Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 7 Aug 2026:
- Best quality surf: Monday 10 Aug, 2AM (local time) - 11ft (3.5m), 10s period, SW swell with cross-offshore winds.
- Most powerful swell: Monday 10 Aug, 8AM (local time) - 13ft (4.0m), 10s period, SW swell with 2,791 kJ wave energy.
- Next surfable swell (1★+): Monday 10 Aug, 2AM (local time) - 11ft (3.5m), 10s 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 (Aug 10) at 2AM. The primary swell is predicted to be 3.5m and 10s period with a secondary swell of 0.4m and 10s. 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 4.0m 10s and forecast to arrive on Monday (Aug 10) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 14s period and expected on Saturday (Aug 08) at 2PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Mon 10th Aug) | 11ft (3.5m) 10s |
| Best Surf | 2AM (Mon 10th Aug) | 11ft (3.5m) 10s |
| Most Powerful | 8AM (Mon 10th Aug) | 13ft (4.0m) 10s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Howdy, Rusty here again. Look, I’m not gonna sugarcoat it – the next couple of weeks at Nanwan Beach (South Bay) are a tough pill to swallow. We’ve got plenty of swell, but the wind is just wrecking it. There’s a dry spell right off the bat: Saturday and Sunday (August 8th and 9th) are total write-offs with howling westerly winds around 28 mph kicking up the chop.
Then things get real. Come Monday the 10th, a big 12-foot southwest swell hits. The combined wave energy is cranking at 2515, which is serious power. But with the period around 9-10 seconds and that strong wind, it’s going to be too big and ugly for a fun paddle. This size, over 8 feet, is pure expert stuff and honestly, this spot might be better suited for the kite guys that day.
The middle of the week, from Tuesday the 11th through to Friday the 14th, the swell stays in the 7-to-8-foot range from the southwest, with moderate to strong energy. The wind is a constant cross-off breeze at 15 to 22 mph, but the surf quality is just marginal. The crowds are marked as ‘often’, so expect company even when it’s not great. The swell direction from the southwest isn’t the best match for this break either.
The one real beacon of hope, and the only time I’d point you to the water, is Sunday the 16th and Monday the 17th. On Sunday afternoon, the swell drops to a manageable 6 feet from the southwest, with an 9-second period and moderate energy (592). The wind lays right down to a gentle 9 mph cross-off from the west-northwest. But Monday morning is the gem – just a light 6 mph breeze on a 6-foot southwest swell. The forecast straight-up says “expect good surf conditions.” That’s the window. It’ll be clean and rideable, a proper session after all that noise.
After that, it’s a slow fade. From Tuesday the 18th onward, the swell drops under 6 feet, the wind switches to the north and northeast, and it’s all poor or marginal again through to the 23rd.
So, my advice? Sleep in this weekend. Save your energy for that Monday the 17th. That’s the one.
Rusty.
Short Range ForecastLight rain (total 8mm), mostly falling on Mon morning. Warm (max 31°C on Sun afternoon, min 29°C on Fri night). Mainly strong winds. | Days 5-7 Weather SummaryHeavy rain (total 32mm), heaviest during Mon night. Warm (max 30°C on Mon night, min 28°C on Tue night). Mainly strong winds. | ||||||||||||||||||
Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | ||||||||||||||
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) | WSW 6 | WSW 7 | WSW 7 | SW 9 | SW 9 | SW 10 | SW 10 | SW 10 | SW 9 | SW 9 | SW 10 | SW 10 | SW 10 | SW 9 | SW 10 | SW 9 | SW 9 | SW 9 | SW 9 |
Wave Graph  | |||||||||||||||||||
 kJ | 351 | 520 | 603 | 1297 | 1336 | 1742 | 1952 | 2498 | 1921 | 1836 | 1375 | 1115 | 1161 | 1015 | 876 | 840 | 828 | 987 | 1010 |
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 | cross-off | cross-off | cross-off | cross-off | cross-off | cross |
High Tide | 1:43AM1.07m | 5:31PM0.49m | 2:58AM1.15m | 6:13PM0.51m | 4:05AM1.24m | 6:39PM0.52m | 5:05AM1.31m | 7:05PM0.54m | 5:59AM1.35m | 7:32PM0.57m | 6:48AM1.35m | 7:59PM0.62m | |||||||
Low Tide | 10:14AM0.20m | 6:01PM0.49m | 11:21AM0.09m | 8:02PM0.49m | 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 | |||||||
 |  |  |  | |  |  | | |  | | | | | | | | | | |
 | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — |
 | 6:32 | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — |
mm | — | — | — | — | — | 1 | 3 | 3 | 1 | 4 | 4 | 2 | 8 | 4 | 2 | 4 | 2 | 2 | 7 |
Temp °C | 29 | 30 | 30 | 30 | 30 | 31 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 |
Feels °C | 27 | 28 | 27 | 28 | 27 | 28 | 28 | 29 | 29 | 27 | 30 | 29 | 30 | 29 | 29 | 30 | 29 | 29 | 30 |
Swell 1 Height (m) Direction Period (s) | ENE 15 | NE 14 | NE 14 | NE 14 | NE 14 | NE 14 | NE 13 | ENE 15 | ENE 15 | ENE 14 | ENE 13 | ENE 13 | ENE 12 | SW 9 | SW 10 | ENE 11 | ENE 12 | NE 11 | ENE 11 |
| kJ | 1158 | 947 | 1048 | 586 | 443 | 186 | 42 | 44 | 73 | 154 | 139 | 135 | 86 | 1015 | 876 | 50 | 52 | 31 | 22 |
Swell 2 Height (m) Direction Period (s) | — | — | — | E 16 | SSE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 9 | ENE 12 | ENE 12 | SE 8 | SE 9 | SE 8 | SSE 8 |
| kJ | — | — | — | 5 | 10 | 15 | 25 | 17 | 15 | 25 | 35 | 45 | 41 | 82 | 78 | 18 | 12 | 11 | 7 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | E 11 | ENE 15 | ENE 15 | N 11 | NE 11 | NE 11 | NE 11 | — | — | SE 9 | SE 9 | N 10 | N 9 | N 9 | N 9 |
| kJ | — | — | — | — | 9 | 21 | 42 | 2 | 5 | 5 | 4 | — | — | 20 | 19 | 2 | 2 | 2 | 1 |
Wind waves Height (m) Direction Period (s) | WSW 6 | WSW 7 | WSW 7 | SW 9 | SW 9 | SW 10 | SW 10 | SW 10 | SW 9 | SW 9 | SW 10 | SW 10 | SW 10 | — | — | SW 9 | SW 9 | SW 9 | SW 9 |
| kJ | 351 | 520 | 603 | 1297 | 1336 | 1742 | 1952 | 2498 | 1921 | 1836 | 1375 | 1115 | 1161 | — | — | 840 | 828 | 987 | 1010 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 148 | 390 | 148 | 148 | 316 | 316 | 148 | 348 | 348 | 148 | 375 | 378 | 148 | 363 | 375 | 316 | 375 | 42 | 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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