Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 29 Aug 2026:
- Best quality surf: Tuesday 1 Sep, 5PM (local time) - 11ft (3.5m), 10s period, SW swell with cross-offshore winds.
- Most powerful swell: Wednesday 2 Sep, 2AM (local time) - 16ft (5.0m), 10s period, SW swell with 4,430 kJ wave energy.
- Next surfable swell (1★+): Monday 31 Aug, 2AM (local time) - 7ft (2.2m), 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 (Aug 31) at 2AM. The primary swell is predicted to be 2.2m 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 5.0m 10s and forecast to arrive on Wednesday (Sep 02) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.3m 7s period and expected on Friday (Sep 04) at 11AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Mon 31st Aug) | 7ft (2.2m) 9s |
| Best Surf | 5PM (Tue 1st Sep) | 11ft (3.5m) 10s |
| Most Powerful | 2AM (Wed 2nd Sep) | 16ft (5.0m) 10s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's get into it for Nanwan Beach (South Bay). We've got a bit of a mixed bag coming our way over the next couple of weeks, so let's break it down.
The water temp is sitting right on 84°F, which is pretty much spot on for this time of year, so you won't need any extra rubber.
The first real standout window kicks off Monday afternoon, August 31st. We've got a solid 8ft SSW swell with a 10-second period, and the wind is light and offshore from the NE. That's going to be clean and offer some proper shape. The combined energy is a solid moderate 1193, so there's some grunt in the water. This is the best bet for the foreseeable future if you're an intermediate surfer.
Now, Tuesday afternoon, September 1st, is a different story. The swell is pumping at 12ft from the SW, and the energy is a massive 2304—that's strong. But the catch is, it's simply too big for this break. This is strictly for experts only, and even then, it's going to be a handful. The wind is offshore, so it'll be clean, but it's a big, heavy wave.
After that, the swell drops off significantly. We go through a long stretch from Wednesday, September 2nd, right through to the end of the forecast where the conditions are mostly poor or very ordinary. The swell gets small, the wind swings around, and there's just not much to get excited about. There's a brief moment on Friday, September 4th, with a glassy 4ft SSW swell in the morning, but it's really small and the energy is weak at 252.
For the first week of September, the southerly swells are small and the wind is often messy. You'll see some clean conditions from time to time, but the waves just aren't there. The combined energy values drop into the double digits by the second week, meaning the surf is tiny and weak. The only real option is to wait for a day when the wind is light and the swell is just over 3ft, but it's a gamble.
So, to sum it up: your best chance is Monday afternoon, August 31st. After that, it's a long wait for anything decent. The forecast for the second week is pretty bleak, with very little size and energy. Keep an eye on the charts, but don't hold your breath.
Rusty.
Short Range ForecastHeavy rain (total 222mm), heaviest during Tue morning. Warm (max 28°C on Sat afternoon, min 25°C on Tue morning). Mainly strong winds. | Days 5-7 Weather SummaryHeavy rain (total 23mm), heaviest during Tue afternoon. Warm (max 29°C on Thu morning, min 27°C on Tue afternoon). Winds decreasing (strong winds from the NW on Wed afternoon, calm by Fri morning). | |||||||||||||||||||
Sat 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | ||||||||||||||
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 8 | SSW 9 | SW 9 | SSW 9 | SW 9 | SW 9 | SW 10 | SW 9 | SW 10 | SW 10 | SW 10 | SSW 10 | SSW 11 | SSW 10 | SW 10 | SW 9 | SW 10 | SW 9 | SW 9 | SSW 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 653 | 909 | 743 | 739 | 743 | 885 | 1185 | 1464 | 1480 | 2304 | 4430 | 1450 | 2664 | 1207 | 602 | 456 | 334 | 237 | 170 | 123 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | on | cross-off | cross-on | cross-off | cross-on | on | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | off | glassy | off | cross-off |
High Tide | 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 | 10:47AM0.58m | 10:45PM1.05m | 12:37PM0.46m | 11:53PM1.06m | |||||||
Low Tide | 1:18AM0.26m | 2:19PM0.22m | 2:05AM0.24m | 2:38PM0.27m | 2:55AM0.24m | 2:56PM0.32m | 3:54AM0.26m | 3:13PM0.37m | 5:07AM0.28m | 3:26PM0.41m | 6:49AM0.28m | 3:21PM0.44m | ||||||||
 |  | | | | |  |  | | | |  | |  |  | |  |  | | | |
 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — |
 | 6:15 | — | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — | — | 6:12 | — | — | 6:12 | — | — | 6:10 | — |
mm | 4 | 10 | 3 | 3 | 5 | 3 | 9 | 30 | 155 | 14 | 7 | — | 1 | — | — | — | — | 1 | 4 | 8 |
Temp °C | 28 | 28 | 28 | 27 | 27 | 28 | 27 | 27 | 27 | 27 | 28 | 28 | 28 | 27 | 29 | 29 | 28 | 28 | 28 | 28 |
Feels °C | 30 | 31 | 33 | 31 | 31 | 30 | 30 | 30 | 25 | 27 | 31 | 27 | 27 | 25 | 29 | 30 | 30 | 31 | 33 | 33 |
Swell 1 Height (m) Direction Period (s) | ENE 12 | ENE 13 | SW 9 | SSW 9 | SW 9 | E 12 | E 12 | ENE 11 | SW 10 | ENE 9 | ENE 10 | SSW 10 | SSW 11 | SSW 10 | SW 10 | SW 9 | SW 10 | SW 9 | SW 9 | SSW 8 |
| kJ | 28 | 59 | 743 | 739 | 743 | 72 | 70 | 93 | 1480 | 69 | 54 | 1450 | 2664 | 1207 | 602 | 456 | 334 | 237 | 170 | 123 |
Swell 2 Height (m) Direction Period (s) | ENE 15 | ENE 8 | ENE 13 | ENE 13 | ENE 12 | ENE 12 | SE 10 | — | ENE 9 | — | E 16 | WSW 9 | ENE 10 | ENE 10 | NE 10 | NE 10 | ENE 11 | ENE 11 | ENE 10 | NE 8 |
| kJ | 21 | 6 | 68 | 95 | 83 | 82 | 4 | — | 92 | — | 5 | 277 | 37 | 69 | 102 | 102 | 101 | 128 | 158 | 129 |
Swell 3 Height (m) Direction Period (s) | — | — | SE 9 | SSE 9 | SE 10 | — | SE 10 | — | ENE 11 | — | — | ENE 10 | E 14 | ENE 13 | SE 10 | SE 10 | SE 10 | SE 10 | SE 9 | ENE 10 |
| kJ | — | — | 13 | 7 | 4 | — | 4 | — | 64 | — | — | 55 | 15 | 17 | 24 | 25 | 15 | 15 | 14 | 75 |
Wind waves Height (m) Direction Period (s) | SSW 8 | SSW 9 | — | — | — | SW 9 | SW 10 | SW 9 | WSW 10 | SW 10 | SW 10 | — | — | NW 6 | NW 6 | W 6 | WNW 6 | NW 7 | NW 6 | WNW 6 |
| kJ | 653 | 909 | — | — | — | 885 | 1185 | 1464 | 299 | 2304 | 4430 | — | — | 216 | 67 | 121 | 164 | 471 | 245 | 47 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 14 | 14 | 14 | 14 | 0 | 639 | 0 | 335 | 148 | 348 | 148 | 42 | 42 | 42 | 42 | 2 | 0 | 0 | 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.
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