
Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 5 Aug 2026:
- Best quality surf: Sunday 9 Aug, 11AM (local time) - 13ft (4.0m), 9s period, WSW swell with cross-offshore winds.
- Most powerful swell: Monday 10 Aug, 5AM (local time) - 15ft (4.5m), 10s period, SW swell with 3,450 kJ wave energy.
- Next surfable swell (1★+): Wednesday 5 Aug, 2PM (local time) - 6ft (1.9m), 17s 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 Wednesday (Aug 05) at 2PM. The primary swell is predicted to be 1.9m and 17s period with a secondary swell of 0.3m and 6s. 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 4.5m 10s and forecast to arrive on Monday (Aug 10) 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 3.0m 17s period and expected on Friday (Aug 07) at 2PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Wed 5th Aug) | 6ft (1.9m) 17s |
| Best Surf | 11AM (Sun 9th Aug) | 13ft (4.0m) 9s |
| Most Powerful | 5AM (Mon 10th Aug) | 15ft (4.5m) 10s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, surfers, Rusty here. Let’s get into it. The forecast for Nanwan Beach (South Bay) is a wild ride, but we gotta be patient. The first week has some serious swell, but the wind is a total mess for most of it. The real standout is way out there.
Right off the bat, Wednesday morning, August 5th, we’ve got some real potential. The water’s a warm 85°, which is dead average for this time of year, so no surprises there. We’re looking at a solid 6ft easterly groundswell with a very long 17-second period, packing a massive 2207 energy reading. The wind is light and cross-offshore, so the setup looks clean for experienced surfers. That long period means the waves will have heaps of power and shape, but it’ll be lining up for a proper reef or point setup, not a beach break. This is a window for the crew who know what they’re doing.
The rest of the week and into the next is a write-off. Thursday the 6th drops to weak, junky swell, and from Friday the 7th all the way through the following Saturday, August 15th, it’s a tough stretch. The swell gets huge, hitting 10ft to 13ft, but the wind is howling from the west at 31 to 37 mph, making it dangerous and blown out. For a beach and reef setup, that’s more of a kite-surfing show than a paddle session. There’s a lot of energy out there (over 2700 at points), but it’s just too messy and big for this spot.
We hit a bit of a lull, but then we get a glimmer. Sunday, August 16th, the swell drops to a more manageable 6ft, the wind settles to a light breeze, and the conditions are labeled “good.” It’s still a cross-offshore wind, so it’s clean. The energy is moderate at 467, but it’s a step in the right direction.
Now, the real highlight is Thursday, August 20th. This is over two weeks out, so take it with a pinch of salt, but the models are lining up something special. We’ve got a 7ft groundswell from the south-southwest with a very long 13-second period and a massive 1821 energy reading. The wind is light and cross-offshore, making for glassy conditions. This is the one to circle on the calendar for experienced surfers. It’s a long way off, but if it holds, it’ll be the best session of the whole forecast.
So, to sum it up: the first couple of days have a narrow window for the pros, then a long, windy gap of almost two weeks, followed by a promising but distant swell on the 20th. Hang tight.
- Rusty
Short Range ForecastMostly dry. Warm (max 29°C on Wed morning, min 28°C on Wed morning). Winds increasing (calm on Wed night, near gales from the WNW by Fri night). | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Sun night. Warm (max 31°C on Sun morning, min 29°C on Sat morning). Mainly near gales. | ||||||||||||||||||||
Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | |||||||||||||||
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 17 | E 17 | SSW 9 | SSW 9 | SSW 9 | SW 8 | SW 8 | SW 8 | WSW 6 | WSW 8 | WSW 8 | WSW 9 | WSW 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 11 | SW 10 | SW 10 |
Wave Graph | |||||||||||||||||||||
2196 | 2023 | 259 | 211 | 140 | 136 | 95 | 95 | 358 | 1103 | 1324 | 2224 | 2756 | 2598 | 3042 | 2691 | 2229 | 2033 | 1862 | 1887 | 1584 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | cross-off | cross | 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 |
High Tide | 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 | 5:05AM1.31m | 7:05PM0.54m | ||||||||
Low Tide | 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 | 12:56PM-0.02m | 10:47PM0.40m | ||||||||
5:30 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:33 | — | — | |
— | 6:34 | — | — | 6:34 | — | — | 6:32 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | 1 | 2 | 2 | 2 | 5 |
Temp °C | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 30 | 31 | 31 | 30 | 30 | 30 | 30 | 30 | 30 | 29 |
Feels °C | 33 | 32 | 34 | 33 | 33 | 34 | 28 | 27 | 27 | 26 | 28 | 28 | 29 | 28 | 28 | 27 | 28 | 28 | 28 | 29 | 28 |
Swell 1 Height (m) Direction Period (s) | E 17 | E 17 | ENE 18 | ENE 18 | ENE 17 | ENE 17 | ENE 16 | ENE 17 | ENE 16 | NE 16 | NE 16 | NE 15 | NE 15 | NNE 15 | NNE 15 | NNE 14 | ENE 15 | E 14 | ENE 14 | ENE 14 | ENE 13 |
2196 | 2023 | 2581 | 3753 | 3712 | 3593 | 3721 | 4499 | 2178 | 1718 | 1685 | 993 | 860 | 592 | 283 | 120 | 42 | 100 | 105 | 110 | 98 | |
Swell 2 Height (m) Direction Period (s) | SW 7 | S 9 | SSW 9 | SSW 9 | SSW 9 | SW 8 | SW 8 | SW 8 | — | — | — | SE 10 | SSE 10 | SSE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SSE 10 | SE 10 |
11 | 39 | 259 | 211 | 140 | 136 | 95 | 95 | — | — | — | 4 | 10 | 10 | 17 | 28 | 26 | 26 | 25 | 38 | 24 | |
Swell 3 Height (m) Direction Period (s) | — | WSW 6 | — | — | — | — | — | — | — | — | — | — | E 15 | E 15 | ENE 15 | ENE 15 | NNE 14 | N 12 | N 11 | — | — |
— | 8 | — | — | — | — | — | — | — | — | — | — | 17 | 4 | 21 | 44 | 36 | 3 | 2 | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | WNW 5 | WNW 6 | WSW 6 | WSW 8 | WSW 8 | WSW 9 | WSW 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 11 | SW 10 | SW 10 |
— | — | — | — | — | — | 99 | 186 | 358 | 1103 | 1324 | 2224 | 2756 | 2598 | 3042 | 2691 | 2229 | 2033 | 1862 | 1887 | 1584 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 2 | 0 | 148 | 676 | 676 | 148 | 541 | 42 | 148 | 148 | 148 | 148 | 316 | 316 | 148 | 335 | 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.











