Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 25 Jul 2026:
- Best quality surf: Thursday 30 Jul, 2PM (local time) - 3.5ft (1.0m), 9s period, SW swell with cross-offshore winds.
- Most powerful swell: Saturday 25 Jul, 8PM (local time) - 7ft (2.1m), 9s period, SW swell with 703 kJ wave energy.
- Next surfable swell (1★+): Thursday 30 Jul, 2PM (local time) - 3.5ft (1.0m), 9s 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 (Jul 30) at 2PM. The primary swell is predicted to be 1.0m and 9s period with a secondary swell of 0.2m and 9s. Another secondary swell of 0.8m and 5s 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 2.1m 9s and forecast to arrive on Saturday (Jul 25) at 8PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 4s period and expected on Sunday (Jul 26) at 2PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Thu 30th Jul) | 3.5ft (1.0m) 9s |
| Best Surf | 2PM (Thu 30th Jul) | 3.5ft (1.0m) 9s |
| Most Powerful | 8PM (Sat 25th Jul) | 7ft (2.1m) 9s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, Rusty here, and I’ve got the goods on the local surf scene for you. Let’s get into it.
Right off the bat, I gotta be straight with you: the next week and a half is looking pretty grim. We’re staring down the barrel of a long, flat, and messy stretch that’s basically a write-off. From Saturday the 25th of July all the way through to about the 3rd of August, there’s nothing worth paddling out for. The wind is either onshore, cross-onshore, or just plain ugly, and the swell is small and weak. We’re talking about a solid 10 days of junk. It’s frustrating, but it happens.
The only glimmer of hope comes right at the very end of the forecast. On Sunday the 9th of August, things finally get interesting. A big, long-period groundswell from the SSW pushes in, with a serious 12 ft of swell hitting the coast. The combined energy is massive – a whopping 3560 – this is serious, powerful stuff. The period is a very long 12 seconds, so this is proper groundswell.
Now, the catch: the wind is a howling 31 mph from the W, which is cross-offshore. That means the surface will be clean, but it’s a gale-force blow. This swell is well over 8 ft, so it’s strictly for experts. Don’t even think about it if you’re not comfortable in heavy, powerful surf. The break is Nanwan Beach (South Bay), a beach and reef setup. With such a long period, the waves will be looking for a point or reef to wrap around, so a beach break might make them a bit straight and challenging. The water temperature is sitting at 86°, which is about 2° warmer than usual for this time of year, so it’s a touch balmy but nothing crazy.
Honestly, if you’re a kite surfer, the whole second week from the 4th of August onwards might be more your scene, with all that strong wind and building swell. For us paddle surfers, the 9th of August is the only true standout, but it’s a big, dangerous beast. Keep an eye on it, because if that wind drops, it could be epic. Until then, it’s a waiting game.
Rusty.
Short Range ForecastHeavy rain (total 74mm), heaviest during Mon morning. Warm (max 28°C on Sat afternoon, min 25°C on Sun afternoon). Mainly fresh winds. | Days 5-7 Weather SummaryModerate rain (total 15mm), heaviest on Fri morning. Warm (max 29°C on Tue afternoon, min 26°C on Fri morning). Wind will be generally light. | |||||||||||||||||||
Sat 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | ||||||||||||||
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 | SW 8 | WSW 9 | W 9 | WSW 9 | SSW 7 | SSW 7 | SSW 7 | SSW 8 | SSW 8 | SSW 8 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 8 | SSW 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 943 | 433 | 340 | 176 | 132 | 169 | 157 | 134 | 142 | 254 | 184 | 145 | 152 | 193 | 152 | 152 | 206 | 155 | 105 | 120 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | cross | cross | cross-on | cross | cross | cross | cross-on | cross | cross | cross | cross | cross | off | cross-on | cross-off | cross | cross-on |
High Tide | 4:12AM1.07m | 6:57PM0.52m | 4:58AM1.12m | 7:11PM0.53m | 5:40AM1.17m | 7:28PM0.54m | 6:19AM1.20m | 7:48PM0.55m | 6:56AM1.22m | 8:10PM0.58m | 7:31AM1.20m | 8:34PM0.61m | ||||||||
Low Tide | 12:24PM0.18m | 9:09PM0.50m | 12:56PM0.14m | 10:13PM0.47m | 1:27PM0.12m | 11:04PM0.43m | 1:56PM0.12m | 11:49PM0.40m | 2:23PM0.12m | 00:31AM0.37m | 2:49PM0.14m | 1:14AM0.35m | ||||||||
 |  |  | | | | | | | |  |  | |  | | |  | | | | |
 | — | — | 5:26 | — | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — | 5:28 | — | — | 5:28 | — | — |
 | 6:39 | — | — | 6:38 | — | — | 6:38 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — |
mm | 14 | 5 | 8 | 10 | 10 | 16 | 4 | 4 | 3 | 3 | — | — | — | 1 | 6 | — | — | 5 | — | 1 |
Temp °C | 28 | 27 | 27 | 26 | 27 | 26 | 27 | 27 | 28 | 29 | 28 | 28 | 29 | 28 | 27 | 27 | 28 | 28 | 28 | 28 |
Feels °C | 29 | 29 | 28 | 28 | 28 | 26 | 29 | 28 | 28 | 30 | 29 | 29 | 31 | 32 | 29 | 30 | 31 | 32 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | SSW 9 | SW 8 | WSW 9 | W 9 | WSW 9 | SSW 7 | SSW 7 | SSW 7 | SSW 8 | SSW 8 | SSW 8 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 8 | SSW 8 |
| kJ | 943 | 433 | 340 | 176 | 132 | 169 | 157 | 134 | 142 | 254 | 184 | 145 | 152 | 193 | 152 | 152 | 206 | 155 | 105 | 120 |
Swell 2 Height (m) Direction Period (s) | ESE 9 | ENE 10 | SE 8 | SW 7 | SSW 7 | W 8 | SE 6 | W 7 | SE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | E 9 | E 9 | SE 4 | SSE 4 | ESE 9 |
| kJ | 536 | 19 | 110 | 49 | 61 | 68 | 73 | 24 | 28 | 21 | 20 | 20 | 19 | 19 | 18 | 15 | 14 | 5 | 4 | 8 |
Swell 3 Height (m) Direction Period (s) | SSE 9 | E 16 | S 7 | SE 10 | SE 10 | ENE 9 | W 8 | ESE 10 | W 6 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | E 9 | ENE 9 | ESE 9 | ESE 9 | E 9 | E 9 | E 10 |
| kJ | 165 | 5 | 23 | 25 | 28 | 16 | 43 | 40 | 7 | 8 | 7 | 7 | 7 | 15 | 8 | 8 | 8 | 14 | 14 | 8 |
Wind waves Height (m) Direction Period (s) | — | ESE 8 | ENE 10 | ESE 7 | SE 6 | SE 6 | — | ESE 6 | ESE 5 | ESE 5 | SE 5 | SE 5 | SE 6 | SE 5 | SE 5 | SE 5 | SE 5 | — | — | ESE 3 |
| kJ | — | 280 | 115 | 114 | 94 | 92 | — | 47 | 25 | 34 | 57 | 31 | 36 | 13 | 21 | 30 | 11 | — | — | 2 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 378 | 148 | 79 | 148 | 148 | 390 | 148 | 511 | 442 | 451 | 451 | 79 | 42 | 451 | 79 | 0 | 42 | 0 | 14 | 451 |
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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