Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 30 Jul 2026:
- Best quality surf: Tuesday 4 Aug, 2PM (local time) - 5ft (1.6m), 18s period, E swell with cross-offshore winds.
- Most powerful swell: Wednesday 5 Aug, 8AM (local time) - 6.5ft (2.0m), 18s period, E swell with 2,484 kJ wave energy.
- Next surfable swell (1★+): Monday 3 Aug, 2AM (local time) - 1.5ft (0.5m), 16s period with E 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 03) at 2AM. The primary swell is predicted to be 0.5m and 16s period with a secondary swell of 0.8m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Nanwan Beach (South Bay) in the next 16 days are 2.0m 18s and forecast to arrive on Wednesday (Aug 05) 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 3.5m 19s period and expected on Thursday (Aug 06) at 11AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Mon 3rd Aug) | 1.5ft (0.5m) 16s |
| Best Surf | 2PM (Tue 4th Aug) | 5ft (1.6m) 18s |
| Most Powerful | 8AM (Wed 5th Aug) | 6.5ft (2.0m) 18s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, let’s break it down. The first few days are a bust. Nothing worth grabbing your board for. Tiny waves, weak energy, and the wind is a mess. We’re looking at about four days of poor surf, with waves around 1ft to 2ft and short, choppy periods.
Then, on Monday, August 3rd, things start to wake up. By the afternoon, we’ve got a 3ft east swell with a very long 16-second period. The wind is glassy, and the combined energy is 468 (moderate). This is a prime window for the patient surfer, but it’s still small. The long period might make it a bit weird for a beach break, but the clean conditions are a huge plus.
The standout is Tuesday, August 4th. By Tuesday afternoon, we’re looking at 6ft of east swell with an 18-second period – that’s very long period groundswell. The wind is cross-offshore from the west-northwest, and the combined energy is a massive 1919 (strong to very strong). This is excellent surf for experienced surfers. The size is over 5ft, so it’s not for beginners. The quality here is the best of the whole run.
After that, it gets nasty. Winds ramp up hard from Wednesday through the weekend, with huge swell but terrible conditions. By August 7th and 8th, we’ve got 10ft to 16ft of swell, but winds are blowing 35 to 37 mph, making it a washout for paddle surfing. This is more of a kite surfing setup. The energy is off the charts, but it’s too blown out and dangerous.
Things settle down again around August 11th and 12th. Tuesday afternoon, August 11th, offers 8ft from the southwest with a 10-second period, clean cross-off winds, and a combined energy of 1090 (moderate). That’s another good window for experienced surfers. Then Wednesday morning, August 12th, is glassy with 7ft swell – a real treat for those who can get out. The water temperature is about 85°, which is normal for the time of year, so no wetsuit needed.
The last few days fade back to smaller, weaker swells with onshore winds. Nothing special.
Bottom line: mark your calendar for Monday afternoon, August 3rd, for a clean, glassy, long-period swell, and Tuesday afternoon, August 4th, for the biggest, most powerful surf of the period. Crowds are common at Nanwan Beach, so expect some company.
Rusty.
Short Range ForecastSome drizzle, heaviest during Sat morning. Warm (max 29°C on Thu afternoon, min 27°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 29°C on Sun afternoon, min 27°C on Sun night). Wind will be generally light. | |||||||||||||||||||
Thu 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | ||||||||||||||
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 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 7 | SW 7 | SW 7 | SW 8 | SW 8 | E 16 | E 15 | E 16 | E 17 | E 16 | E 18 | E 18 | WSW 7 | WSW 7 | WSW 6 |
Wave Graph  | ||||||||||||||||||||
 kJ | 53 | 51 | 36 | 39 | 28 | 19 | 17 | 17 | 18 | 57 | 133 | 225 | 402 | 443 | 1206 | 1882 | 2273 | 41 | 40 | 57 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | glassy | cross-on | glassy | cross-on | glassy | cross-on | cross-on | glassy | cross-on | glassy | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 8:10PM0.58m | 7:31AM1.20m | 8:34PM0.61m | 8:05AM1.16m | 9:01PM0.66m | 8:39AM1.09m | 9:30PM0.72m | 9:16AM0.99m | 10:03PM0.79m | 9:57AM0.86m | 10:43PM0.86m | 10:48AM0.72m | 11:31PM0.93m | |||||||
Low Tide | 2:23PM0.12m | 00:31AM0.37m | 2:49PM0.14m | 1:14AM0.35m | 3:12PM0.17m | 1:59AM0.35m | 3:34PM0.21m | 2:49AM0.36m | 3:56PM0.26m | 3:48AM0.37m | 4:18PM0.31m | 5:01AM0.38m | 4:40PM0.37m | |||||||
 |  | | | |  | | |  | |  | | | | | | | | |  | |
 | — | — | 5:28 | — | — | 5:28 | — | — | 5:28 | — | — | 5:30 | — | — | 5:30 | — | — | 5:30 | — | — |
 | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — |
mm | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 29 | 28 | 29 | 29 | 28 | 28 | 28 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 |
Feels °C | 31 | 31 | 33 | 33 | 33 | 33 | 32 | 32 | 32 | 31 | 32 | 32 | 32 | 33 | 31 | 31 | 31 | 31 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 7 | SW 7 | SW 7 | SW 7 | SW 8 | SW 8 | SW 8 | E 16 | E 14 | E 16 | E 18 | E 18 | E 18 | ENE 18 | ENE 19 |
| kJ | 53 | 51 | 36 | 39 | 28 | 19 | 17 | 17 | 17 | 57 | 69 | 67 | 402 | 329 | 1206 | 1882 | 2273 | 2839 | 3093 | 4471 |
Swell 2 Height (m) Direction Period (s) | E 9 | ESE 9 | SE 6 | SE 6 | ESE 6 | ESE 6 | E 9 | E 9 | SW 8 | E 18 | E 16 | E 15 | SW 7 | E 17 | SW 7 | SW 7 | SW 7 | NE 19 | WSW 7 | — |
| kJ | 15 | 8 | 15 | 8 | 3 | 3 | 15 | 6 | 18 | 56 | 133 | 225 | 43 | 443 | 37 | 37 | 23 | 55 | 40 | — |
Swell 3 Height (m) Direction Period (s) | ESE 9 | E 9 | E 9 | E 8 | SSE 4 | ESE 9 | ESE 6 | ESE 10 | E 9 | E 6 | E 6 | E 8 | E 9 | SW 7 | SE 8 | — | — | — | — | — |
| kJ | 8 | 6 | 6 | 13 | 1 | 8 | 3 | 10 | 6 | 5 | 5 | 6 | 23 | 41 | 3 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | ESE 4 | SE 4 | — | — | — | — | — | — | — | — | — | E 6 | — | — | — | — | — | WSW 7 | — | WSW 6 |
| kJ | 7 | 6 | — | — | — | — | — | — | — | — | — | 11 | — | — | — | — | — | 41 | — | 57 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 535 | 511 | 1160 | 2 | 1160 | 2361 | 1232 | 535 | 838 | 42 | 0 | 42 | 0 | 0 | 2 | 0 | 0 | 2 | 42 | 2 |
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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