Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 3 Sep 2026:
- Best quality surf: Friday 4 Sep, 8PM (local time) - 6ft (1.8m), 8s period, SW swell with cross-offshore winds.
- Most powerful swell: Thursday 3 Sep, 11PM (local time) - 8ft (2.5m), 9s period, SW swell with 1,175 kJ wave energy.
- Next surfable swell (1★+): Friday 4 Sep, 8PM (local time) - 6ft (1.8m), 8s 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 Friday (Sep 04) at 8PM. The primary swell is predicted to be 1.8m and 8s 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 2.5m 9s and forecast to arrive on Thursday (Sep 03) at 11PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 7s period and expected on Thursday (Sep 10) at 2PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Fri 4th Sep) | 6ft (1.8m) 8s |
| Best Surf | 8PM (Fri 4th Sep) | 6ft (1.8m) 8s |
| Most Powerful | 11PM (Thu 3rd Sep) | 8ft (2.5m) 9s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's get into it for Nanwan Beach (South Bay).
Right off the bat, I gotta be straight with you – the next 16 days look like a write-off for any decent surf. We're looking at a long stretch of poor to marginal conditions, with no standout windows.
The story starts out with a bit of swell on the 3rd of September, with waves pushing 10 feet out of the SW, but it's a mess. That energy is strong, but the wind is a fresh cross-shore from the SW at 19 mph, turning it into lumpy chop. It's a "risk tstorm" day, too, so it's not exactly inviting.
Things drop off fast. From the 4th right through to the 7th, the swell steadily fades and the wave comments are all "poor surf conditions." The water temp is 84°, which is pretty much normal for this time of year. By the 8th, we're down to piddly little 2 to 3 foot waves, and while the wind goes glassy on Tuesday afternoon, there's just no swell to work with.
From the 9th of September onward, it's a total drought. Swell heights barely touch 2 feet, the combined energy numbers drop to a weak 37 or so, and we see a really long stretch of clean but completely flat conditions. Even a 16-second period pulse shows up on the 11th, but at less than a foot, it's not even a ripple.
Towards the end of the window, around the 15th and 16th, there's a little bump in the numbers – energy climbing back up – but the winds are onshore or cross-onshore, and the wave comment is still "poor surf conditions." For a beach and reef setup like Nanwan, that light onshore wind just kills any chance of a clean wave.
Honestly, there isn't a single day I'd recommend paddling out. The forecast might change, but right now, it's a two-week holiday for your surfboard. No standouts here at all.
- Rusty
Short Range ForecastHeavy rain (total 27mm), heaviest during Thu night. Warm (max 29°C on Sun morning, min 27°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Mon afternoon. Warm (max 29°C on Mon afternoon, min 25°C on Tue night). Wind will be generally light. | ||||||||||||||||||
Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | ||||||||||||||
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) | SW 9 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 7 | SW 8 | SSW 8 | SSW 8 | SSW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SSW 8 | SW 8 | SW 7 |
Wave Graph  | |||||||||||||||||||
 kJ | 971 | 567 | 519 | 314 | 296 | 277 | 284 | 269 | 191 | 109 | 82 | 84 | 100 | 95 | 67 | 46 | 37 | 28 | 19 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | cross | cross-off | cross-off | cross-on | cross-off | cross-off | cross-off | off | cross-off | glassy | glassy | cross | cross-off | cross | cross | cross-off |
High Tide | 10:45PM1.05m | 12:37PM0.46m | 11:53PM1.06m | 1:23AM1.08m | 2:52AM1.13m | 6:06PM0.54m | 4:04AM1.19m | 6:11PM0.58m | 5:02AM1.23m | 6:29PM0.63m | |||||||||
Low Tide | 6:49AM0.28m | 3:21PM0.44m | 8:56AM0.23m | 10:22AM0.15m | 11:16AM0.09m | 8:28PM0.52m | 11:56AM0.06m | 10:01PM0.44m | 12:30PM0.06m | 11:05PM0.36m | |||||||||
 |  | | | |  | | | |  |  |  | | | | | | | | |
 | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — |
 | 6:12 | — | 6:10 | — | — | 6:09 | — | — | 6:08 | — | — | 6:07 | — | — | 6:07 | — | — | 6:06 | — |
mm | 13 | 1 | 1 | 3 | 1 | — | 8 | — | — | — | — | 1 | 2 | — | — | — | — | 1 | — |
Temp °C | 27 | 28 | 28 | 28 | 28 | 28 | 27 | 29 | 29 | 27 | 28 | 29 | 27 | 28 | 28 | 27 | 27 | 28 | 27 |
Feels °C | 29 | 30 | 30 | 32 | 30 | 29 | 31 | 31 | 32 | 30 | 29 | 32 | 30 | 33 | 31 | 28 | 30 | 30 | 27 |
Swell 1 Height (m) Direction Period (s) | ENE 11 | SW 8 | SW 8 | ENE 10 | NE 9 | SW 8 | SW 8 | SW 7 | SW 8 | NE 10 | NE 9 | SSW 8 | SW 8 | SW 8 | SW 8 | SW 8 | NE 8 | SW 8 | SW 7 |
| kJ | 167 | 567 | 428 | 65 | 28 | 277 | 210 | 269 | 191 | 241 | 119 | 84 | 100 | 95 | 67 | 46 | 86 | 28 | 19 |
Swell 2 Height (m) Direction Period (s) | SE 10 | ENE 11 | ENE 11 | SE 9 | ENE 10 | NE 9 | NE 10 | NE 11 | NE 10 | SSW 8 | SSW 8 | NE 9 | NW 5 | NE 8 | NE 9 | NE 11 | SSW 8 | ESE 10 | ESE 10 |
| kJ | 4 | 128 | 99 | 12 | 19 | 19 | 122 | 191 | 117 | 109 | 82 | 95 | 6 | 69 | 51 | 19 | 37 | 10 | 10 |
Swell 3 Height (m) Direction Period (s) | — | SE 9 | SE 9 | E 13 | SE 9 | SE 8 | SE 8 | SE 8 | NW 5 | NW 6 | SE 9 | NW 5 | SE 8 | ENE 9 | ENE 9 | ESE 10 | ESE 10 | NE 12 | E 19 |
| kJ | — | 13 | 12 | 3 | 12 | 11 | 9 | 2 | 14 | 20 | 3 | 11 | 3 | 8 | 7 | 10 | 10 | 6 | 7 |
Wind waves Height (m) Direction Period (s) | SW 9 | — | SW 8 | SW 8 | SW 8 | — | SW 8 | — | — | — | NW 5 | — | NE 8 | — | — | NE 9 | NE 8 | NE 5 | NE 7 |
| kJ | 971 | — | 519 | 314 | 296 | — | 284 | — | — | — | 19 | — | 100 | — | — | 107 | 176 | 77 | 267 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 14 | 14 | 42 | 14 | 42 | 14 | 14 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 406 | 79 | 42 | 451 | 494 |
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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