Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 21 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 2AM (local time) - 4ft (1.2m), 18s period, E swell with glassy winds.
- Most powerful swell: Tuesday 25 Aug, 2PM (local time) - 7.5ft (2.3m), 17s period, E swell with 3,157 kJ wave energy.
- Next surfable swell (1★+): Monday 24 Aug, 11AM (local time) - 7.5ft (2.3m), 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 24) at 11AM. The primary swell is predicted to be 2.3m and 9s period with a secondary swell of 0.6m and 8s. Another secondary swell of 0.4m and 14s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Nanwan Beach (South Bay) in the next 16 days are 2.3m 17s and forecast to arrive on Tuesday (Aug 25) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.2m 16s period and expected on Tuesday (Aug 25) at 11PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Mon 24th Aug) | 7.5ft (2.3m) 9s |
| Best Surf | 2AM (Tue 25th Aug) | 4ft (1.2m) 18s |
| Most Powerful | 2PM (Tue 25th Aug) | 7.5ft (2.3m) 17s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Right folks, Rusty here, and I’ve got the lowdown for the next couple of weeks. It’s a bit of a mixed bag, but there are a couple of windows that are going to make it all worthwhile.
We’re starting off slow. The first few days are pretty average, with a lot of risk of thunderstorms and funky winds messing up the swell, so we’re just sitting through Saturday the 22nd and Sunday the 23rd. Nothing doing there.
The first real glimmer comes Monday morning, August 24th. We’re looking at a clean 2.3m swell (that’s about 8ft) from the SW at Nanwan Beach (South Bay). The wind goes glassy, and the water temps are about average for this time of year. That sets us up for a nice, clean session, though the 9-second period isn't going to have heaps of push.
Now, the real standout in this whole outlook is Tuesday morning, August 25th. We’ve got a big, long-period groundswell pushing in from the East at 2.1m (around 7ft), with a period of 18 seconds. The combined energy is strong at 3436. This is a proper groundswell, and it’s going to hold up well at Nanwan’s reef setup. The wind is a clean offshore from the SE, so expect some beautiful, lined-up waves. This is definitely one for the experienced crew only though, as that energy isn't messing around.
The following week keeps things ticking over. Thursday afternoon, August 27th, looks sweet with clean 1.8m (6ft) SW swell and glassy conditions. Then we have a promising long-range call for Monday, August 31st. The afternoon session is looking like a gem for experienced surfers. We’ve got a 2.2m (7ft) SSW groundswell with a very long 13-second period, pushing a lot of energy (2497). The wind goes glassy again. It’s a bit far out, so keep an eye on it, but the potential is there.
After that, things start to fade. The first few days of September have some clean but smaller SW swell in the 4ft to 5ft range with good offshores, and by the end of the first week of September, the swell really drops off and we're left with small, weak waves. So, to sum it up: don't bother with this weekend, hold out for next Monday morning, and keep a very close eye on that Monday the 31st.
Rusty.
Short Range ForecastHeavy rain (total 427mm), heaviest during Sun afternoon. Warm (max 27°C on Fri night, min 25°C on Mon afternoon). Winds decreasing (fresh winds from the WSW on Sun afternoon, calm by Mon morning). | Days 5-7 Weather SummaryHeavy rain (total 251mm), heaviest during Mon night. Warm (max 29°C on Wed morning, min 25°C on Mon night). Wind will be generally light. | ||||||||||||||||||
Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | ||||||||||||||
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 10 | SW 10 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 8 | E 18 | E 18 | E 16 | SW 9 | SW 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 |
Wave Graph  | |||||||||||||||||||
 kJ | 1790 | 1238 | 1137 | 1099 | 974 | 996 | 720 | 834 | 962 | 875 | 2734 | 2605 | 626 | 526 | 652 | 535 | 524 | 587 | 569 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | cross | cross-on | cross | cross | glassy | cross-on | glassy | on | cross | cross-on | cross | cross-off | cross | off | glassy | cross |
High Tide | 1:28AM0.95m | 2:47AM0.98m | 3:51AM1.03m | 6:41PM0.54m | 4:42AM1.09m | 6:38PM0.56m | 5:24AM1.14m | 6:49PM0.59m | 6:02AM1.17m | 7:06PM0.64m | |||||||||
Low Tide | 11:01AM0.29m | 11:37AM0.24m | 12:05PM0.19m | 9:07PM0.52m | 12:31PM0.16m | 10:17PM0.46m | 12:55PM0.14m | 11:07PM0.40m | 1:18PM0.14m | 11:51PM0.35m | |||||||||
 |  | | |  | | | |  | | | |  |  | |  |  | | | |
 | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — |
 | 6:22 | — | 6:22 | — | — | 6:21 | — | — | 6:21 | — | — | 6:20 | — | — | 6:19 | — | — | 6:17 | — |
mm | 29 | 9 | 6 | 13 | 54 | 122 | 78 | 35 | 81 | 179 | 54 | 16 | 1 | — | — | — | 1 | — | 1 |
Temp °C | 27 | 27 | 27 | 27 | 26 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 27 | 29 | 29 | 28 | 29 | 29 | 29 |
Feels °C | 28 | 28 | 29 | 31 | 28 | 28 | 29 | 29 | 29 | 27 | 28 | 30 | 29 | 34 | 32 | 32 | 33 | 33 | 34 |
Swell 1 Height (m) Direction Period (s) | NE 9 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | SE 7 | SW 9 | ESE 8 | SE 7 | SW 9 | E 18 | E 16 | ENE 16 | SW 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 |
| kJ | 3 | 10 | 20 | 20 | 19 | 44 | 720 | 37 | 27 | 795 | 2734 | 2605 | 2161 | 526 | 652 | 535 | 524 | 587 | 569 |
Swell 2 Height (m) Direction Period (s) | — | NE 8 | NE 8 | NE 9 | E 9 | E 14 | ESE 6 | ESE 14 | ESE 13 | E 18 | SW 9 | SW 9 | NE 8 | ENE 14 | ENE 14 | ENE 12 | NE 12 | NE 12 | NNE 11 |
| kJ | — | 3 | 3 | 3 | 2 | 16 | 27 | 69 | 60 | 875 | 702 | 736 | 78 | 1223 | 829 | 299 | 205 | 134 | 81 |
Swell 3 Height (m) Direction Period (s) | — | — | NE 8 | NE 8 | — | E 16 | E 14 | ENE 9 | E 18 | E 12 | NE 10 | NE 7 | — | SSE 9 | SE 9 | SSE 8 | ENE 14 | ENE 13 | ENE 13 |
| kJ | — | — | 3 | 3 | — | 5 | 15 | 8 | 107 | 110 | 27 | 17 | — | 7 | 12 | 6 | 40 | 35 | 58 |
Wind waves Height (m) Direction Period (s) | SW 10 | SW 10 | SW 9 | SW 9 | SW 9 | SW 9 | — | SW 9 | SW 8 | — | — | — | SW 9 | — | — | — | — | — | — |
| kJ | 1790 | 1238 | 1137 | 1099 | 974 | 996 | — | 834 | 962 | — | — | — | 626 | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 363 | 1495 | 42 | 42 | 148 | 14 | 14 | 0 | 14 | 0 | 329 | 14 | 42 | 2 | 0 | 14 | 0 | 0 | 42 |
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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