Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 22 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 8PM (local time) - 5ft (1.6m), 9s period, SW swell with cross-offshore winds.
- Most powerful swell: Tuesday 25 Aug, 5PM (local time) - 8ft (2.4m), 17s period, E swell with 3,393 kJ wave energy.
- Next surfable swell (1★+): Wednesday 26 Aug, 8PM (local time) - 5ft (1.6m), 9s 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 Wednesday (Aug 26) at 8PM. The primary swell is predicted to be 1.6m 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 2.4m 17s and forecast to arrive on Tuesday (Aug 25) at 5PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.4m 16s period and expected on Tuesday (Aug 25) at 11PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Wed 26th Aug) | 5ft (1.6m) 9s |
| Best Surf | 8PM (Wed 26th Aug) | 5ft (1.6m) 9s |
| Most Powerful | 5PM (Tue 25th Aug) | 8ft (2.4m) 17s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, Rusty here. Let's break down what's happening at Nanwan Beach in South Bay.
Honestly, the first week is a total washout. From Saturday, August 22nd, all the way through the end of the month, the wind is howling cross-shore, the sky's dumping rain, and the waves are a lumpy, cross-chop disaster. The swell is running 6.5 to 10 feet, but with that wind, it's just a messy, blown-out wall. The water's a warm 84.5°, which is about normal for this time of year.
There's a brief moment on Wednesday, August 26th, when the wind turns cross-off and cleans the surface up, but the swell is only 5.2 feet with weak energy. It's a cleaner look, but still not worth the paddle.
The one real standout, and the only time I'd bother, is on Saturday, September 5th. The afternoon shows light cross-off wind from the WNW, cleaning up a 4-foot swell from the SSW. The energy is still low, but it's the only window in the entire 16 days where the forecast calls for "good surf conditions." It's a long way out, so don't book the trip yet, but it's the best bet. The spot is a mix of beach and reef, so watch the tide. Crowds are common here, so you won't be alone.
After that, the first week of September sees the swell die to under 3 feet with hardly any energy. It goes flat.
So, the bottom line: only one day to even think about – September 5th. Everything else is a complete write-off. Don't waste your time.
Short Range ForecastHeavy rain (total 412mm), heaviest during Sun afternoon. Warm (max 28°C on Mon night, min 26°C on Sat afternoon). Mainly strong winds. | Days 5-7 Weather SummaryHeavy rain (total 44mm), heaviest during Wed morning. Warm (max 29°C on Thu morning, min 27°C on Tue night). Winds increasing (light winds from the W on Wed night, near gales from the WNW by Fri morning). | |||||||||||||||||||
Sat 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | ||||||||||||||
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 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | E 18 | E 17 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SSW 8 | SW 9 | WSW 7 | SW 8 | SW 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 1263 | 1017 | 846 | 815 | 745 | 698 | 834 | 654 | 2922 | 3393 | 446 | 351 | 396 | 508 | 607 | 383 | 695 | 501 | 748 | 999 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross | cross-on | cross | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 2:47AM0.98m | 3:51AM1.03m | 6:41PM0.54m | 4:42AM1.09m | 6:38PM0.56m | 5:24AM1.14m | 6:49PM0.59m | 6:02AM1.17m | 7:06PM0.64m | 6:38AM1.18m | 7:26PM0.70m | |||||||||
Low Tide | 11:37AM0.24m | 12:05PM0.19m | 9:07PM0.52m | 12:31PM0.16m | 10:17PM0.46m | 12:55PM0.14m | 11:07PM0.40m | 1:18PM0.14m | 11:51PM0.35m | 1:39PM0.15m | 00:35AM0.30m | |||||||||
 |  | | | | | | | | | | | | | | | |  |  | | |
 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — |
 | 6:22 | — | — | 6:21 | — | — | 6:21 | — | — | 6:20 | — | — | 6:19 | — | — | 6:17 | — | — | 6:16 | — |
mm | 15 | 24 | 29 | 127 | 88 | 60 | 30 | 28 | 11 | 7 | 11 | 8 | 5 | 10 | 1 | 1 | 1 | — | — | 44 |
Temp °C | 26 | 27 | 27 | 26 | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 28 | 29 | 29 | 29 |
Feels °C | 26 | 28 | 26 | 25 | 27 | 28 | 26 | 28 | 28 | 27 | 29 | 30 | 29 | 32 | 31 | 31 | 31 | 24 | 22 | 21 |
Swell 1 Height (m) Direction Period (s) | ESE 10 | ESE 10 | ESE 7 | ESE 8 | SE 8 | ESE 8 | SW 9 | SW 9 | E 18 | E 17 | ENE 16 | ENE 15 | ENE 14 | ENE 13 | NE 13 | SSW 8 | NE 13 | NE 13 | NNE 13 | NNE 11 |
| kJ | 20 | 20 | 21 | 72 | 65 | 59 | 834 | 654 | 2922 | 3393 | 2980 | 1714 | 1206 | 437 | 431 | 383 | 241 | 253 | 215 | 25 |
Swell 2 Height (m) Direction Period (s) | NE 8 | NE 9 | ESE 10 | E 14 | E 14 | E 14 | ESE 8 | E 17 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | NE 18 | E 14 | NE 13 | ENE 13 | ENE 13 | ENE 12 | ENE 12 |
| kJ | 3 | 3 | 10 | 16 | 15 | 65 | 43 | 553 | 402 | 393 | 446 | 351 | 396 | 50 | 16 | 352 | 34 | 17 | 15 | 14 |
Swell 3 Height (m) Direction Period (s) | E 10 | — | — | NE 6 | E 16 | ENE 8 | ESE 13 | NE 7 | NE 19 | ENE 7 | ENE 8 | SE 9 | SSE 9 | SE 8 | SE 11 | ENE 13 | SE 8 | E 18 | SSE 8 | NE 16 |
| kJ | 2 | — | — | 2 | 5 | 7 | 60 | 44 | 15 | 79 | 109 | 3 | 7 | 3 | 4 | 35 | 3 | 6 | 7 | 10 |
Wind waves Height (m) Direction Period (s) | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | — | — | ENE 6 | — | — | — | W 4 | SW 9 | SW 9 | W 5 | SW 9 | WSW 7 | SW 8 | SW 8 |
| kJ | 1263 | 1017 | 846 | 815 | 745 | 698 | — | — | 155 | — | — | — | 10 | 508 | 607 | 99 | 695 | 501 | 748 | 999 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 316 | 148 | 329 | 42 | 148 | 42 | 148 | 316 | 316 | 148 | 148 | 676 | 14 | 0 | 42 | 14 | 42 | 42 | 148 | 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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