Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 8 Sep 2026:
- Best quality surf: Monday 14 Sep, 5AM (local time) - 3.5ft (1.0m), 9s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 13 Sep, 11AM (local time) - 3.5ft (1.1m), 9s period, SW swell with 190 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 5AM (local time) - 3.5ft (1.0m), 9s 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 (Sep 14) at 5AM. The primary swell is predicted to be 1.0m and 9s period. 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 1.1m 9s and forecast to arrive on Sunday (Sep 13) 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 2.5m 7s period and expected on Thursday (Sep 10) at 8PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Mon 14th Sep) | 3.5ft (1.0m) 9s |
| Best Surf | 5AM (Mon 14th Sep) | 3.5ft (1.0m) 9s |
| Most Powerful | 11AM (Sun 13th Sep) | 3.5ft (1.1m) 9s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Hey, Rusty here again. Same story for Nanwan Beach (South Bay). The first week and a half is a total bust – tiny waves, cross-off winds, nothing worth paddling out for. From September 9th through the 19th you’re looking at ankle-biters in the 0.6 to 1ft range, with only a few sessions on the 13th and 14th offering marginal 3–4ft SW swell. The 20th shows a bump to 4ft from the east-northeast, but it’s short-period and pretty average. Save your energy.
The real deal hits September 22nd. A solid east groundswell rolls in with 7–7ft faces and a long 14-second interval. The combined energy is massive – in the thousands – so it’s packing punch. This is expert territory: anything over 5ft gets serious, and here we’re pushing 7ft. The wind finally plays nice: Tuesday afternoon (22nd) gets a light offshore from the northwest, Wednesday morning (23rd) a cross-off from the west-northwest, and Wednesday afternoon turns glassy with a whisper of a northwest breeze. Clean, lined-up waves.
Swell direction is east – not quite the preferred southeast, but close. That long period will give the waves some extra push, but on a beach-and-reef setup they can run a bit straight. The reef might help. Crowds? You bet – this place gets busy often, and with waves like that it’ll be a zoo. But if you’ve got the skills and want the best of the forecast, the 22nd afternoon through the 23rd afternoon are your golden window. After that, the 24th is trashed by a near-gale offshore blowing out tiny 1ft leftovers. Get it while it’s good.
Rusty.
Short Range ForecastMostly dry. Warm (max 29°C on Fri afternoon, min 26°C on Tue night). Winds increasing (light winds from the ENE on Tue night, strong winds from the NE by Thu night). | Days 5-7 Weather SummaryModerate rain (total 10mm), heaviest on Sat morning. Warm (max 29°C on Sat morning, min 27°C on Fri night). Winds decreasing (fresh winds from the NE on Fri night, light winds from the WNW by Mon afternoon). | ||||||||||||||||||
Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | ||||||||||||||
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 8 | SW 7 | SSW 8 | SW 8 | SW 7 | SW 8 | SW 8 | SW 9 | SW 9 | SW 8 | SSW 9 | SSW 9 | SSW 8 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 46 | 44 | 39 | 28 | 14 | 14 | 9 | 21 | 21 | 16 | 100 | 111 | 105 | 190 | 178 | 152 | 145 | 123 | 100 |
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 | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off |
High Tide | 5:02AM1.23m | 6:29PM0.63m | 5:52AM1.23m | 6:50PM0.71m | 6:37AM1.19m | 7:14PM0.79m | 7:18AM1.10m | 7:38PM0.87m | 7:56AM0.99m | 8:04PM0.95m | 8:33AM0.86m | 8:31PM1.00m | |||||||
Low Tide | 10:01PM0.44m | 12:30PM0.06m | 11:05PM0.36m | 12:59PM0.09m | 11:59PM0.28m | 1:24PM0.15m | 00:48AM0.23m | 1:45PM0.21m | 1:36AM0.20m | 2:02PM0.28m | 2:23AM0.20m | 2:15PM0.33m | 3:11AM0.23m | ||||||
 |  | | | | |  |  | |  |  | | | | | | | | | |
 | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — |
 | 6:07 | — | 6:06 | — | — | 6:05 | — | — | 6:04 | — | — | 6:02 | — | — | 6:01 | — | — | 6:00 | — |
mm | — | — | — | — | — | — | — | — | — | 3 | 3 | — | 2 | — | — | — | — | 2 | 2 |
Temp °C | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 27 | 29 | 29 | 28 |
Feels °C | 28 | 27 | 28 | 26 | 26 | 27 | 24 | 27 | 30 | 28 | 29 | 30 | 29 | 30 | 30 | 28 | 32 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SW 7 | SSW 8 | SW 8 | SW 7 | SW 8 | SW 8 | SW 9 | SW 9 | NW 8 | SSW 9 | SSW 9 | SSW 8 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 8 |
| kJ | 46 | 44 | 39 | 28 | 14 | 14 | 9 | 20 | 19 | 15 | 100 | 111 | 105 | 190 | 178 | 152 | 145 | 123 | 100 |
Swell 2 Height (m) Direction Period (s) | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | NNW 7 | ESE 9 | ESE 9 | ENE 15 | ENE 15 | ENE 15 | E 14 | E 14 | E 14 | E 14 | E 14 | E 13 | E 13 |
| kJ | 10 | 10 | 10 | 10 | 9 | 9 | 5 | 8 | 8 | 44 | 74 | 74 | 100 | 103 | 98 | 101 | 100 | 92 | 90 |
Swell 3 Height (m) Direction Period (s) | SE 7 | SE 7 | E 12 | NW 7 | E 18 | E 18 | ESE 10 | E 16 | E 16 | SW 8 | ESE 9 | ESE 10 | SE 8 | ESE 10 | ESE 10 | E 10 | SW 10 | WSW 9 | NW 7 |
| kJ | 2 | 2 | 3 | 2 | 6 | 6 | 9 | 21 | 21 | 16 | 8 | 10 | 10 | 10 | 10 | 16 | 24 | 34 | 2 |
Wind waves Height (m) Direction Period (s) | NE 9 | NE 5 | NE 5 | NE 6 | NE 6 | NE 7 | NE 7 | NE 7 | NE 6 | NE 6 | NE 6 | NE 6 | ENE 5 | ENE 5 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 7 |
| kJ | 117 | 60 | 66 | 236 | 296 | 452 | 574 | 363 | 255 | 248 | 138 | 133 | 64 | 55 | 90 | 105 | 87 | 123 | 230 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 79 | 451 | 451 | 497 | 451 | 853 | 449 | 451 | 449 | 329 | 643 | 476 | 316 | 676 | 451 | 335 | 0 | 0 | 348 |
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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