Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 27 Aug 2026:
- Best quality surf: Wednesday 2 Sep, 5PM (local time) - 10ft (3.0m), 10s period, SW swell with glassy winds.
- Most powerful swell: Wednesday 2 Sep, 8PM (local time) - 10ft (3.0m), 10s period, SW swell with 1,573 kJ wave energy.
- Next surfable swell (1★+): Saturday 29 Aug, 5AM (local time) - 5.5ft (1.7m), 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 Saturday (Aug 29) at 5AM. The primary swell is predicted to be 1.7m 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 3.0m 10s and forecast to arrive on Wednesday (Sep 02) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.1m 6s period and expected on Thursday (Sep 03) at 8PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Sat 29th Aug) | 5.5ft (1.7m) 9s |
| Best Surf | 5PM (Wed 2nd Sep) | 10ft (3.0m) 10s |
| Most Powerful | 8PM (Wed 2nd Sep) | 10ft (3.0m) 10s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, let’s get into it. The long-range charts have been lighting up a bit, but it’s a slow burner to start. We’ve got a stretch of blank days ahead before things start to move. The first real window of opportunity doesn’t show up until late in the week, and it’s got a lot of cleaning up to do before it turns on.
Initially, we’re looking at a few days of decent-sized but messy swell. The wind is going to be the problem, messing up what could otherwise be a fun run of waves. Think chest to head high surf, but with a cross-off breeze that’s just not letting it get its act together. The water’s sitting at a warm 84°, which is pretty much spot on for this time of year. Nothing weird going on there.
Then we hit a proper lull. From around the start of September through to the 9th, there’s just nothing doing. The ocean goes almost flat, with only tiny, weak pulses of energy. It’s a real dead spell, and you’d be wasting your time even looking at it. It’s a long few days of nothing, so maybe catch up on some waxing or fix that fin you’ve been meaning to.
Now, here’s where it gets interesting. Late on Wednesday the 2nd, the whole game changes. A significant pulse of energy arrives, with the combined swell energy jumping to 2765 – that’s some serious juice. The swell builds to a solid 10ft, and the wind drops right out to glassy conditions. This is a standout window for experienced surfers. It’s a powerful, clean swell, but 10ft is proper heavy, expert-only territory. This is the best the period has to offer, no question. The direction is from the SW, which is solid for the spot.
That peak fades through Thursday, still holding good size but with a bit more wind influence. Then it starts to taper off into the weekend, dropping back down and getting smaller.
Then we look to the middle of the second week. On the 10th, the swell builds again, not as big as the 2nd, but it looks super clean. Light offshore winds and a steady 6-6ft SW swell. This is a much more manageable size for the average surfer, and the conditions look prime. This is your other highlight of the whole run. It’s less powerful than the Wednesday event, but for most people, it’s going to be the more fun, makeable day. All in all, we’ve got two distinct windows worth paddling out for, with a whole lot of nothing in between.
Rusty
Short Range ForecastLight rain (total 7mm), mostly falling on Thu night. Warm (max 29°C on Fri afternoon, min 28°C on Thu afternoon). Winds decreasing (fresh winds from the W on Thu afternoon, calm by Sat night). | Days 5-7 Weather SummaryHeavy rain (total 25mm), heaviest during Tue night. Warm (max 30°C on Sun afternoon, min 27°C on Sun night). Mainly strong winds. | |||||||||||||||||||
Thu 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | ||||||||||||||
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 8 | SW 8 | SW 8 | SW 8 | SW 9 | SW 9 | SSW 9 | SW 9 | SW 9 | SSW 10 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 10 | SW 10 | WSW 11 | SW 10 | SW 10 |
Wave Graph | ||||||||||||||||||||
517 | 517 | 579 | 532 | 430 | 482 | 591 | 528 | 502 | 772 | 502 | 437 | 456 | 446 | 491 | 614 | 557 | 742 | 1492 | 1367 | |
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 | glassy | cross | cross-off | cross-off | cross-off | cross-off | cross | cross | cross | cross-off | cross-off | glassy | cross-off |
High Tide | 7:06PM0.64m | 6:38AM1.18m | 7:26PM0.70m | 7:13AM1.14m | 7:49PM0.76m | 7:48AM1.08m | 8:14PM0.84m | 8:25AM0.98m | 8:42PM0.91m | 9:04AM0.86m | 9:15PM0.97m | 9:49AM0.72m | 9:55PM1.02m | |||||||
Low Tide | 11:51PM0.35m | 1:39PM0.15m | 00:35AM0.30m | 2:00PM0.18m | 1:18AM0.26m | 2:19PM0.22m | 2:05AM0.24m | 2:38PM0.27m | 2:55AM0.24m | 2:56PM0.32m | 3:54AM0.26m | 3:13PM0.37m | ||||||||
— | — | 5:37 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | |
6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — | — | 6:12 | — | |
mm | — | 4 | 1 | — | 1 | — | — | 1 | — | 1 | — | — | — | 5 | — | 1 | 16 | 2 | 3 | 1 |
Temp °C | 28 | 28 | 28 | 29 | 28 | 29 | 29 | 29 | 29 | 30 | 28 | 29 | 29 | 28 | 28 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 28 | 28 | 28 | 30 | 31 | 33 | 32 | 34 | 31 | 32 | 28 | 30 | 30 | 30 | 27 | 26 | 25 | 30 | 31 | 28 |
Swell 1 Height (m) Direction Period (s) | NE 11 | NNE 11 | ENE 13 | SW 8 | SW 9 | SW 9 | SSW 9 | SW 9 | SW 9 | SSW 10 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 10 | SW 10 | WSW 11 | SSW 10 | SW 10 |
59 | 47 | 55 | 532 | 430 | 482 | 591 | 528 | 502 | 772 | 502 | 437 | 456 | 446 | 491 | 614 | 557 | 742 | 706 | 1367 | |
Swell 2 Height (m) Direction Period (s) | ENE 13 | ENE 13 | NNE 11 | ENE 12 | ENE 12 | ENE 12 | ENE 12 | ENE 13 | SSW 11 | E 8 | E 12 | E 10 | SE 5 | ENE 10 | ENE 10 | ENE 9 | WSW 11 | SSW 9 | WSW 10 | NE 9 |
35 | 58 | 11 | 30 | 28 | 28 | 27 | 59 | 143 | 29 | 73 | 92 | 1 | 333 | 263 | 201 | 435 | 402 | 567 | 61 | |
Swell 3 Height (m) Direction Period (s) | E 9 | ESE 10 | SE 10 | SE 10 | ESE 10 | ENE 15 | SSE 9 | SE 8 | ENE 8 | ENE 13 | SSE 8 | E 12 | SSE 9 | SSE 8 | SSE 9 | SSE 9 | ENE 9 | NE 9 | ENE 9 | ENE 9 |
7 | 10 | 4 | 4 | 9 | 21 | 8 | 11 | 25 | 55 | 7 | 72 | 8 | 7 | 8 | 8 | 141 | 77 | 68 | 58 | |
Wind waves Height (m) Direction Period (s) | SW 8 | SW 8 | SW 8 | — | — | — | — | — | — | — | NE 4 | NE 5 | ENE 10 | — | — | W 3 | — | — | SW 10 | — |
517 | 517 | 579 | — | — | — | — | — | — | — | 15 | 35 | 331 | — | — | 6 | — | — | 1492 | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 42 | 42 | 363 | 42 | 14 | 0 | 0 | 0 | 79 | 79 | 316 | 348 | 79 | 348 | 1160 | 535 | 442 | 390 | 0 | 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.











