Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 10 Aug 2026:
- Best quality surf: Sunday 16 Aug, 8AM (local time) - 7ft (2.1m), 9s period, SW swell with cross-offshore winds.
- Most powerful swell: Monday 10 Aug, 5PM (local time) - 10ft (3.0m), 10s period, SW swell with 1,782 kJ wave energy.
- Next surfable swell (1★+): Sunday 16 Aug, 8AM (local time) - 7ft (2.1m), 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 Sunday (Aug 16) at 8AM. The primary swell is predicted to be 2.1m and 9s period with a secondary swell of 0.2m and 8s. 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 3.0m 10s and forecast to arrive on Monday (Aug 10) 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 0.7m 14s period and expected on Tuesday (Aug 11) at 2AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Sun 16th Aug) | 7ft (2.1m) 9s |
| Best Surf | 8AM (Sun 16th Aug) | 7ft (2.1m) 9s |
| Most Powerful | 5PM (Mon 10th Aug) | 10ft (3.0m) 10s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
G’day, I’m Rusty.
Let’s cut to it – the first week around Nanwan Beach (South Bay) is basically a write-off. From Monday the 10th through Saturday the 15th, we’ve got a long stretch of poor to marginal conditions – strong cross-shore winds, lumpy chop, and no real reason to get wet. That’s nearly a full week of no good surf. But finally, on Sunday the 16th, things flip.
The standout is Sunday the 16th, both morning and afternoon. The wind drops to a light breeze from the WNW at about 6 mph, giving you clean cross-offshore conditions. Swell is 7 to 7 ft from the SW with a period of 9 seconds, and the combined swell energy is 688 (moderate). This beach and reef setup likes swell from the SE, so this SW pulse will work OK, especially with the cleaner conditions. Expect a fun, intermediate-sized wave. Crowds are “often” here, so you won’t be alone. For the intermediate surfer, this is the best window by far.
After that, Monday the 17th afternoon turns glassy with a light 3 mph wind from the S, and 7 ft of SSW swell – real clean. Tuesday the 18th morning is also glassy, lighter at 6 ft from the SW. Water temp is about 85°F, which is normal for this time of year, no big anomaly.
Looking further out, Monday the 24th and Tuesday the 25th bring a big jump – 3.5m (12 ft) swell from the SSW with an 11-second period and energy over 3000. That’s too big for this spot for most, and the wind is onshore to cross-on – so expert-only and pretty bumpy.
Your best bet is Sunday the 16th – get on it.
Rusty
Short Range ForecastHeavy rain (total 40mm), heaviest during Mon morning. Warm (max 30°C on Mon afternoon, min 28°C on Mon night). Mainly strong winds. | Days 4-6 Weather SummaryHeavy rain (total 39mm), heaviest during Sat night. Warm (max 29°C on Thu morning, min 28°C on Thu night). Mainly fresh winds. | ||||||||||||||||||||
Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | |||||||||||||||
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 9 | SW 10 | SW 9 | SW 9 | SW 9 | SW 10 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SSW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1825 | 1782 | 1228 | 842 | 760 | 815 | 690 | 640 | 589 | 567 | 585 | 537 | 586 | 623 | 649 | 673 | 635 | 703 | 673 | 649 | 743 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross | cross-off | cross-off | glassy |
High Tide | 6:39PM0.52m | 5:05AM1.31m | 7:05PM0.54m | 5:59AM1.35m | 7:32PM0.57m | 6:48AM1.35m | 7:59PM0.62m | 7:33AM1.28m | 8:26PM0.69m | 8:15AM1.17m | 8:55PM0.76m | 8:55AM1.03m | 9:26PM0.83m | ||||||||
Low Tide | 12:12PM0.02m | 9:36PM0.46m | 12:56PM-0.02m | 10:47PM0.40m | 1:35PM-0.01m | 11:46PM0.34m | 2:10PM0.03m | 00:41AM0.30m | 2:39PM0.10m | 1:33AM0.28m | 3:05PM0.18m | 2:26AM0.28m | 3:25PM0.26m | 3:20AM0.31m | |||||||
 | |  | | | | | | | |  | | | | | | | | | | | |
 | 5:31 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — |
 | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:28 | — | — | 6:27 | — |
mm | 5 | 6 | 10 | 4 | 3 | 7 | 2 | 1 | 2 | 3 | — | 3 | 4 | 3 | 3 | 3 | 4 | 16 | 11 | 4 | 3 |
Temp °C | 29 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 29 |
Feels °C | 28 | 30 | 30 | 30 | 30 | 31 | 29 | 29 | 31 | 29 | 30 | 31 | 30 | 29 | 32 | 30 | 30 | 31 | 32 | 32 | 34 |
Swell 1 Height (m) Direction Period (s) | ENE 15 | ENE 15 | ENE 14 | ENE 13 | ENE 13 | ENE 12 | SW 9 | SW 9 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | SW 9 | SSW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | ENE 11 |
| kJ | 73 | 123 | 201 | 181 | 178 | 155 | 690 | 640 | 78 | 47 | 46 | 41 | 586 | 623 | 649 | 673 | 635 | 703 | 673 | 649 | 46 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 9 | SE 10 | SE 9 | SE 9 | ENE 12 | ENE 12 | SE 8 | SE 9 | SE 8 | SE 8 | NE 10 | NE 10 | ENE 10 | ENE 10 | SSE 8 | ENE 11 | NE 11 | NE 11 | ESE 11 |
| kJ | 25 | 23 | 23 | 46 | 41 | 36 | 113 | 78 | 16 | 19 | 18 | 10 | 26 | 25 | 20 | 10 | 6 | 23 | 32 | 31 | 12 |
Swell 3 Height (m) Direction Period (s) | NNE 10 | NE 11 | NE 11 | N 10 | N 10 | — | SE 8 | SE 8 | NE 9 | N 8 | N 8 | N 8 | SSE 9 | SSE 8 | SSE 8 | SSE 8 | ENE 10 | SSE 8 | SE 10 | SE 8 | — |
| kJ | 10 | 5 | 4 | 2 | 2 | — | 35 | 25 | 3 | 1 | 1 | 1 | 7 | 7 | 6 | 7 | 10 | 6 | 15 | 16 | — |
Wind waves Height (m) Direction Period (s) | SW 9 | SW 10 | SW 9 | SW 9 | SW 9 | SW 10 | — | — | SW 9 | SW 9 | SW 9 | SW 9 | — | — | — | — | — | — | — | — | SW 9 |
| kJ | 1825 | 1782 | 1228 | 842 | 760 | 815 | — | — | 589 | 567 | 585 | 537 | — | — | — | — | — | — | — | — | 743 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 148 | 148 | 148 | 375 | 335 | 148 | 42 | 42 | 316 | 335 | 316 | 316 | 375 | 42 | 348 | 42 | 42 | 14 | 0 | 0 | 0 |
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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