Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 20 Jul 2026:
- Best quality surf: Sunday 26 Jul, 2PM (local time) - 7ft (2.2m), 12s period, ESE swell with cross-offshore winds.
- Most powerful swell: Monday 27 Jul, 2PM (local time) - 10ft (3.0m), 13s period, E swell with 2,989 kJ wave energy.
- Next surfable swell (1★+): Monday 20 Jul, 8PM (local time) - 3.5ft (1.1m), 7s 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 Monday (Jul 20) at 8PM. The primary swell is predicted to be 1.1m and 7s period with a secondary swell of 0.2m and 9s. 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 3.0m 13s and forecast to arrive on Monday (Jul 27) at 2PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 6s period and expected on Sunday (Jul 26) at 8PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Mon 20th Jul) | 3.5ft (1.1m) 7s |
| Best Surf | 2PM (Sun 26th Jul) | 7ft (2.2m) 12s |
| Most Powerful | 2PM (Mon 27th Jul) | 10ft (3.0m) 13s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
Short Range ForecastLight rain (total 5mm), mostly falling on Mon morning. Warm (max 29°C on Mon morning, min 28°C on Mon morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 30°C on Sat afternoon, min 27°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 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) | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | ESE 11 | ESE 12 | E 12 | E 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 105 | 113 | 116 | 100 | 89 | 71 | 49 | 51 | 38 | 29 | 30 | 23 | 16 | 18 | 16 | 17 | 18 | 270 | 1072 | 1644 | 2166 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross | cross | cross-off | cross-off | cross | cross-off | cross-off | cross-on | cross | cross-on | cross-on | glassy | cross-off | off | off | cross-off | cross-off | cross-off | cross-off |
High Tide | 10:46AM0.84m | 11:52PM0.80m | 11:37AM0.68m | 00:40AM0.86m | 12:53PM0.55m | 1:33AM0.92m | 3:19PM0.48m | 2:28AM0.96m | 3:22AM1.01m | 4:12AM1.07m | 6:57PM0.52m | 4:58AM1.12m | |||||||||
Low Tide | 5:18PM0.34m | 6:03AM0.46m | 5:34PM0.40m | 7:58AM0.44m | 5:44PM0.44m | 9:54AM0.38m | 5:47PM0.47m | 11:05AM0.30m | 11:49AM0.23m | 12:24PM0.18m | 9:09PM0.50m | ||||||||||
 |  |  | |  |  | | | | | | | | | | | | | | |  | |
 | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — |
 | — | 6:42 | — | — | 6:40 | — | — | 6:40 | — | — | 6:40 | — | — | 6:39 | — | — | 6:39 | — | — | 6:38 | — |
mm | 2 | — | 2 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 4 |
Temp °C | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 30 | 28 | 29 | 30 | 28 |
Feels °C | 31 | 31 | 31 | 32 | 31 | 31 | 33 | 32 | 32 | 33 | 32 | 33 | 32 | 32 | 30 | 32 | 34 | 30 | 33 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | SW 7 | E 10 | ENE 10 | ENE 10 | ENE 10 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | E 5 | E 5 | ESE 11 | ESE 12 | E 12 | E 12 |
| kJ | 105 | 17 | 18 | 18 | 18 | 71 | 49 | 51 | 38 | 29 | 30 | 23 | 16 | 18 | 16 | 11 | 12 | 270 | 1072 | 1644 | 2166 |
Swell 2 Height (m) Direction Period (s) | E 10 | ESE 9 | ESE 8 | ESE 8 | ESE 8 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 10 | NE 10 | NE 10 | ENE 10 | NE 10 | SW 7 | SW 7 | WSW 7 | — |
| kJ | 17 | 8 | 7 | 7 | 6 | 18 | 18 | 17 | 17 | 16 | 16 | 16 | 22 | 27 | 25 | 38 | 25 | 8 | 13 | 20 | — |
Swell 3 Height (m) Direction Period (s) | ESE 9 | E 12 | E 13 | S 7 | S 7 | SE 8 | SE 8 | SE 8 | E 9 | E 10 | E 10 | ENE 12 | E 10 | E 10 | ESE 10 | SW 7 | SW 7 | ENE 10 | ENE 9 | SW 7 | — |
| kJ | 8 | 3 | 3 | 1 | 1 | 3 | 2 | 2 | 2 | 8 | 8 | 13 | 8 | 8 | 9 | 17 | 18 | 19 | 17 | 8 | — |
Wind waves Height (m) Direction Period (s) | — | SW 7 | SW 7 | SW 7 | SW 7 | — | SSE 3 | — | — | — | — | — | — | — | E 3 | NNE 3 | NW 3 | ENE 5 | NW 4 | NW 4 | WSW 7 |
| kJ | — | 113 | 116 | 100 | 89 | — | 1 | — | — | — | — | — | — | — | 8 | 2 | 3 | 78 | 15 | 11 | 27 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 14 | 14 | 2 | 14 | 922 | 2 | 2 | 2 | 2 | 838 | 2 | 329 | 79 | 2 | 999 | 2 | 2 | 0 | 0 | 511 | 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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