Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 10 Jul 2026:
- Most powerful swell: Sunday 12 Jul, 2AM (local time) - 13ft (4.0m), 9s period, SW swell with 2,356 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 4.0m 9s and forecast to arrive on Sunday (Jul 12) at 2AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 4.5m 15s period and expected on Saturday (Jul 11) at 2AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Sun 12th Jul) | 13ft (4.0m) 9s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
Alright, Rusty here again. Let’s chat about Nanwan Beach (South Bay) in feet, mph, and Fahrenheit.
Honestly, the start of this run is a tough pill to swallow. From now until the 19th of July, the wind is just relentless – we’re talking 20 to 45 mph winds from the west and southwest, all cross or cross-on, tearing the ocean apart. You’ve got surf heights from 6 ft to over 10 ft, and the combined wave energy is pumping into the thousands, but it’s all lumpy, choppy junk. Storm risk is high. It’s not surfable.
There’s a glimmer on the 19th of July afternoon with a 16 ft SSW swell (11-second period) and the wind turning cross-off from the ENE – it would be clean. But that’s way too big for this beach-and-reef setup. Only for the hardcore.
The real standout is Tuesday morning, the 21st of July. The swell drops to a clean 8 ft from the SSW, still with a nice 11-second interval (groundswell), and the energy is solid (1896). The wind is light from the N at just 6 mph, cross-off – that’s glassy, clean conditions. For this spot, that’s pure gold. The size is right for intermediate surfers, and the wind will give you smooth faces. Water temp is nothing unusual for the time of year. Expect crowds here because it’s a known spot, but on a Tuesday morning you might have a window.
After that, the 22nd of July morning has a smaller 6 ft SSW swell with clean, light cross-off wind, but it’s only marginal. Then we’re back into a gale-force mess from the 23rd onward, with another huge swell event around the 25th that’s too big for the break.
In short, the first week and a half is a wash. The only serious window is Tuesday morning, the 21st of July. That’s your best bet.
Rusty.
Short Range ForecastHeavy rain (total 68mm), heaviest during Mon morning. Warm (max 30°C on Sat afternoon, min 28°C on Fri night). Mainly severe gales. | Days 5-7 Weather SummaryHeavy rain (total 119mm), heaviest during Mon night. Warm (max 29°C on Tue morning, min 28°C on Mon night). Mainly fresh winds. | ||||||||||||||||||||
Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Fri 17 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | ENE 15 | ENE 14 | WSW 8 | SW 9 | SW 9 | SW 9 | SW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SW 9 | SW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SW 9 | SW 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 1883 | 2356 | 1379 | 1059 | 1057 | 845 | 800 | 820 | 601 | 847 | 1109 | 885 | 1165 | 1037 | 749 | 911 | 699 | 525 | 471 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross | cross-on | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross-on | cross-on | cross-on | on | cross-on |
High Tide | 3:17AM1.13m | 5:27PM0.54m | 4:13AM1.24m | 6:34PM0.53m | 5:08AM1.34m | 7:23PM0.52m | 6:01AM1.40m | 8:03PM0.52m | 6:53AM1.42m | 8:40PM0.52m | 7:43AM1.39m | 9:15PM0.55m | 8:31AM1.30m | ||||||||
Low Tide | 11:11AM0.13m | 8:45PM0.46m | 12:10PM0.02m | 9:41PM0.45m | 1:03PM-0.05m | 10:38PM0.43m | 1:53PM-0.07m | 11:34PM0.39m | 2:39PM-0.05m | 00:28AM0.36m | 3:21PM0.01m | 1:23AM0.35m | 3:58PM0.09m | ||||||||
 |  | |  | | | | | | | | | | | | | | | | | | |
 | — | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — | 5:22 | — | — | 5:22 | — | — | 5:22 | — |
 | 6:44 | — | 6:44 | — | — | 6:43 | — | — | 6:43 | — | — | 6:43 | — | — | 6:43 | — | — | 6:43 | — | — | 6:42 |
mm | — | 4 | 6 | 7 | 4 | 6 | 16 | 12 | 13 | 21 | 9 | 9 | 23 | 10 | 11 | 22 | 11 | 3 | 10 | 4 | 3 |
Temp °C | 29 | 29 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 |
Feels °C | 33 | 21 | 26 | 27 | 29 | 29 | 31 | 32 | 31 | 32 | 32 | 32 | 30 | 31 | 31 | 31 | 32 | 32 | 30 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | ENE 15 | ENE 14 | NE 13 | NE 12 | SE 11 | SE 10 | SE 10 | SE 9 | SSW 9 | E 7 | SSW 9 | E 9 | SE 8 | SE 7 | SE 8 | E 10 | E 9 | E 10 | ESE 10 | SW 9 | SW 9 |
| kJ | 8444 | 3008 | 1367 | 207 | 163 | 200 | 154 | 86 | 800 | 8 | 601 | 7 | 39 | 24 | 20 | 17 | 16 | 19 | 20 | 525 | 471 |
Swell 2 Height (m) Direction Period (s) | — | — | SE 13 | SE 12 | E 10 | E 9 | — | E 8 | SE 9 | E 10 | SE 8 | E 9 | E 10 | E 9 | E 9 | SE 9 | — | ENE 9 | ENE 9 | E 9 | E 10 |
| kJ | — | — | 63 | 141 | 17 | 15 | — | 10 | 62 | 8 | 30 | 7 | 7 | 7 | 7 | 3 | — | 8 | 8 | 27 | 30 |
Swell 3 Height (m) Direction Period (s) | — | — | SE 14 | — | NE 11 | N 11 | — | — | E 8 | E 10 | E 7 | — | — | — | E 6 | — | — | — | — | — | — |
| kJ | — | — | 64 | — | 5 | 2 | — | — | 10 | 7 | 14 | — | — | — | 1 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NW 7 | WNW 9 | WSW 8 | SW 9 | SW 9 | SW 9 | SW 9 | SSW 9 | — | SSW 9 | — | SSW 9 | SSW 9 | SW 9 | SW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | — | — |
| kJ | 795 | 2799 | 1883 | 2356 | 1379 | 1059 | 1057 | 845 | — | 820 | — | 847 | 1109 | 885 | 1165 | 1037 | 749 | 911 | 699 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 390 | 148 | 390 | 316 | 316 | 329 | 375 | 996 | 375 | 375 | 363 | 1160 | 363 | 14 | 935 | 14 | 859 | 859 | 511 | 511 | 859 |
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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