Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 31 Aug 2026:
- Best quality surf: Thursday 3 Sep, 2AM (local time) - 11ft (3.5m), 10s period, SW swell with cross-shore winds.
- Most powerful swell: Wednesday 2 Sep, 11AM (local time) - 16ft (5.0m), 11s period, SW swell with 5,831 kJ wave energy.
- Next surfable swell (1★+): Thursday 3 Sep, 2AM (local time) - 11ft (3.5m), 10s 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 Thursday (Sep 03) at 2AM. The primary swell is predicted to be 3.5m and 10s period. The wind is predicted to be cross-shore as the swell arrives.
The most powerful waves expected at Nanwan Beach (South Bay) in the next 16 days are 5.0m 11s and forecast to arrive on Wednesday (Sep 02) at 11AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 6s period and expected on Monday (Sep 07) at 2PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Thu 3rd Sep) | 11ft (3.5m) 10s |
| Best Surf | 2AM (Thu 3rd Sep) | 11ft (3.5m) 10s |
| Most Powerful | 11AM (Wed 2nd Sep) | 16ft (5.0m) 11s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, folks. Rusty here again. Let’s break down what’s going on at Nanwan Beach (South Bay). I gotta be honest with you, it’s a rough start. The first few days are a total loss – stormy, messy, and no real surf to speak of. We’re looking at a big gap of poor conditions from the 31st of August through the start of September.
The first hint of something surfable shows up on the afternoon of the 3rd of September. The swell is down to 7ft from the SW, with a 9-second period, and the wind goes cross-offshore. The combined energy is moderate (860), but it’s at least clean. It’s marginal, but it’s a start.
The one real standout in this whole 16-day window is the afternoon of the 4th of September. The swell drops to 5ft from the SW, with a short 8-second period. But the wind… it goes offshore from the NNW at just 6 mph. The combined energy is weak (334), but it’s going to be glassy clean. For a beach and reef setup, that offshore wind is everything. The water temp is a warm 84°, which is right on the money for this time of year. This is your best shot, but don’t expect much power. Crowds are “often” here, so it’ll be busy.
From there, it’s a slow fade into smaller and smaller surf. The 7th of September has some clean, knee-high dribble with offshore winds, but it’s tiny. By the 10th, it’s flat with glassy conditions and a combined energy of just 14. The only other spark in the second week is the afternoon of the 12th of September. We get a pulse of long-period (12 seconds) E swell at 3ft, with a combined energy of 283. It’s clean, but it’s a long-period groundswell on a beach and reef break, which can be a bit straight and hard to ride. Still, it’s the best of the second week, though it’s small and a week and a half away.
Bottom line? This is a tough stretch. The only day to mark on your calendar is the 4th of September afternoon. After that, it’s a waiting game.
Rusty, out.
Short Range ForecastHeavy rain (total 126mm), heaviest during Mon night. Warm (max 28°C on Tue afternoon, min 26°C on Mon night). Winds increasing (light winds from the SSW on Mon night, strong winds from the S by Wed morning). | Days 5-7 Weather SummaryHeavy rain (total 103mm), heaviest during Sat morning. Warm (max 28°C on Thu night, min 26°C on Sat afternoon). Winds decreasing (fresh winds from the W on Fri afternoon, light winds from the SSE by Sat afternoon). | ||||||||||||||||||
Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | ||||||||||||||
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 10 | SW 10 | SW 11 | SSW 11 | SW 10 | SW 10 | SW 9 | SW 9 | SW 8 | SSW 8 | SW 8 | SSW 7 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SW 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 2307 | 3233 | 2740 | 2548 | 5831 | 5069 | 2771 | 1596 | 1132 | 628 | 540 | 348 | 313 | 478 | 559 | 614 | 422 | 547 | 34 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross | cross | cross | cross | cross-off | cross | cross | cross | cross-on | cross-on | cross-off | off | cross-off |
High Tide | 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 | 1:23AM1.08m | 2:52AM1.13m | ||||||||
Low Tide | 2:55AM0.24m | 2:56PM0.32m | 3:54AM0.26m | 3:13PM0.37m | 5:07AM0.28m | 3:26PM0.41m | 6:49AM0.28m | 3:21PM0.44m | 8:56AM0.23m | 10:22AM0.15m | |||||||||
 |  | | |  | | | | | | |  | | | | |  | |  | |
 | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — |
 | 6:14 | — | 6:13 | — | — | 6:12 | — | — | 6:12 | — | — | 6:10 | — | — | 6:09 | — | — | 6:08 | — |
mm | 65 | 14 | 8 | 9 | 7 | 8 | 9 | 2 | 4 | 1 | 2 | — | 19 | 22 | 16 | 15 | 18 | 10 | 3 |
Temp °C | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 26 | 26 | 26 | 26 | 27 |
Feels °C | 26 | 25 | 28 | 29 | 28 | 27 | 28 | 29 | 29 | 31 | 30 | 28 | 31 | 28 | 31 | 30 | 29 | 29 | 31 |
Swell 1 Height (m) Direction Period (s) | ENE 11 | E 11 | E 10 | ENE 9 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | SW 9 | ENE 11 | SW 8 | SSW 8 | SW 8 | NE 8 | NE 8 | SSW 8 | SSW 8 | SSW 8 | ENE 6 |
| kJ | 43 | 57 | 48 | 26 | 78 | 80 | 77 | 69 | 1132 | 138 | 540 | 348 | 313 | 24 | 17 | 614 | 422 | 547 | 126 |
Swell 2 Height (m) Direction Period (s) | — | — | ENE 11 | ENE 11 | E 15 | E 15 | ENE 13 | E 12 | ENE 10 | NW 6 | ENE 10 | WNW 6 | ENE 10 | ENE 10 | ENE 10 | NE 8 | NNE 10 | — | SW 8 |
| kJ | — | — | 24 | 37 | 4 | 4 | 18 | 11 | 74 | 8 | 121 | 28 | 55 | 33 | 19 | 33 | 63 | — | 34 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | E 12 | SSE 8 | SSE 9 | ENE 10 | SE 9 | SE 9 | SE 9 | ENE 10 | ENE 10 | — | NW 6 |
| kJ | — | — | — | — | — | — | — | — | 11 | 7 | 8 | 58 | 12 | 3 | 3 | 32 | 19 | — | 18 |
Wind waves Height (m) Direction Period (s) | SW 10 | SW 10 | SW 10 | SW 10 | SW 11 | SSW 11 | SW 10 | SW 10 | — | SW 9 | — | — | — | SSW 7 | SSW 8 | — | — | NE 5 | NE 6 |
| kJ | 2307 | 3233 | 2740 | 2548 | 5831 | 5069 | 2771 | 1596 | — | 628 | — | — | — | 478 | 559 | — | — | 166 | 213 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 42 | 390 | 148 | 148 | 148 | 329 | 329 | 148 | 390 | 148 | 14 | 14 | 0 | 0 | 79 | 843 | 511 | 42 | 42 |
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)
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