | 82 | 95 | 140 | 59 | 55 |
Swell 2 Height (m) Direction Period (s) | ENE 8 | — | — | — | — | ENE 11 | E 15 | — | E 13 | SSE 9 | ENE 10 | ENE 10 | SE 9 | ENE 10 | NW 7 | NE 8 | SW 8 | NW 6 | NE 9 | NE 10 | NE 10 |
| kJ | 14 | — | — | — | — | 12 | 4 | — | 14 | 34 | 51 | 97 | 14 | 63 | 23 | 95 | 78 | 16 | 67 | 58 | 58 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | E 16 | — | — | — | — | SE 9 | NW 6 | WSW 8 | NE 8 | SE 9 | NW 5 | NW 7 | ENE 10 | SE 8 | SSE 8 | ENE 10 |
| kJ | — | — | — | — | — | 5 | — | — | — | — | 21 | 11 | 13 | 24 | 12 | 7 | 33 | 20 | 11 | 7 | 9 |
Wind waves Height (m) Direction Period (s) | SSW 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 11 | SW 12 | SW 11 | SW 10 | W 10 | W 9 | SW 8 | — | NE 6 | — | S 8 | S 8 | NW 4 | NW 7 | WNW 5 |
| kJ | 1599 | 2968 | 2668 | 2806 | 2818 | 2324 | 5421 | 6145 | 2672 | 1375 | 753 | 162 | 401 | — | 123 | — | 58 | 196 | 10 | 696 | 120 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 442 | 42 | 535 | 148 | 148 | 148 | 148 | 335 | 42 | 348 | 42 | 42 | 14 | 42 | 2 | 14 | 14 | 42 | 42 | 2 | 2 |
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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