Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 19 Aug 2026:
- Best quality surf: Friday 21 Aug, 8AM (local time) - 11ft (3.5m), 10s period, SW swell with cross-shore winds.
- Most powerful swell: Saturday 22 Aug, 5AM (local time) - 11ft (3.5m), 11s period, SW swell with 2,490 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 11PM (local time) - 6ft (1.9m), 9s period with SSW 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 Wednesday (Aug 19) at 11PM. The primary swell is predicted to be 1.9m 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 3.5m 11s and forecast to arrive on Saturday (Aug 22) at 5AM. 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 6s period and expected on Tuesday (Aug 25) at 11PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Wed 19th Aug) | 6ft (1.9m) 9s |
| Best Surf | 8AM (Fri 21st Aug) | 11ft (3.5m) 10s |
| Most Powerful | 5AM (Sat 22nd Aug) | 11ft (3.5m) 11s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
G’day, surfers. Rusty here, looking at the upcoming charts. It’s a mixed bag for the next fortnight, so let’s cut to the chase.
The only option on the list is Nanwan Beach (South Bay), and the water is about normal for this time of year at 85°.
The next few days are a write-off. We’ve got some moderate energy, but the wind is messy and the surf is poor. Wednesday and Thursday are not worth paddling out. By Thursday the swell builds, but it comes with stormy cross-winds, so it’s lumpy. Friday’s no good either.
There’s a real gap with no quality surf from now until the middle of next week. It’s not until the afternoon of Tuesday the 25th that things improve. That’s when the wind turns offshore and drops, and we get a clean 4ft groundswell from the east with a long 17-second period. The energy jumps (1710), and the surface turns glassy. That’s when it gets good.
Wednesday the 26th is the standout. The morning has a light offshore breeze and a solid 6ft easterly groundswell with that long period (16 seconds). The energy is strong (2007). The afternoon is the dream – the wind goes dead calm, glassy, and the surf is a beautiful, clean 6ft from the east (2101). That’s the day to be out there. It’s a beach and reef set-up, and with that long period, it might be breaking a bit straight in sections, but with the wind that light, it’ll be perfect. Crowds are often here, so get in early.
It tails off after that. Thursday the 27th and Friday the 28th have cleaner winds and smaller, but fun, south-west swell. Saturday the 29th is also worth a look with some clean 6ft surf.
The second week just looks ordinary. Onshore winds return, and the surf quality drops off. There’s some swell in early September, but it’s coming with fresh, lumpy winds. Not worth the effort.
So, your window is Tuesday through Saturday next week. Don’t miss it.
- Rusty
Short Range ForecastHeavy rain (total 138mm), heaviest during Thu morning. Warm (max 30°C on Wed morning, min 26°C on Thu morning). Winds increasing (light winds from the SW on Wed night, fresh winds from the WSW by Fri night). | Days 4-6 Weather SummaryHeavy rain (total 77mm), heaviest during Sun night. Warm (max 29°C on Mon morning, min 28°C on Sat morning). Winds decreasing (strong winds from the W on Sat night, light winds from the W by Mon night). | ||||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | |||||||||||||||
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) | SSW 8 | SSW 8 | SSW 9 | SSW 9 | SSW 10 | SSW 9 | SSW 10 | WSW 10 | SW 11 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SSW 10 | SW 10 | SW 10 | SW 10 | SW 9 | E 17 | E 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 294 | 390 | 687 | 1107 | 1338 | 1358 | 1212 | 1192 | 2424 | 2030 | 1822 | 1745 | 1676 | 1449 | 644 | 1305 | 1175 | 1199 | 891 | 998 | 1433 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | on | cross | cross | cross-off | cross | cross | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross |
High Tide | 10:51AM0.58m | 11:17PM0.93m | 12:03PM0.47m | 00:13AM0.94m | 1:28AM0.95m | 2:47AM0.98m | 3:51AM1.03m | 6:41PM0.54m | 4:42AM1.09m | 6:38PM0.56m | |||||||||||
Low Tide | 3:49PM0.42m | 7:25AM0.40m | 3:28PM0.44m | 9:52AM0.36m | 11:01AM0.29m | 11:37AM0.24m | 12:05PM0.19m | 9:07PM0.52m | 12:31PM0.16m | 10:17PM0.46m | |||||||||||
 |  |  |  | |  | | | | | | |  | | | | | | | |  | |
 | 5:35 | — | — | 5:35 | — | — | 5:35 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — |
 | — | 6:24 | — | — | 6:23 | — | — | 6:22 | — | — | 6:22 | — | — | 6:21 | — | — | 6:21 | — | — | 6:20 | — |
mm | — | — | 8 | 23 | 14 | 40 | 12 | 20 | 21 | 10 | 4 | 12 | 10 | 6 | 21 | 4 | 2 | 8 | — | 1 | 8 |
Temp °C | 30 | 29 | 28 | 27 | 27 | 27 | 28 | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 28 | 29 | 29 | 28 |
Feels °C | 32 | 30 | 33 | 29 | 28 | 30 | 29 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 29 | 31 | 32 | 31 | 33 | 32 | 32 |
Swell 1 Height (m) Direction Period (s) | SSW 8 | SSW 8 | ENE 9 | ENE 8 | SSW 10 | ENE 8 | SSW 10 | SSW 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | SSW 10 | SW 10 | ENE 10 | NE 8 | SW 9 | SW 10 | SW 10 |
| kJ | 294 | 390 | 62 | 38 | 1338 | 14 | 1212 | 913 | 10 | 10 | 20 | 10 | 10 | 19 | 627 | 1305 | 40 | 18 | 891 | 712 | 561 |
Swell 2 Height (m) Direction Period (s) | ENE 10 | E 6 | SE 9 | SE 10 | ENE 8 | — | ENE 8 | ENE 9 | NE 9 | E 14 | NE 8 | E 14 | E 14 | E 16 | ESE 10 | ENE 14 | ESE 14 | ESE 13 | ENE 12 | E 17 | E 16 |
| kJ | 37 | 41 | 3 | 14 | 26 | — | 7 | 7 | 3 | 4 | 3 | 4 | 4 | 5 | 9 | 36 | 20 | 35 | 215 | 998 | 1433 |
Swell 3 Height (m) Direction Period (s) | ESE 10 | NE 9 | SE 10 | — | — | — | — | — | — | — | — | E 14 | E 14 | — | NE 10 | ESE 9 | SE 9 | ENE 13 | E 16 | ENE 11 | NE 16 |
| kJ | 10 | 22 | 4 | — | — | — | — | — | — | — | — | 4 | 4 | — | 4 | 9 | 3 | 16 | 245 | 256 | 11 |
Wind waves Height (m) Direction Period (s) | ENE 7 | — | SSW 9 | SSW 9 | — | SSW 9 | WSW 10 | WSW 10 | SW 11 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | WSW 9 | — | SW 10 | SW 10 | — | — | ENE 9 |
| kJ | 75 | — | 687 | 1107 | — | 1358 | 962 | 1192 | 2424 | 2030 | 1822 | 1745 | 1676 | 1449 | 644 | — | 1175 | 1199 | — | — | 608 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 79 | 14 | 14 | 348 | 42 | 316 | 335 | 363 | 316 | 335 | 316 | 348 | 316 | 375 | 42 | 14 | 14 | 0 | 14 | 0 | 148 |
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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