Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 5 Sep 2026:
- Best quality surf: Saturday 5 Sep, 11PM (local time) - 4ft (1.2m), 8s period, SW swell with cross-offshore winds.
- Most powerful swell: Saturday 5 Sep, 11PM (local time) - 4ft (1.2m), 8s period, SW swell with 177 kJ wave energy.
- Next surfable swell (1★+): Saturday 5 Sep, 11PM (local time) - 4ft (1.2m), 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 Saturday (Sep 05) at 11PM. The primary swell is predicted to be 1.2m 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 1.2m 8s and forecast to arrive on Saturday (Sep 05) at 11PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 8s period and expected on Wednesday (Sep 09) at 11PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Sat 5th Sep) | 4ft (1.2m) 8s |
| Best Surf | 11PM (Sat 5th Sep) | 4ft (1.2m) 8s |
| Most Powerful | 11PM (Sat 5th Sep) | 4ft (1.2m) 8s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
G’day, Rusty here. Look, I’ve gotta level with you – this 16-day window for Nanwan Beach (South Bay) is a tough one. We’re looking at a long, flat spell with weak, short-period swell and mostly cross-off or cross-onshore winds. The standout moments are few and far between, and you’ll be waiting over a week for anything worth paddling out for.
The water temp is sitting at a warm 83°, which is about average for this time of year, so at least you won’t need a wetsuit.
The first real sniff of something happens on Monday, September 14. Monday morning sees a jump in swell – 6ft from the ENE, but it’s a short period of 6 seconds, so it’ll be a bit of a jumbled mess. The wind is cross-off from the NE at 25 mph, which is strong, but the moderate wave energy (266) and that short period mean it’s more of a choppy, blown-out mess than anything clean. Not exactly a standout.
Things get a little more interesting towards the end of the week. On Friday, September 18, we’ve got a 5ft swell from the SW with a period of 12 seconds – that’s proper groundswell energy. The combined energy is strong at 924. The catch? Cross-off winds from the ENE at 22 mph will keep the surface clean-ish, but that’s a lot of wind. It’s marginal, but for experienced surfers, it might be the only real option.
Then on Saturday, September 19, the swell holds at 6ft from the SW with an 11-second period, and the combined energy is 690 – still strong. The wind eases a touch to 16 mph from the NE, cross-off again. It’s the best of a rough bunch, but with clean conditions and a solid SW swell, it’s the pick of the entire forecast. Just remember, that’s over a week away, so keep an eye on it.
Honestly, the rest of the period is a write-off – tiny swell, poor conditions, and a lot of nothing. If you’re desperate, Saturday the 19th is your only real shot, but keep expectations in check. Unless you’re into kite surfing, because with that wind and messy surf, the beach setup might look more interesting for the kite crew.
Rusty.
Short Range ForecastModerate rain (total 16mm), heaviest on Mon afternoon. Warm (max 29°C on Sun afternoon, min 26°C on Mon night). Winds decreasing (fresh winds from the WNW on Sun night, calm by Tue morning). | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Tue night. Warm (max 28°C on Wed morning, min 25°C on Tue night). Winds decreasing (fresh winds from the NE on Thu morning, light winds from the NW by Fri morning). | |||||||||||||||||||
Sat 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | ||||||||||||||
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) | SW 8 | SW 8 | SW 8 | SSW 8 | SW 8 | SSW 9 | SSW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SSW 7 | SSW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 10 | SW 9 | SW 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 167 | 173 | 133 | 114 | 95 | 141 | 120 | 98 | 102 | 80 | 46 | 37 | 39 | 28 | 15 | 17 | 10 | 24 | 21 | 10 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | off | cross-off | off | cross-off | cross-off | cross-on | cross-on | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off |
High Tide | 1:23AM1.08m | 2:52AM1.13m | 6:06PM0.54m | 4:04AM1.19m | 6:11PM0.58m | 5:02AM1.23m | 6:29PM0.63m | 5:52AM1.23m | 6:50PM0.71m | 6:37AM1.19m | 7:14PM0.79m | |||||||||
Low Tide | 10:22AM0.15m | 11:16AM0.09m | 8:28PM0.52m | 11:56AM0.06m | 10:01PM0.44m | 12:30PM0.06m | 11:05PM0.36m | 12:59PM0.09m | 11:59PM0.28m | 1:24PM0.15m | 00:48AM0.23m | |||||||||
 |  |  | | |  | |  | | |  | | | |  | | | | | | |
 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — |
 | 6:09 | — | — | 6:08 | — | — | 6:07 | — | — | 6:07 | — | — | 6:06 | — | — | 6:05 | — | — | 6:04 | — |
mm | — | 8 | — | — | 2 | 1 | 5 | — | — | — | 1 | — | — | — | 1 | — | — | — | 1 | 1 |
Temp °C | 28 | 28 | 28 | 29 | 28 | 28 | 28 | 26 | 27 | 27 | 26 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 29 | 28 |
Feels °C | 28 | 31 | 30 | 29 | 33 | 32 | 32 | 27 | 32 | 30 | 27 | 28 | 27 | 26 | 26 | 27 | 27 | 31 | 33 | 26 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SW 8 | SW 8 | SSW 8 | SW 8 | SSW 9 | SSW 8 | SW 8 | SW 8 | NE 9 | SW 8 | SSW 7 | SSW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 10 | SW 9 | NW 8 |
| kJ | 167 | 173 | 133 | 114 | 95 | 141 | 120 | 98 | 102 | 101 | 46 | 37 | 39 | 28 | 15 | 17 | 10 | 24 | 20 | 15 |
Swell 2 Height (m) Direction Period (s) | NE 8 | NE 12 | NE 11 | NE 11 | NE 10 | NE 9 | WNW 5 | NE 9 | ENE 8 | SW 8 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | NW 7 | E 16 | E 16 | ENE 15 |
| kJ | 18 | 140 | 217 | 179 | 177 | 83 | 17 | 73 | 14 | 80 | 10 | 10 | 10 | 10 | 9 | 9 | 13 | 21 | 21 | 44 |
Swell 3 Height (m) Direction Period (s) | ENE 10 | ENE 10 | SE 9 | SSE 8 | SE 8 | SE 9 | ENE 9 | NW 4 | SE 8 | ESE 11 | SE 8 | SE 7 | NW 7 | E 19 | SW 10 | E 18 | ESE 10 | ESE 9 | ESE 9 | SW 8 |
| kJ | 19 | 19 | 12 | 7 | 2 | 3 | 9 | 3 | 3 | 11 | 2 | 2 | 2 | 7 | 4 | 6 | 9 | 8 | 8 | 10 |
Wind waves Height (m) Direction Period (s) | W 4 | — | WNW 5 | NW 6 | NW 5 | NW 5 | NE 9 | NE 6 | NE 9 | — | NE 9 | NE 9 | NE 5 | NE 7 | NE 7 | NE 7 | NE 7 | NE 7 | NE 6 | NE 7 |
| kJ | 17 | — | 50 | 301 | 35 | 55 | 97 | 43 | 93 | — | 194 | 132 | 61 | 623 | 397 | 522 | 589 | 230 | 233 | 589 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 42 | 14 | 42 | 0 | 42 | 0 | 0 | 0 | 2 | 406 | 348 | 996 | 494 | 449 | 451 | 494 | 2 | 2 | 42 | 442 |
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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