Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 12 Aug 2026:
- Best quality surf: Sunday 16 Aug, 2PM (local time) - 7ft (2.1m), 9s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 16 Aug, 5AM (local time) - 8ft (2.5m), 9s period, SW swell with 951 kJ wave energy.
- Next surfable swell (1★+): Sunday 16 Aug, 2PM (local time) - 7ft (2.1m), 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 Sunday (Aug 16) at 2PM. The primary swell is predicted to be 2.1m 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 2.5m 9s and forecast to arrive on Sunday (Aug 16) at 5AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Wednesday (Aug 19) at 5AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Sun 16th Aug) | 7ft (2.1m) 9s |
| Best Surf | 2PM (Sun 16th Aug) | 7ft (2.1m) 9s |
| Most Powerful | 5AM (Sun 16th Aug) | 8ft (2.5m) 9s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, let's talk waves. Nanwan Beach (South Bay) isn't going to be cranking every day, but there's a couple of moments in the next couple of weeks that are worth your time. Water temp is a balmy 85°, which is right on the money for this time of year, so you can go with a shorty or a springy.
The first few days, right through Thursday, are messy. We've got a cross-off wind and a lot of storm clouds. The swell is there, in the 6 to 8ft range from the SW, but it's not organized. It's a washing machine. The energy is moderate, but the quality isn't there to get you frothing.
Friday and Saturday are ragged. The wind gets more cross, and it's a battle. Saturday afternoon the wind lightens slightly, but it's still marginal. You'd be hassling more than riding.
Sunday the 16th is a bit better. A lighter cross-off and a clean 7ft. But Monday the 17th is the one to start paying attention to. The wind goes light and cross-off in the morning, and it's clean. 7ft of SW swell. Then Monday afternoon it goes nearly glassy with a light cross-off breeze. That's the window. That's when you get a few proper ones.
Then it deserts us. From Tuesday the 18th through Friday the 21st, the swell drops to 4ft or less and the winds go onshore. Everything is chopped up. This is the dead zone. A few days of small, blown-out dribble.
The swell comes back with a vengeance on Saturday the 22nd, but it's not clean. Sunday the 23rd is the big one. The forecast is for a dead calm, glassy morning with 8ft of SW swell. The energy is strong and it's going to be powerful. This is the standout of the whole period, a proper, heavy day. It's pushing 8ft on the sets, so this is not for the faint of heart. This is for the guys who know what they're doing. It's going to be epic to watch, if nothing else.
After that, it all fades away again. Monday and Tuesday have clean conditions but small surf, then a severe gale hits on Tuesday afternoon and blows everything out. The rest of the forecast is a write-off, with onshore winds and dropping swell.
In short, hit Monday the 17th for the clean, fun waves. And mark your calendar for Sunday the 23rd – that's the big, glassy day for the experienced crew. All the best, Rusty.
Short Range ForecastHeavy rain (total 57mm), heaviest during Fri night. Warm (max 29°C on Wed afternoon, min 28°C on Wed night). Mainly fresh winds. | Days 5-7 Weather SummaryHeavy rain (total 50mm), heaviest during Sun morning. Warm (max 29°C on Mon morning, min 27°C on Sat night). Winds decreasing (fresh winds from the WSW on Sat afternoon, light winds from the SSW by Mon afternoon). | |||||||||||||||||||
Wed 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | ||||||||||||||
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 9 | SW 9 | SW 9 | SW 8 | SW 8 | SSW 8 | SSW 8 | SSW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 711 | 550 | 525 | 440 | 372 | 338 | 627 | 653 | 749 | 749 | 827 | 790 | 673 | 744 | 660 | 492 | 408 | 363 | 371 | 424 |
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 | cross | cross | cross | cross | cross | cross | cross-off | cross-off | cross | cross-off | cross-on | cross-on | cross-off | cross-off | cross-off |
High Tide | 7:32PM0.57m | 6:48AM1.35m | 7:59PM0.62m | 7:33AM1.28m | 8:26PM0.69m | 8:15AM1.17m | 8:55PM0.76m | 8:55AM1.03m | 9:26PM0.83m | 9:33AM0.87m | 9:58PM0.88m | 10:10AM0.71m | 10:34PM0.92m | |||||||
Low Tide | 11:46PM0.34m | 2:10PM0.03m | 00:41AM0.30m | 2:39PM0.10m | 1:33AM0.28m | 3:05PM0.18m | 2:26AM0.28m | 3:25PM0.26m | 3:20AM0.31m | 3:40PM0.33m | 4:21AM0.35m | 3:48PM0.38m | ||||||||
 |  | | | | | | | |  | | | |  | | | |  | | | |
 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:35 | — | — | 5:35 | — | — |
 | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:28 | — | — | 6:27 | — | — | 6:25 | — | — | 6:24 | — |
mm | 2 | 5 | 6 | 2 | 3 | 3 | 9 | 15 | 12 | 8 | 17 | 10 | 1 | 7 | 3 | 3 | 1 | — | 1 | 4 |
Temp °C | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 28 | 28 | 28 | 28 | 27 | 28 | 28 | 29 | 29 | 29 | 29 | 30 | 29 |
Feels °C | 30 | 33 | 30 | 30 | 31 | 30 | 30 | 30 | 30 | 28 | 29 | 29 | 32 | 32 | 33 | 33 | 34 | 32 | 33 | 30 |
Swell 1 Height (m) Direction Period (s) | SW 9 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | SSW 8 | ENE 10 | ENE 10 | ENE 10 | ENE 11 | SW 9 | SW 9 | ENE 10 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 |
| kJ | 711 | 78 | 69 | 46 | 41 | 40 | 627 | 19 | 10 | 10 | 23 | 790 | 673 | 42 | 660 | 492 | 408 | 363 | 371 | 424 |
Swell 2 Height (m) Direction Period (s) | ENE 12 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SW 9 | SE 11 | SE 11 | SSE 8 | ESE 10 | NE 11 | NE 11 | ESE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ESE 10 |
| kJ | 78 | 16 | 16 | 16 | 15 | 15 | 52 | 5 | 5 | 6 | 10 | 31 | 30 | 12 | 40 | 40 | 39 | 40 | 38 | 10 |
Swell 3 Height (m) Direction Period (s) | SE 8 | N 8 | NE 8 | N 8 | N 8 | NE 8 | ENE 10 | N 8 | N 8 | ESE 11 | NE 7 | ESE 10 | SSE 8 | — | ESE 11 | ESE 11 | ESE 11 | ESE 10 | ESE 10 | ESE 10 |
| kJ | 34 | 1 | 3 | 1 | 1 | 3 | 39 | 1 | 1 | 11 | 2 | 11 | 6 | — | 11 | 11 | 11 | 10 | 10 | 10 |
Wind waves Height (m) Direction Period (s) | — | SW 9 | SW 9 | SW 9 | SW 8 | SW 8 | — | SSW 8 | SSW 9 | SW 9 | SW 9 | — | — | SW 9 | — | — | NE 3 | NE 3 | NE 4 | ENE 10 |
| kJ | — | 550 | 525 | 440 | 372 | 338 | — | 653 | 749 | 749 | 827 | — | — | 744 | — | — | 1 | 5 | 7 | 168 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 329 | 14 | 14 | 14 | 42 | 329 | 42 | 378 | 348 | 639 | 348 | 14 | 14 | 14 | 14 | 0 | 0 | 42 | 42 | 0 |
Best forecast wave conditions in South Taiwan | ||||||||||||||||||||
Best forecast wave conditions in Taiwan | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Latest Updates
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Nanwan Beach (South Bay) surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest