Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 10 Sep 2026:
- Best quality surf: Monday 14 Sep, 2AM (local time) - 3ft (0.9m), 8s period, SW swell with cross-offshore winds.
- Most powerful swell: Monday 14 Sep, 5AM (local time) - 2ft (0.6m), 14s period, E swell with 142 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 2AM (local time) - 3ft (0.9m), 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 Monday (Sep 14) at 2AM. The primary swell is predicted to be 0.9m 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 0.6m 14s and forecast to arrive on Monday (Sep 14) 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 2.5m 8s period and expected on Friday (Sep 11) at 8AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Mon 14th Sep) | 3ft (0.9m) 8s |
| Best Surf | 2AM (Mon 14th Sep) | 3ft (0.9m) 8s |
| Most Powerful | 5AM (Mon 14th Sep) | 2ft (0.6m) 14s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s break down what’s ahead for the next couple of weeks in this neck of the woods. I’ll be honest—it’s a slow start. The first week and a half is pretty much a bust for any decent waves, but there’s one afternoon that’s worth waiting for.
The pattern is stubborn—tiny swells and messy winds for days. From this Friday, 11 September, right through to the morning of Saturday, 19 September, it’s a long, flat gap with nothing to recommend. The waves are barely there, with combined wave energy mostly under 100 units, and the wind is cross-off or cross-shore the whole time. You’d be out there for nothing.
The one standout hits on Saturday afternoon, 19 September. Nanwan Beach (South Bay) is your spot. Swell comes in at 5ft from the east, with a very long period of 20 seconds—that’s proper groundswell with tons of energy, measuring 1623 units. The wind is light from the north-northeast at just 6 mph, cross-offshore, so it’ll be glassy. This is excellent for experienced surfers. The water temp is 84°, normal for this time of year. Just remember, that long period can make the waves break a bit straight on a beach break, so it might not be super angled. Crowds are likely, so plan for company.
After that, the surf drops off fast. Sunday, 20 September, goes flat, and the rest of the second week stays small and weak, with heights under 3ft and poor conditions until Saturday, 26 September. That afternoon brings a small pulse—3ft from the east with a 13-second period and combined energy of 210 units—but it’s only surfable, nothing special. The wind is cross-offshore from the northeast at 9 mph, so clean but ordinary.
So, save your energy for that Saturday afternoon, 19 September, at Nanwan Beach. That’s your one true highlight. Everything else is a flat, frustrating slog.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Fri night. Warm (max 29°C on Sat morning, min 27°C on Fri morning). Winds decreasing (strong winds from the NE on Fri night, light winds from the NNE by Sun night). | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Mon afternoon. Warm (max 29°C on Mon morning, min 26°C on Mon night). Mainly strong winds. | ||||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | |||||||||||||||
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 16 | E 16 | ESE 9 | SSW 8 | SSW 7 | SSW 7 | SW 8 | SW 9 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | ESE 9 | ENE 5 | ESE 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 21 | 21 | 8 | 6 | 31 | 44 | 57 | 110 | 102 | 53 | 48 | 37 | 57 | 40 | 29 | 25 | 16 | 9 | 8 | 99 | 8 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-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 | cross | cross |
High Tide | 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 | 9:45AM0.61m | 9:30PM1.02m | 10:25AM0.50m | 10:08PM1.00m | ||||||||
Low Tide | 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 | 2:28PM0.41m | 5:06AM0.32m | 2:22PM0.43m | ||||||||
 | |  |  |  |  | | | | | | | | | | | | | | | | |
 | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — |
 | — | 6:04 | — | — | 6:02 | — | — | 6:01 | — | — | 6:00 | — | — | 6:00 | — | — | 5:59 | — | — | 5:58 | — |
mm | — | — | 4 | 2 | — | — | — | — | — | — | 1 | 1 | — | 1 | — | — | 1 | — | — | — | — |
Temp °C | 28 | 28 | 28 | 29 | 29 | 28 | 29 | 29 | 27 | 29 | 29 | 28 | 29 | 29 | 27 | 28 | 28 | 27 | 28 | 29 | 28 |
Feels °C | 26 | 27 | 26 | 28 | 29 | 29 | 29 | 31 | 28 | 29 | 30 | 30 | 29 | 29 | 27 | 26 | 26 | 26 | 27 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | E 16 | E 16 | ENE 15 | ENE 15 | SSW 7 | SSW 7 | SW 8 | SW 9 | SW 8 | SW 8 | SW 8 | E 13 | SW 8 | SW 8 | E 12 | E 12 | SW 8 | ENE 15 | ENE 14 | ENE 14 | ENE 14 |
| kJ | 21 | 21 | 44 | 74 | 31 | 44 | 57 | 110 | 102 | 53 | 48 | 90 | 57 | 40 | 77 | 72 | 16 | 44 | 63 | 115 | 115 |
Swell 2 Height (m) Direction Period (s) | ESE 9 | SSW 9 | NNW 7 | SSW 8 | ENE 15 | E 14 | E 14 | E 14 | E 14 | E 14 | E 13 | SW 8 | E 13 | E 13 | SW 8 | SW 8 | ENE 15 | SW 8 | WSW 7 | ESE 9 | ESE 9 |
| kJ | 8 | 7 | 5 | 6 | 74 | 98 | 103 | 98 | 101 | 101 | 92 | 37 | 87 | 86 | 29 | 25 | 23 | 9 | 5 | 8 | 8 |
Swell 3 Height (m) Direction Period (s) | SSW 8 | ESE 9 | ESE 9 | NNW 6 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | E 10 | — | — | SW 10 | NW 5 | N 8 | NW 5 | SE 9 | ESE 9 | ESE 9 | ESE 9 | SW 7 | SW 7 |
| kJ | 6 | 8 | 8 | 3 | 10 | 10 | 9 | 9 | 16 | — | — | 23 | 1 | 1 | 1 | 3 | 8 | 8 | 8 | 2 | 2 |
Wind waves Height (m) Direction Period (s) | NE 8 | NE 8 | NE 7 | ENE 5 | ENE 5 | ENE 5 | ENE 5 | ENE 5 | NE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 5 | ENE 5 | ENE 10 |
| kJ | 805 | 805 | 514 | 75 | 61 | 59 | 74 | 80 | 118 | 110 | 232 | 242 | 170 | 191 | 184 | 191 | 270 | 175 | 105 | 99 | 242 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 643 | 476 | 316 | 511 | 449 | 316 | 451 | 451 | 0 | 451 | 348 | 348 | 535 | 511 | 348 | 676 | 676 | 316 | 676 | 676 | 316 |
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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