Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 6 Aug 2026:
- Best quality surf: Sunday 9 Aug, 11AM (local time) - 13ft (4.0m), 9s period, SW swell with cross-offshore winds.
- Most powerful swell: Monday 10 Aug, 8AM (local time) - 13ft (4.0m), 10s period, SW swell with 3,490 kJ wave energy.
- Next surfable swell (1★+): Thursday 6 Aug, 2PM (local time) - 3.5ft (1.1m), 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 Thursday (Aug 06) at 2PM. The primary swell is predicted to be 1.1m 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 4.0m 10s and forecast to arrive on Monday (Aug 10) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 17s period and expected on Thursday (Aug 06) at 2PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Thu 6th Aug) | 3.5ft (1.1m) 9s |
| Best Surf | 11AM (Sun 9th Aug) | 13ft (4.0m) 9s |
| Most Powerful | 8AM (Mon 10th Aug) | 13ft (4.0m) 10s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, let’s get into it.
The next week and a half is a bit of a mixed bag. There’s swell around, but the wind is going to be a major player, and it looks like it’s going to shut things down more than once. We’ve got a stretch of poor surf starting Friday that looks like it’ll carry through the weekend and into early next week. The wind is howling from the west, and while it’s technically cross-offshore, it’s strong enough to chop things up. The swell is also getting too big for this spot, so it’s not just the wind, it’s the raw power.
The first real window we have is the morning of Saturday the 15th. The wind drops to a light breeze, and it’ll be clean. Swell is 6ft from the southwest with a period of 8 seconds. That’s a bit short, but it’s surfable. The energy is moderate at 479. Then, that afternoon looks even better. The wind goes glassy, and you’ll get 6ft of southwest swell. It’s not huge, but it’ll be clean and fun. That’s the standout day for the first week.
Looking further out, toward the end of the month, there’s a promising blip. On Friday the 21st, the morning is a bit messy with a cross-shore wind, but the afternoon is where it’s at. The wind goes light and cross-offshore, and the swell is 6ft from the southwest with a period of 11 seconds. That’s a nice, long-period groundswell, which will bring some proper shape. The energy is up at 857, which is moderate. This is a promising setup, but it’s a week and a half away, so we’ll have to see how it evolves.
Before that, there’s not much to get excited about. The surf from the 9th through the 14th is either too big, blown out, or just poor. The 9th and 10th have a swell of 13ft, which is way too big for this break, and the wind is up. The middle of the week sees the swell drop to 7ft, but the wind is still fresh, making it messy. The 13th and 14th are in that same boat – not good.
So, if you can wait, the 15th will be your best bet for a clean session. That Saturday afternoon with the glassy conditions is the one to circle. The 21st is a longer-shot standout, but it has the potential for the best waves of the window if the wind plays ball.
Remember, this is Nanwan Beach (South Bay), and the water temp is around 86°, which is pretty normal for this time of year.
Stay patient.
Rusty
Short Range ForecastLight rain (total 2mm), mostly falling on Thu night. Warm (max 30°C on Sat afternoon, min 28°C on Thu morning). Winds increasing (light winds from the W on Thu morning, near gales from the W by Sat night). | Days 4-6 Weather SummaryHeavy rain (total 25mm), heaviest during Mon morning. Warm (max 30°C on Sun morning, min 29°C on Sun afternoon). Winds decreasing (near gales from the W on Sun night, fresh winds from the WSW by Tue night). | ||||||||||||||||||||
Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | |||||||||||||||
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 9 | SSW 9 | SW 8 | SW 8 | SW 8 | WSW 6 | WSW 7 | WSW 8 | SW 8 | SW 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 213 | 151 | 96 | 57 | 60 | 393 | 913 | 1079 | 1816 | 2772 | 2723 | 3029 | 3034 | 2406 | 1914 | 1489 | 1186 | 1034 | 784 | 833 | 673 |
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-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross | cross | cross-off | cross-off | cross-off |
High Tide | 12:04PM0.58m | 00:31AM0.99m | 2:26PM0.49m | 1:43AM1.07m | 5:31PM0.49m | 2:58AM1.15m | 6:13PM0.51m | 4:05AM1.24m | 6:39PM0.52m | 5:05AM1.31m | 7:05PM0.54m | 5:59AM1.35m | 7:32PM0.57m | ||||||||
Low Tide | 5:03PM0.41m | 8:36AM0.31m | 5:28PM0.46m | 10:14AM0.20m | 6:01PM0.49m | 11:21AM0.09m | 8:02PM0.49m | 12:12PM0.02m | 9:36PM0.46m | 12:56PM-0.02m | 10:47PM0.40m | 1:35PM-0.01m | 11:46PM0.34m | ||||||||
 | |  | |  |  | | | |  | | | | | | | | | | |  | |
 | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:33 | — | — | 5:33 | — | — |
 | — | 6:34 | — | — | 6:32 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — |
mm | — | — | 1 | — | — | — | — | — | 1 | 1 | 1 | 2 | 3 | — | 6 | 3 | 3 | 6 | 3 | — | 3 |
Temp °C | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 29 |
Feels °C | 34 | 33 | 33 | 28 | 26 | 29 | 27 | 28 | 28 | 28 | 28 | 27 | 27 | 28 | 29 | 28 | 29 | 31 | 30 | 29 | 31 |
Swell 1 Height (m) Direction Period (s) | ENE 18 | ENE 17 | ENE 16 | ENE 16 | ENE 16 | ENE 15 | NE 16 | NE 15 | NE 15 | NNE 15 | NNE 14 | SE 10 | SE 10 | ENE 15 | E 14 | ENE 13 | ENE 13 | ENE 13 | SW 10 | SW 10 | SW 10 |
| kJ | 3753 | 3712 | 3178 | 2895 | 2447 | 1368 | 1200 | 1105 | 640 | 398 | 140 | 28 | 27 | 71 | 94 | 137 | 135 | 90 | 784 | 833 | 673 |
Swell 2 Height (m) Direction Period (s) | SSW 9 | SSW 9 | — | SW 8 | SW 8 | — | — | — | SE 10 | E 15 | SSE 10 | NNE 14 | ENE 15 | SE 10 | SE 10 | SE 10 | SE 9 | SE 9 | ENE 12 | ENE 12 | ENE 11 |
| kJ | 213 | 151 | — | 57 | 60 | — | — | — | 4 | 4 | 10 | 36 | 43 | 27 | 26 | 48 | 43 | 29 | 83 | 81 | 48 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | E 16 | E 11 | ENE 15 | ENE 15 | NNE 12 | N 11 | — | NE 11 | — | — | SE 9 | SE 9 | SE 8 |
| kJ | — | — | — | — | — | — | — | — | 5 | 2 | 21 | 21 | 29 | 2 | — | 5 | — | — | 20 | 19 | 17 |
Wind waves Height (m) Direction Period (s) | — | — | SW 8 | WNW 5 | WNW 6 | WSW 6 | WSW 7 | WSW 8 | SW 8 | SW 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | — | — | — |
| kJ | — | — | 96 | 105 | 194 | 393 | 913 | 1079 | 1816 | 2772 | 2723 | 3029 | 3034 | 2406 | 1914 | 1489 | 1186 | 1034 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 148 | 676 | 42 | 148 | 538 | 148 | 148 | 148 | 148 | 148 | 535 | 335 | 148 | 375 | 348 | 148 | 375 | 42 | 329 |
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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