Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 11 Sep 2026:
- Most powerful swell: Saturday 19 Sep, 5AM (local time) - 4.5ft (1.3m), 5s period, ENE swell with 85 kJ wave energy.
Best Forecast Surf Conditions for Nanwan Beach (South Bay) this week:
The most powerful waves expected at Nanwan Beach (South Bay) in the next 16 days are 1.3m 5s and forecast to arrive on Saturday (Sep 19) 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 2.2m 7s period and expected on Wednesday (Sep 16) at 2PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5AM (Sat 19th Sep) | 4.5ft (1.3m) 5s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, let’s get real about Nanwan Beach (South Bay). For most of this forecast, it’s barely a puddle.
Water temp is a balmy 84°, right where it should be for this time of year. No weirdness there.
From Saturday the 12th all the way through to Saturday the 19th of September, it’s a dead zone. Swells are tiny — never over 2 ft. Winds are cross-off from the northeast, keeping it clean, but there’s no push. The combined energy is weak — between 5 and 34. Not worth waxing the board.
On Saturday the 19th, there’s a brief spike to 4 ft early in the morning but with a period of only 5 seconds — that’s short-period junk. Skip it.
Now the one real highlight: Sunday the 20th of September at dawn. Swell hits 5 ft from the east, with a massive 17-second period — that’s serious groundswell. The combined energy is a huge 1491. At a beach and reef break, that long period can make it break a bit straight, but the conditions are glassy — dead calm, southwest wind at 3 mph. That’s silky smooth. This is for experienced surfers only — over 5 ft with that power, beginners should sit this one out. The optimum direction for Nanwan is SE, and it’s coming from E, so close enough to get some clean lines.
After that, there’s a so-so day on Saturday the 26th with 4 ft from the SW, 10-second period, clean NE breeze, and moderate energy around 308-409. It’s okay, but nothing special. Crowds are common here, and with so few good days, that Sunday morning will probably be busy.
So here’s the deal: if you can paddle out on the morning of September 20th, you’ll find the only real session of the forecast. The rest is a long, flat wait.
- Rusty
Short Range ForecastLight rain (total 2mm), mostly falling on Sat morning. Warm (max 29°C on Sat morning, min 27°C on Sat night). Mainly fresh winds. | Days 4-6 Weather SummarySome drizzle, heaviest during Wed night. Warm (max 29°C on Tue morning, min 27°C on Tue night). Mainly fresh winds. | ||||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | |||||||||||||||
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) | ESE 9 | ESE 10 | SSW 7 | SSW 7 | SW 7 | SW 8 | SW 8 | SW 8 | SW 7 | SW 7 | SW 8 | WSW 7 | SW 8 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | SE 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 8 | 10 | 19 | 19 | 25 | 48 | 30 | 20 | 8 | 7 | 10 | 5 | 3 | 8 | 8 | 8 | 7 | 8 | 8 | 8 | 12 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | 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-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 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 | 12:04PM0.43m | 10:59PM0.96m | ||||||||
Low Tide | 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 | 6:41AM0.35m | |||||||||
 |  |  | | | | | | | | | | | |  | | | | | | | |
 | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — |
 | — | 6:02 | — | — | 6:01 | — | — | 6:00 | — | — | 6:00 | — | — | 5:59 | — | — | 5:58 | — | — | 5:57 | — |
mm | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — |
Temp °C | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 27 | 29 | 29 | 27 | 28 | 29 | 27 | 29 | 29 | 28 | 29 | 29 | 28 |
Feels °C | 28 | 30 | 29 | 30 | 30 | 28 | 29 | 30 | 27 | 28 | 29 | 25 | 26 | 27 | 26 | 28 | 29 | 29 | 29 | 29 | 28 |
Swell 1 Height (m) Direction Period (s) | ENE 15 | ENE 15 | SSW 7 | E 14 | SW 7 | SW 8 | E 14 | E 13 | E 13 | E 13 | E 13 | E 12 | SW 7 | ENE 16 | ENE 15 | ENE 14 | ENE 14 | ENE 14 | ENE 13 | ENE 13 | ENE 13 |
| kJ | 74 | 74 | 19 | 103 | 25 | 48 | 101 | 92 | 90 | 87 | 86 | 80 | 2 | 24 | 44 | 62 | 115 | 115 | 67 | 98 | 65 |
Swell 2 Height (m) Direction Period (s) | SSW 7 | ESE 10 | E 14 | SSW 7 | E 14 | E 14 | SW 8 | SW 8 | SW 7 | SW 7 | SW 8 | WSW 7 | NW 5 | WSW 8 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | SE 9 |
| kJ | 5 | 10 | 98 | 19 | 98 | 101 | 30 | 20 | 8 | 7 | 10 | 5 | 1 | 6 | 8 | 8 | 7 | 8 | 8 | 8 | 12 |
Swell 3 Height (m) Direction Period (s) | ESE 9 | SSW 8 | ESE 10 | ESE 10 | ESE 10 | — | NW 5 | — | NW 5 | SW 8 | NW 5 | NW 6 | SW 8 | ESE 9 | NW 8 | SE 9 | SE 9 | SE 8 | SE 9 | SE 9 | SE 9 |
| kJ | 8 | 7 | 10 | 9 | 9 | — | 1 | — | 1 | 3 | 1 | 2 | 3 | 8 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
Wind waves Height (m) Direction Period (s) | ENE 6 | NE 5 | ENE 4 | ENE 5 | ENE 5 | NE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | ENE 6 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 5 | ENE 9 | ENE 5 |
| kJ | 148 | 53 | 42 | 83 | 90 | 237 | 261 | 350 | 363 | 204 | 293 | 323 | 312 | 380 | 181 | 178 | 168 | 178 | 116 | 227 | 118 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 676 | 676 | 316 | 497 | 494 | 348 | 449 | 676 | 348 | 450 | 676 | 329 | 694 | 476 | 316 | 694 | 676 | 316 | 694 | 676 | 329 |
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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