Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 6 Sep 2026:
- Best quality surf: Monday 7 Sep, 8AM (local time) - 3ft (0.9m), 8s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 13 Sep, 5PM (local time) - 13ft (4.0m), 10s period, E swell with 2,938 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 8AM (local time) - 3ft (0.9m), 8s 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 07) at 8AM. The primary swell is predicted to be 0.9m and 8s 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 4.0m 10s and forecast to arrive on Sunday (Sep 13) at 5PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 4.0m 8s period and expected on Sunday (Sep 13) at 11AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Mon 7th Sep) | 3ft (0.9m) 8s |
| Best Surf | 8AM (Mon 7th Sep) | 3ft (0.9m) 8s |
| Most Powerful | 5PM (Sun 13th Sep) | 13ft (4.0m) 10s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s be straight up: this is a lean run for Nanwan Beach for quite a while. The first eleven days are pretty much a washout with hardly any rideable surf, and even when the swell finally shows up, the wind or the size throws up major issues. You’re looking at a long wait until the second week before things get interesting, and even then, there are serious caveats.
The first solid, worthwhile surf doesn’t arrive until Tuesday the 15th of September. Up until then, you’re dealing with tiny waves and messy cross-shore breezes. The weekend of the 13th sees a huge spike in swell energy, but the wind stays strong and cross-shore, making it choppy and unappealing.
Now, Monday the 15th is where you start to pay attention. The morning brings a 7ft SSW swell, period at 12 seconds – proper groundswell – and the energy is pumping. The wind is light, cross-shore, so it’s a bit bumpy, but the real gem is the Tuesday afternoon, the 15th. The wind drops to glassy calm, it’s a 10ft SSW swell with a 13-second period, and the energy is massive. That is serious power, well overhead, wrapping into the point. This is the standout, no question. The water is sitting at 84°, bang on average for the time of year, so you’re in boardies.
But hold up. The very next day, Wednesday the 16th, it goes nuts. A 25ft SSW swell hits in the morning with a 15-second period. That is expert territory only, and even then, the cross-on wind makes it sketchy. The afternoon drops to 15ft, but it’s still a beast. For the average punter, this is a look-and-stay-out session.
After that, the swell fades fast. Thursday the 17th sees an 8ft SSW swell drop to 6ft, but the wind picks up to 30 km/h from the NE, so it gets blown out. The rest of the run into the third week is small, short-period chop and strong winds – not worth the paddle.
Crowds at Nanwan Beach are likely, so for that Tuesday glass-off, you’ll want to be early.
Best bet for the whole period: Tuesday afternoon, the 15th of September – 10ft SSW swell, glassy, long period power. It’ll be solid, heavy, and clean. That’s your window.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Mon morning. Warm (max 28°C on Mon morning, min 25°C on Mon night). Winds increasing (light winds from the NE on Mon morning, fresh winds from the NE by Wed night). | Days 4-6 Weather SummaryLight rain (total 7mm), mostly falling on Sat night. Warm (max 29°C on Fri morning, min 27°C on Thu morning). Winds increasing (moderate winds from the NE on Thu morning, near gales from the NE by Sat afternoon). | ||||||||||||||||||||
Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | |||||||||||||||
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 9 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 7 | SSW 8 | SW 8 | SW 7 | SW 8 | E 17 | E 16 | E 16 | SSW 8 | ESE 11 | SSW 10 | SSW 8 | SSW 11 | E 10 | SSW 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 112 | 100 | 98 | 65 | 65 | 59 | 44 | 39 | 28 | 19 | 17 | 23 | 21 | 21 | 7 | 12 | 36 | 27 | 93 | 2938 | 126 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | 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 | cross | cross |
High Tide | 6:06PM0.54m | 4:04AM1.19m | 6:11PM0.58m | 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 | ||||||||
Low Tide | 11:16AM0.09m | 8:28PM0.52m | 11:56AM0.06m | 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 | |||||||
 | |  |  | |  | | | | | | |  | | | | | | | | | |
 | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — |
 | — | 6:07 | — | — | 6:07 | — | — | 6:06 | — | — | 6:05 | — | — | 6:04 | — | — | 6:02 | — | — | 6:01 | — |
mm | 3 | 1 | 2 | — | 1 | — | — | — | — | — | — | — | — | 1 | 1 | — | — | 5 | 2 | 1 | 1 |
Temp °C | 28 | 28 | 26 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 29 | 29 | 28 | 29 | 29 | 28 | 28 | 28 | 28 |
Feels °C | 30 | 31 | 28 | 31 | 31 | 28 | 29 | 29 | 26 | 27 | 27 | 25 | 27 | 27 | 26 | 24 | 23 | 23 | 23 | 24 | 25 |
Swell 1 Height (m) Direction Period (s) | SW 9 | NE 9 | SW 8 | SW 8 | SW 8 | SW 8 | SW 7 | SSW 8 | SW 8 | SW 7 | SW 8 | SW 8 | SW 10 | SW 9 | NW 8 | ENE 15 | SSW 10 | SSW 8 | SSW 11 | SSW 11 | SE 9 |
| kJ | 112 | 147 | 98 | 65 | 65 | 59 | 44 | 39 | 28 | 19 | 17 | 9 | 14 | 12 | 15 | 74 | 36 | 27 | 93 | 156 | 84 |
Swell 2 Height (m) Direction Period (s) | NE 9 | SW 8 | SE 8 | NE 9 | NE 9 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | E 16 | E 16 | ENE 15 | SSW 10 | ENE 15 | SSW 8 | — | SSW 11 | SSW 11 |
| kJ | 117 | 100 | 3 | 83 | 68 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 21 | 21 | 44 | 10 | 74 | 27 | — | 164 | 126 |
Swell 3 Height (m) Direction Period (s) | NW 4 | NW 4 | E 13 | SSE 8 | ESE 11 | SE 7 | SE 7 | E 12 | NW 7 | E 18 | E 18 | E 17 | ESE 9 | ESE 9 | SSW 8 | ESE 11 | ESE 11 | SSW 8 | — | — | NW 10 |
| kJ | 2 | 1 | 3 | 7 | 11 | 2 | 2 | 3 | 2 | 6 | 6 | 23 | 8 | 8 | 7 | 12 | 11 | 26 | — | — | 4 |
Wind waves Height (m) Direction Period (s) | — | — | NE 9 | NE 3 | NE 3 | NE 9 | NE 9 | NE 5 | NE 6 | NE 7 | NE 7 | NE 8 | NE 7 | NE 7 | NE 7 | NE 6 | ENE 6 | ENE 8 | ENE 8 | E 10 | ENE 8 |
| kJ | — | — | 144 | 2 | 5 | 159 | 156 | 84 | 193 | 371 | 645 | 760 | 479 | 513 | 514 | 301 | 335 | 1051 | 2323 | 2938 | 1281 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 42 | 79 | 0 | 42 | 406 | 79 | 451 | 451 | 497 | 451 | 494 | 442 | 451 | 451 | 316 | 451 | 676 | 535 | 449 | 451 | 316 |
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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