
Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 24 Jul 2026:
- Best quality surf: Sunday 26 Jul, 5PM (local time) - 6.5ft (2.0m), 10s period, WSW swell with cross-offshore winds.
- Most powerful swell: Saturday 25 Jul, 5AM (local time) - 13ft (4.0m), 10s period, ESE swell with 2,987 kJ wave energy.
- Next surfable swell (1★+): Sunday 26 Jul, 5PM (local time) - 6.5ft (2.0m), 10s period with WSW 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 (Jul 26) at 5PM. The primary swell is predicted to be 2.0m and 10s period with a secondary swell of 0.4m and 10s. Another secondary swell of 1.0m and 7s is also forecast. 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 Saturday (Jul 25) at 5AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Friday (Jul 31) at 11PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Sun 26th Jul) | 6.5ft (2.0m) 10s |
| Best Surf | 5PM (Sun 26th Jul) | 6.5ft (2.0m) 10s |
| Most Powerful | 5AM (Sat 25th Jul) | 13ft (4.0m) 10s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s cooking for Nanwan Beach (South Bay). It’s a beach and reef setup, fairly exposed to the swell, and it's kicking off right now.
The water temp is sitting right around average for the time of year, so nothing wild there.
We’ve got a pretty rough start. Right now and through the first few days, the wind is a real problem. We’re looking at a fresh cross-onshore breeze on Saturday morning, gusting 22 mph, with a solid 12 ft swell but it’s just messy. The combined energy is pumping at 2401, but it’s all for nothing with that wind. That’s a kite-surfing setup, not a paddle one. Saturday afternoon barely improves, and Sunday morning is still a cross-shore mess.
The first real window of opportunity shows up on Sunday afternoon, July 26th. The wind swings light and cross-offshore, and the swell drops to a clean 7 ft from the WSW. The energy is still moderate at 899, but the clean conditions make it rideable. It’s a decent session, but not the standout.
The next big one to keep an eye on is Saturday, August 1st. The afternoon looks promising: a 7 ft swell from the ESE, with a moderate cross-offshore breeze keeping things clean. The energy jumps up to 1391, which is a solid push. This is a good shout for a weekend surf.
But the real standout, the one you want to circle on the calendar, is Tuesday morning, August 4th. The wind is light, barely a breeze, with an 8 ft swell from the SW. That’s a solid size, right on the edge for intermediates, but the energy is strong at 1333. The conditions are clean, and the swell direction is straight from the optimum. This is the best of the bunch.
After that, things get a bit wild again. The wind picks up heavily, and we see some big, messy swells. The last real highlight is Saturday, August 8th, in the afternoon. The wind goes glassy, dead calm, with a 10 ft swell from the SW. That's a big, powerful groundswell with a period of 11 seconds, and the energy is a massive 2151. This is excellent for experienced surfers, but it’s a heavy wave. For the average punter, that’s a big step up.
There’s a gap of rough conditions from late July through early August, but the few clean windows we have are worth the wait. The long-range stuff on the 8th is promising, but we’ll have to see how it shapes up.
Rusty.
Short Range ForecastHeavy rain (total 101mm), heaviest during Sat night. Warm (max 28°C on Fri night, min 26°C on Sat afternoon). Winds decreasing (strong winds from the ENE on Fri night, light winds from the NE by Sun afternoon). | Days 5-7 Weather SummaryModerate rain (total 15mm), heaviest on Mon night. Warm (max 29°C on Tue afternoon, min 27°C on Mon night). Mainly fresh winds. | ||||||||||||||||||
Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | ||||||||||||||
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) | ESE 10 | SE 10 | SSW 10 | SW 10 | SW 10 | WSW 10 | WSW 10 | W 9 | W 8 | SSW 8 | SSW 8 | SSW 8 | SW 9 | SW 9 | SSW 9 | SSW 9 | SSW 9 | SW 11 | SSW 10 |
Wave Graph | |||||||||||||||||||
2651 | 2396 | 1196 | 1126 | 723 | 763 | 666 | 256 | 93 | 173 | 198 | 224 | 249 | 216 | 307 | 300 | 244 | 476 | 320 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross | cross | cross-off | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross-on |
High Tide | 3:22AM1.01m | 4:12AM1.07m | 6:57PM0.52m | 4:58AM1.12m | 7:11PM0.53m | 5:40AM1.17m | 7:28PM0.54m | 6:19AM1.20m | 7:48PM0.55m | 6:56AM1.22m | 8:10PM0.58m | ||||||||
Low Tide | 11:49AM0.23m | 12:24PM0.18m | 9:09PM0.50m | 12:56PM0.14m | 10:13PM0.47m | 1:27PM0.12m | 11:04PM0.43m | 1:56PM0.12m | 11:49PM0.40m | 2:23PM0.12m | 00:31AM0.37m | ||||||||
— | 5:26 | — | — | 5:26 | — | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — | 5:28 | — | — | |
6:39 | — | 6:39 | — | — | 6:38 | — | — | 6:38 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | |
mm | 12 | 17 | 25 | 23 | 1 | 5 | 7 | 7 | 4 | 10 | 4 | 1 | — | — | — | — | — | — | 1 |
Temp °C | 28 | 28 | 27 | 26 | 27 | 27 | 27 | 28 | 28 | 27 | 28 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 |
Feels °C | 25 | 26 | 28 | 28 | 29 | 31 | 28 | 28 | 28 | 28 | 28 | 29 | 30 | 29 | 30 | 30 | 31 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | E 17 | ENE 10 | SSW 10 | SW 10 | SW 10 | WSW 10 | WSW 10 | W 9 | SSW 7 | SSW 8 | SSW 8 | SSW 8 | SW 9 | SW 9 | SSW 9 | SSW 9 | SSW 9 | SW 11 | SSW 10 |
6 | 21 | 1196 | 1126 | 723 | 763 | 666 | 256 | 93 | 173 | 198 | 224 | 249 | 216 | 307 | 300 | 244 | 476 | 320 | |
Swell 2 Height (m) Direction Period (s) | E 17 | E 16 | SSE 9 | ESE 8 | ESE 8 | SE 10 | SSW 7 | SSW 7 | W 8 | WSW 7 | SE 10 | ESE 10 | ESE 10 | SSE 5 | ESE 10 | ESE 10 | ESE 10 | ESE 9 | ESE 10 |
5 | 5 | 232 | 300 | 138 | 25 | 57 | 84 | 90 | 17 | 28 | 21 | 20 | 25 | 32 | 19 | 18 | 9 | 9 | |
Swell 3 Height (m) Direction Period (s) | — | — | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ENE 9 | ENE 9 | ENE 8 | ESE 10 | E 16 | ENE 9 | E 9 | E 9 | E 9 |
— | — | 20 | 19 | 18 | 18 | 35 | 38 | 38 | 40 | 8 | 8 | 7 | 20 | 5 | 16 | 6 | 6 | 6 | |
Wind waves Height (m) Direction Period (s) | ESE 10 | SE 10 | ESE 9 | — | — | ESE 7 | E 5 | E 6 | E 6 | E 6 | E 5 | ESE 5 | ESE 5 | ENE 4 | SE 6 | SE 5 | E 3 | ENE 3 | ENE 4 |
2651 | 2396 | 716 | — | — | 111 | 85 | 52 | 55 | 23 | 18 | 30 | 38 | 14 | 30 | 8 | 1 | 3 | 4 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 591 | 148 | 148 | 79 | 148 | 0 | 148 | 449 | 148 | 148 | 451 | 148 | 451 | 451 | 451 | 494 | 451 | 42 | 42 |
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.










