Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 28 Jul 2026:
- Best quality surf: Tuesday 4 Aug, 2AM (local time) - 4ft (1.2m), 16s period, E swell with glassy winds.
- Most powerful swell: Tuesday 4 Aug, 5AM (local time) - 4ft (1.2m), 16s period, E swell with 737 kJ wave energy.
- Next surfable swell (1★+): Friday 31 Jul, 5AM (local time) - 2.5ft (0.7m), 8s 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 Friday (Jul 31) at 5AM. The primary swell is predicted to be 0.7m and 8s period with a secondary swell of 0.4m and 9s. 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 1.2m 16s and forecast to arrive on Tuesday (Aug 04) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Fri 31st Jul) | 2.5ft (0.7m) 8s |
| Best Surf | 2AM (Tue 4th Aug) | 4ft (1.2m) 16s |
| Most Powerful | 5AM (Tue 4th Aug) | 4ft (1.2m) 16s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
G’day, I’m Rusty, and here’s what’s brewing for your local waves over the next couple of weeks. The first six days, from Tuesday July 28th through Sunday August 2nd, are pretty much a flat, blown-out mess. We’ve got weak, short-period swell hanging around 0.6m to 0.9m from the SW, with cross and cross-onshore winds messing up the surface. The combined energy is weak, running between 52 and 140, so there’s no push. Late Friday the 31st the wind goes light offshore out of the NW for a bit, but the swell is only 0.6m—barely enough for a foamie. Crowds are often at Nanwan Beach (South Bay), but there’s nothing to crowd for right now.
The action finally kicks off on Monday August 3rd with a shift in swell direction to the east and a long-period groundswell of 15-17 seconds. Combined energy climbs to 213-336 (moderate), but cross-onshore winds keep it choppy and raw.
The standout is Tuesday August 4th: 1.4m east swell at 16 seconds, combined energy around 1040 (strong). The wind goes from light cross-onshore in the morning to a gentle cross-shore in the afternoon, which will tidy it up. This is your best window—cleaner, powerful, and with real potential. The water temp is 30°C, about 0.7°C above average, so it’s normal and warm.
Wednesday August 5th brings bigger energy: 1.7m from the east at 17 seconds, combined energy at 1835 (very strong). The morning wind is light onshore and it’s marginal with tides—expert-only territory if you paddle out. After that, the swell runs 1.5m to 2.4m through to the 12th, with mixed winds. Saturday August 8th morning sees a clean cross-offshore breeze from the WNW with 2.3m, 9-second SW swell and strong energy (901)—that’s a solid option for experienced surfers.
Wednesday August 12th is the final bright spot: 1.8m from the SSW, 11-second period, with a light offshore breeze from the north and combined energy at 877 (strong). Glassy, clean, and lined up for the morning.
So, lock in Tuesday the 4th or the morning of Wednesday the 12th—those are your real chances for something special. Rusty out.
Short Range ForecastSome drizzle, heaviest during Tue night. Warm (max 29°C on Tue morning, min 27°C on Tue night). Winds decreasing (fresh winds from the ENE on Wed morning, calm by Thu night). | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Fri afternoon. Warm (max 29°C on Fri morning, min 28°C on Fri morning). Wind will be generally light. | ||||||||||||||||||||
Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | |||||||||||||||
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) | SSW 7 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 7 | SW 8 | SW 8 | SW 7 | E 15 | E 15 | E 17 | E 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 96 | 82 | 86 | 78 | 77 | 78 | 78 | 78 | 67 | 49 | 49 | 49 | 35 | 34 | 36 | 35 | 34 | 72 | 157 | 281 | 723 |
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-on | cross | cross-on | off | cross-on | cross | cross-off | cross | cross-on | cross-on | cross-on | cross-on | cross-on | glassy |
High Tide | 7:28PM0.54m | 6:19AM1.20m | 7:48PM0.55m | 6:56AM1.22m | 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 | ||||||||
Low Tide | 1:27PM0.12m | 11:04PM0.43m | 1:56PM0.12m | 11:49PM0.40m | 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 | |||||||
 |  |  | | |  | | |  | |  | |  | | | | | | | | | |
 | 5:26 | — | — | 5:28 | — | — | 5:28 | — | — | 5:28 | — | — | 5:28 | — | — | 5:28 | — | — | 5:30 | — | — |
 | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:36 | — |
mm | — | — | 1 | — | — | — | — | — | — | — | 2 | — | 1 | 2 | — | — | — | 1 | — | 2 | 9 |
Temp °C | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 28 | 28 | 29 | 29 | 28 | 29 | 28 | 28 |
Feels °C | 29 | 29 | 31 | 29 | 30 | 31 | 31 | 31 | 31 | 33 | 34 | 32 | 32 | 32 | 32 | 30 | 30 | 31 | 31 | 30 | 31 |
Swell 1 Height (m) Direction Period (s) | SSW 7 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 7 | SW 8 | SW 8 | SW 7 | SW 7 | SW 7 | E 17 | E 16 |
| kJ | 96 | 82 | 86 | 78 | 77 | 78 | 78 | 78 | 67 | 49 | 49 | 49 | 35 | 34 | 36 | 35 | 34 | 42 | 44 | 281 | 723 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | E 9 | SSE 4 | SE 6 | SE 6 | SE 6 | SE 6 | ESE 6 | E 9 | E 9 | ESE 9 | E 15 | E 15 | SW 7 | SW 7 |
| kJ | 28 | 26 | 20 | 20 | 20 | 19 | 18 | 15 | 3 | 13 | 10 | 9 | 9 | 7 | 6 | 6 | 16 | 72 | 157 | 43 | 56 |
Swell 3 Height (m) Direction Period (s) | W 6 | W 6 | ENE 8 | E 10 | ENE 9 | ENE 9 | ENE 9 | ESE 9 | ESE 9 | E 9 | E 8 | E 10 | ESE 9 | E 9 | ESE 6 | ESE 9 | E 9 | E 9 | E 8 | E 8 | ESE 9 |
| kJ | 3 | 1 | 7 | 2 | 8 | 8 | 8 | 8 | 8 | 6 | 13 | 8 | 8 | 15 | 3 | 8 | 6 | 14 | 12 | 12 | 8 |
Wind waves Height (m) Direction Period (s) | E 4 | E 4 | E 4 | E 4 | ESE 4 | ESE 5 | ESE 4 | SE 4 | ESE 5 | E 5 | — | — | — | E 3 | ESE 3 | ESE 6 | — | — | — | — | — |
| kJ | 13 | 27 | 17 | 28 | 15 | 15 | 13 | 9 | 4 | 1 | — | — | — | 1 | 2 | 6 | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 451 | 451 | 79 | 451 | 451 | 79 | 451 | 451 | 79 | 451 | 2 | 511 | 996 | 2 | 1195 | 667 | 693 | 42 | 694 | 148 | 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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