Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 9 Sep 2026:
- Best quality surf: Sunday 13 Sep, 5PM (local time) - 4.5ft (1.4m), 9s period, SSW swell with cross-offshore winds.
- Most powerful swell: Tuesday 15 Sep, 2AM (local time) - 5ft (1.6m), 12s period, SW swell with 711 kJ wave energy.
- Next surfable swell (1★+): Sunday 13 Sep, 5PM (local time) - 4.5ft (1.4m), 9s period with SSW 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 Sunday (Sep 13) at 5PM. The primary swell is predicted to be 1.4m and 9s 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 1.6m 12s and forecast to arrive on Tuesday (Sep 15) at 2AM. 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 7s period and expected on Thursday (Sep 10) at 8PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Sun 13th Sep) | 4.5ft (1.4m) 9s |
| Best Surf | 5PM (Sun 13th Sep) | 4.5ft (1.4m) 9s |
| Most Powerful | 2AM (Tue 15th Sep) | 5ft (1.6m) 12s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s headed our way for the next couple of weeks.
Honestly, the first week is a bit of a write-off. We’ve got a long stretch of poor surf conditions from now until the 18th of September. The wind is stuck in a cross-off or cross pattern, and the swell is tiny and weak. You’ll see a few pulses of energy around 4ft to 5ft on the 13th and 15th, but the wind just isn’t playing ball, and the quality is poor. The combined energy is pretty weak, hitting only 249 on the 13th morning, so it’s not worth paddling out for.
The real standout arrives on Sunday the 21st of September. This is where it gets interesting. We’ve got a solid 7ft to 8ft easterly swell rolling in, with a very long period of 14 to 15 seconds. That’s proper groundswell, and it’s bringing a ton of energy with it – the combined energy is a massive 1724 on the Monday morning, then jumps to 3071 by the afternoon. The wind goes glassy, with a slight air in the morning and a glassy afternoon. This is excellent surf for experienced surfers only. The water is sitting at a warm 84°F, which is pretty much normal for this time of year.
If you’re an expert, the best on offer is Nanwan Beach (South Bay) on Monday the 21st and Tuesday the 22nd of September. The swell is from the east, which is a good direction for this spot. On Tuesday the 22nd, it gets even bigger, hitting 10ft with a 15-second period, and the combined energy skyrockets to 4259. The wind goes offshore from the NNW, which will make for some absolutely clean, lined-up waves. This is a serious session, but it’s not for the faint-hearted. The spot is fairly consistent, but crowds are often a thing here, so get in early.
After that, the surf drops off a cliff. The 23rd and 24th of September see no swell at all, so you’ll be sitting on the beach wondering what happened.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Fri night. Warm (max 28°C on Wed morning, min 26°C on Wed night). Mainly strong winds. | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Sat morning. Warm (max 29°C on Sat afternoon, min 27°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | |||||||||||||||
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) | SW 7 | SSW 8 | SW 8 | SW 7 | SW 8 | SW 8 | E 16 | E 16 | SSW 8 | SSW 9 | SSW 8 | SSW 8 | SSW 9 | SSW 9 | SW 9 | SW 9 | SW 10 | SW 12 | SW 11 | SW 11 | SW 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 44 | 39 | 28 | 14 | 14 | 9 | 21 | 21 | 6 | 32 | 78 | 103 | 244 | 313 | 237 | 197 | 428 | 711 | 638 | 548 | 558 |
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 | cross | cross | cross-off | cross-off | cross-off | cross-off | glassy | cross-off | cross-off | cross-off | cross-off |
High Tide | 6:29PM0.63m | 5:52AM1.23m | 6:50PM0.71m | 6:37AM1.19m | 7:14PM0.79m | 7:18AM1.10m | 7:38PM0.87m | 7:56AM0.99m | 8:04PM0.95m | 8:33AM0.86m | 8:31PM1.00m | 9:09AM0.73m | 8:59PM1.02m | ||||||||
Low Tide | 12:30PM0.06m | 11:05PM0.36m | 12:59PM0.09m | 11:59PM0.28m | 1:24PM0.15m | 00:48AM0.23m | 1:45PM0.21m | 1:36AM0.20m | 2:02PM0.28m | 2:23AM0.20m | 2:15PM0.33m | 3:11AM0.23m | 2:24PM0.38m | 4:03AM0.27m | |||||||
 | |  | | |  |  | |  |  | | | | | | | | | | | | |
 | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — |
 | — | 6:06 | — | — | 6:05 | — | — | 6:04 | — | — | 6:02 | — | — | 6:01 | — | — | 6:00 | — | — | 6:00 | — |
mm | — | — | — | — | — | — | — | — | 2 | 3 | — | 2 | — | — | — | 1 | 1 | 2 | — | — | — |
Temp °C | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 29 | 28 | 29 | 29 | 27 | 29 | 28 | 28 | 29 | 29 | 27 |
Feels °C | 27 | 27 | 26 | 26 | 28 | 24 | 26 | 27 | 28 | 28 | 29 | 29 | 30 | 30 | 29 | 33 | 32 | 31 | 29 | 30 | 28 |
Swell 1 Height (m) Direction Period (s) | SW 7 | SSW 8 | SW 8 | SW 7 | SW 8 | SW 8 | SSW 9 | SW 8 | ENE 15 | SSW 9 | SSW 8 | SSW 8 | SSW 9 | SSW 9 | SW 9 | SW 9 | SW 10 | SW 12 | SW 11 | SW 11 | SW 11 |
| kJ | 44 | 39 | 28 | 14 | 14 | 9 | 8 | 11 | 44 | 32 | 78 | 103 | 244 | 313 | 237 | 197 | 428 | 711 | 638 | 548 | 558 |
Swell 2 Height (m) Direction Period (s) | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 9 | ESE 9 | NW 8 | ENE 15 | ENE 15 | E 14 | E 14 | E 14 | E 14 | SW 11 | E 13 | E 13 | E 13 | E 13 | ENE 13 |
| kJ | 10 | 10 | 10 | 9 | 9 | 9 | 8 | 8 | 15 | 74 | 74 | 100 | 103 | 98 | 101 | 79 | 92 | 90 | 87 | 87 | 58 |
Swell 3 Height (m) Direction Period (s) | SE 7 | E 12 | E 19 | E 18 | E 18 | NNW 7 | E 16 | E 16 | SSW 8 | ESE 10 | ESE 10 | SSE 8 | SSE 7 | SSE 7 | E 10 | E 14 | E 9 | E 13 | E 13 | E 13 | E 12 |
| kJ | 2 | 3 | 7 | 6 | 6 | 5 | 21 | 21 | 6 | 9 | 10 | 6 | 5 | 4 | 16 | 142 | 25 | 128 | 87 | 87 | 108 |
Wind waves Height (m) Direction Period (s) | NE 5 | NE 5 | NE 6 | NE 6 | NE 7 | NE 7 | NE 7 | NE 7 | NE 7 | NE 6 | ENE 5 | ENE 4 | ENE 5 | ENE 7 | ENE 5 | ENE 6 | ENE 6 | ENE 8 | ENE 9 | ENE 9 | ENE 9 |
| kJ | 83 | 87 | 228 | 255 | 526 | 623 | 466 | 415 | 410 | 159 | 90 | 38 | 61 | 102 | 71 | 62 | 57 | 128 | 140 | 193 | 232 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 451 | 494 | 348 | 451 | 450 | 449 | 451 | 572 | 316 | 476 | 476 | 316 | 451 | 0 | 0 | 0 | 0 | 348 | 451 | 451 | 2 |
Best forecast wave conditions in South Taiwan | |||||||||||||||||||||
Best forecast wave conditions in Taiwan | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Nanwan Beach (South Bay) surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest