
Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 8 Aug 2026:
- Best quality surf: Monday 10 Aug, 11AM (local time) - 11ft (3.5m), 10s period, SW swell with cross-offshore winds.
- Most powerful swell: Monday 10 Aug, 8AM (local time) - 13ft (4.0m), 10s period, SW swell with 2,931 kJ wave energy.
- Next surfable swell (1★+): Monday 10 Aug, 11AM (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 Monday (Aug 10) at 11AM. The primary swell is predicted to be 3.5m and 10s period with a secondary swell of 0.3m and 10s. 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-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 14s period and expected on Saturday (Aug 08) at 2PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Mon 10th Aug) | 11ft (3.5m) 10s |
| Best Surf | 11AM (Mon 10th Aug) | 11ft (3.5m) 10s |
| 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 folks, Rusty here. Let’s have a look at what’s shaping up for Nanwan Beach (South Bay) over the next couple of weeks.
The short story is, we’ve got a massive window of nothing much to get excited about. The first week is a write-off for anything worth paddling out for, with strong cross-off winds and messy, blown-out conditions. The real standouts are tucked away in the second week, and they’re worth waiting for.
First up, the early period. Saturday the 8th and Sunday the 9th are a total loss. You’re looking at 8ft to 10ft of messy, short-period swell (7 to 9 seconds) being hammered by strong breeze winds from the west. The combined energy is high (639 to 1575), but it’s all just churn. It’s not surfable in any meaningful way.
Monday the 10th is a bit of a tease. The swell hits 12ft from the SW, with a period around 10 seconds, and the combined energy is pumping (up to 2629). The wind is still strong, but the data says the tide and wind are favorable – however, that 12ft is just too big for this break. Only for the experts, and even then, it’s borderline.
From Tuesday the 11th through to Friday the 14th, it’s a slow grind. The swell drops back to the 5ft to 8ft range, but the wind stays fresh or moderate from the west, keeping everything in the “poor” to “marginal” category. The energy drops off, but the quality never arrives.
Now, here’s where it gets interesting. Saturday the 15th and Sunday the 16th are the real standout window. Swell holds around 7ft from the SSW, period around 9 seconds, and the combined energy is moderate (around 540 to 686). The wind drops right out. Saturday afternoon sees a gentle breeze, and Sunday morning has a light breeze, but the real gem is Sunday afternoon: glassy conditions with a light sea breeze from the SE. That’s the cleanest window of the whole run. The waves will be a bit raw but rideable, and with the water temperature sitting at 85°F, which is about average for this time of year, you’ll be comfortable.
After that, Monday the 17th and Tuesday the 18th are a bit of a mixed bag. Monday stays marginal with some cross-shore, but Tuesday morning looks promising again with glassy conditions and a 5ft swell from the SW. The energy is lower (410), but the clean face will make it fun for a longboard or a fish.
From Wednesday the 19th onwards, it’s a steady decline. The swell drops to 4ft to 5ft, winds turn more cross-off or cross, and the energy is weak. The last few days (Friday the 21st to Sunday the 23rd) are a sloppy, windy mess with fresh breezes and lumpy chop. Not worth your time.
The Verdict: If you’ve got to get wet, hold out for Sunday the 16th afternoon. That’s the one. Glassy, clean, 7ft SSW swell. It’s the best of a pretty average run. The Sunday the 16th afternoon session is the only true standout.
Rusty
Short Range ForecastHeavy rain (total 22mm), heaviest during Sun afternoon. Warm (max 30°C on Sat morning, min 28°C on Mon night). Mainly near gales. | Days 4-6 Weather SummaryModerate rain (total 19mm), heaviest on Tue morning. Warm (max 30°C on Thu afternoon, min 28°C on Tue night). Mainly fresh winds. | ||||||||||||||||||||
Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | |||||||||||||||
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) | WSW 7 | WSW 7 | SW 8 | SW 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 9 | SW 10 | SW 10 | SW 9 | SW 9 | SW 10 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SSW 9 |
Wave Graph | |||||||||||||||||||||
639 | 726 | 922 | 1556 | 1793 | 2103 | 2614 | 1872 | 1520 | 1137 | 1126 | 1162 | 931 | 891 | 697 | 503 | 654 | 549 | 450 | 399 | 430 | |
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 | cross-off | cross-off | cross | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross |
High Tide | 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 | 6:48AM1.35m | 7:59PM0.62m | 7:33AM1.28m | 8:26PM0.69m | ||||||||
Low Tide | 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 | 2:10PM0.03m | 00:41AM0.30m | 2:39PM0.10m | 1:33AM0.28m | |||||||
5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | |
— | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | |
mm | — | — | — | 1 | 2 | 7 | 3 | 2 | 7 | 3 | 3 | 6 | 2 | 1 | — | — | — | 4 | 1 | — | 9 |
Temp °C | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 29 | 29 | 30 | 29 |
Feels °C | 28 | 27 | 28 | 27 | 28 | 28 | 28 | 27 | 28 | 30 | 29 | 30 | 30 | 29 | 31 | 29 | 31 | 32 | 31 | 32 | 32 |
Swell 1 Height (m) Direction Period (s) | NE 14 | NE 14 | NE 13 | NE 14 | NNE 13 | NE 11 | ENE 15 | ENE 15 | ENE 14 | ENE 13 | ENE 13 | ENE 12 | ENE 12 | ENE 12 | ENE 11 | SW 9 | ENE 11 | NE 10 | SW 9 | SW 9 | SSW 9 |
878 | 951 | 444 | 264 | 114 | 33 | 44 | 73 | 154 | 139 | 135 | 119 | 82 | 79 | 51 | 503 | 47 | 27 | 450 | 399 | 430 | |
Swell 2 Height (m) Direction Period (s) | — | ENE 12 | E 16 | SSE 10 | SSE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 9 | SE 9 | SE 9 | SE 9 | SE 8 | ENE 11 | SE 8 | SE 8 | NE 10 | ENE 10 | ENE 9 |
— | 14 | 5 | 10 | 9 | 15 | 15 | 15 | 25 | 48 | 43 | 41 | 20 | 26 | 18 | 47 | 11 | 17 | 25 | 19 | 17 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | E 11 | ENE 15 | ENE 15 | NE 11 | NE 12 | NE 11 | NE 10 | NE 10 | — | — | N 9 | NE 10 | SE 8 | N 8 | N 8 | SE 8 | SSE 8 | SSE 8 |
— | — | — | 9 | 22 | 21 | 5 | 5 | 5 | 4 | 4 | — | — | 2 | 4 | 11 | 1 | 1 | 10 | 6 | 6 | |
Wind waves Height (m) Direction Period (s) | WSW 7 | WSW 7 | SW 8 | SW 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 9 | SW 10 | SW 10 | SW 9 | SW 9 | SW 10 | W 5 | SW 9 | SW 9 | — | — | — |
639 | 726 | 922 | 1556 | 1793 | 2103 | 2614 | 1872 | 1520 | 1137 | 1126 | 1162 | 931 | 891 | 697 | 34 | 654 | 549 | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 693 | 148 | 148 | 148 | 316 | 148 | 148 | 363 | 148 | 363 | 378 | 148 | 363 | 42 | 329 | 42 | 42 | 42 | 14 | 14 | 14 |
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.











