
Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 4 Aug 2026:
- Best quality surf: Sunday 9 Aug, 8AM (local time) - 11ft (3.5m), 9s period, WSW swell with cross-offshore winds.
- Most powerful swell: Monday 10 Aug, 8AM (local time) - 11ft (3.5m), 10s period, SW swell with 2,533 kJ wave energy.
- Next surfable swell (1★+): Tuesday 4 Aug, 11AM (local time) - 4.5ft (1.3m), 16s period with E 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 Tuesday (Aug 04) at 11AM. The primary swell is predicted to be 1.3m and 16s period with a secondary swell of 0.4m and 7s. Another secondary swell of 0.9m and 6s is also forecast. 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 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 3.0m 18s period and expected on Thursday (Aug 06) at 5PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Tue 4th Aug) | 4.5ft (1.3m) 16s |
| Best Surf | 8AM (Sun 9th Aug) | 11ft (3.5m) 9s |
| Most Powerful | 8AM (Mon 10th Aug) | 11ft (3.5m) 10s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, mate, Rusty here. Let’s get straight into it. The next couple of weeks are a bit of a mixed bag, so let’s break it down day by day.
The action kicks off on Tuesday the 4th with some clean morning waves at Nanwan Beach. It’s a beach and reef setup, pretty exposed, so it picks up whatever’s around. We’re looking at chest-high waves around 4ft from the east with a long 16-second period. That’s proper groundswell energy, a solid 900 units of it. Water temp is a warm 85°, which is pretty much spot on for this time of year. Light offshore cross-off breeze from the NNE will have it glassy and clean. Crowds are often a thing here, so get in early. It’s not the biggest, but that long period makes it feel way better than the size suggests. This is a solid start.
Wednesday the 5th is where things get properly good. The swell builds to a head-high 6ft from the east with the same 17-second period, and the energy jumps way up to 2207. Morning has a light cross-off, but the arvo is pure magic: offshore from the NW, clean faces, and it’s going to be firing. This is the standout of the first week. For an intermediate surfer, this is as good as it gets. Expect some power and proper shape. If you can only surf one day, make it Wednesday.
Then we hit a flat, poor stretch. From Thursday the 6th through Saturday the 8th, the swell drops off and goes short-period, all under 9 seconds. The wind cranks up from the WNW, getting to a strong breeze by Friday and Saturday. The waves are small and crumbly, with energy barely cracking 200-900. Honestly, it’s a write-off for surfing. Saturday’s got some size pushing 8-10ft, but it’s a choppy, blown-out mess with that strong cross-off wind. This setup looks way more interesting for kite surfing than paddle surfing. Save your energy.
Sunday the 9th sees the swell get big – 12ft from the WSW – but it’s just too big for this break. It’s an expert-only zone at that size, and with 45 km/h winds, it’s not worth the risk. The energy is huge, 1886, but the wind is going to shred it. Monday the 10th is similar, with 13ft waves and a risk of thunderstorms. This is dangerous, not fun. We’re in a gap here where there’s no good surf on offer; it’s all too big, too windy, or the quality is just gone. This poor run lasts for about four days.
Things start to settle down on Tuesday the 11th, but it’s still oversized and wonky, with 10ft waves and strong winds. The quality is just not there. We’re looking at a few more days of marginal, too-big surf until we get to the second week.
Finally, we get a bit of relief on Thursday the 13th. The swell drops to a more manageable 8-8ft from the SW, and the wind finally eases off. The arvo is the pick: light westerly breeze, clean, and the energy is still pumping at 1425. The period is a solid 11 seconds. This is for experienced surfers, but it’ll be worth it. This is the second standout of the window.
Friday the 14th stays fun, with 6-7ft SW swell and light winds. Clean and consistent, good for a solid session. The weekend of the 15th and 16th brings smaller waves, back down to 5-6ft. It’s not as powerful, but it’s still rideable and clean. Good for getting out there if you don’t mind a smaller wave.
The last couple of days, the 18th and 19th, see the wind swing onshore from the SSW, making things choppy again. The swell is there, around 7ft, but the quality is poor. Not worth the paddle out.
So, to wrap it up: Wednesday the 5th is the must-surf day, no question. Then Thursday the 13th is your other solid window. Everything else is either too small, too big, or too windy. It’s a frustrating stretch in the middle, but those two days are worth waiting for.
Rusty
Short Range ForecastSome drizzle, heaviest during Thu night. Warm (max 30°C on Tue morning, min 27°C on Tue night). Winds increasing (calm on Wed night, strong winds from the WNW by Thu night). | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Sun morning. Warm (max 30°C on Sat morning, min 29°C on Fri morning). Mainly strong winds. | ||||||||||||||||||||
Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | |||||||||||||||
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) | E 16 | E 16 | E 18 | E 17 | E 17 | SW 9 | WSW 8 | WSW 8 | SW 9 | SW 8 | W 6 | WSW 7 | WSW 8 | WSW 8 | WSW 10 | WSW 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 |
Wave Graph | |||||||||||||||||||||
822 | 1106 | 1561 | 2196 | 2023 | 49 | 83 | 116 | 79 | 162 | 339 | 631 | 989 | 1431 | 1899 | 1933 | 1903 | 2083 | 2474 | 1930 | 1986 | |
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-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 9:57AM0.86m | 10:43PM0.86m | 10:48AM0.72m | 11:31PM0.93m | 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 | ||||||||
Low Tide | 4:18PM0.31m | 5:01AM0.38m | 4:40PM0.37m | 6:37AM0.37m | 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 | ||||||||
5:30 | — | — | 5:30 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | |
— | 6:35 | — | — | 6:34 | — | — | 6:34 | — | — | 6:32 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | |
mm | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | 1 | — | 2 | — | — | 3 |
Temp °C | 30 | 30 | 28 | 29 | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 29 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 |
Feels °C | 32 | 32 | 31 | 33 | 33 | 34 | 31 | 31 | 31 | 27 | 27 | 28 | 28 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | E 16 | E 16 | E 18 | E 17 | E 17 | ENE 18 | ENE 18 | ENE 18 | ENE 18 | ENE 18 | ENE 17 | NE 16 | NE 16 | NE 16 | NE 16 | NE 16 | NE 16 | NE 15 | NNE 16 | NE 15 | NNE 14 |
822 | 1106 | 1561 | 2196 | 2023 | 2318 | 4329 | 4598 | 5340 | 5555 | 4423 | 2093 | 1513 | 1675 | 1494 | 1622 | 1366 | 1046 | 801 | 523 | 133 | |
Swell 2 Height (m) Direction Period (s) | WSW 7 | SW 7 | SW 7 | SW 7 | NE 18 | SW 9 | — | — | SW 9 | SW 8 | — | — | — | — | — | SSE 10 | SSE 10 | SE 11 | SE 10 | ENE 15 | E 14 |
19 | 12 | 12 | 11 | 12 | 49 | — | — | 79 | 162 | — | — | — | — | — | 11 | 10 | 18 | 16 | 42 | 98 | |
Swell 3 Height (m) Direction Period (s) | E 8 | E 8 | SW 7 | — | — | — | — | — | — | — | — | — | — | — | — | — | E 15 | E 15 | ENE 15 | SE 10 | SE 10 |
6 | 12 | 12 | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | 17 | 22 | 15 | 16 | |
Wind waves Height (m) Direction Period (s) | E 6 | E 6 | E 6 | — | W 6 | — | WSW 8 | WSW 8 | WNW 5 | WNW 6 | W 6 | WSW 7 | WSW 8 | WSW 8 | WSW 10 | WSW 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 |
57 | 60 | 43 | — | 21 | — | 83 | 116 | 69 | 290 | 339 | 631 | 989 | 1431 | 1899 | 1933 | 1903 | 2083 | 2474 | 1930 | 1986 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 2 | 2 | 148 | 148 | 676 | 538 | 148 | 442 | 42 | 148 | 390 | 316 | 148 | 316 | 316 | 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.











