Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 8 Jul 2026:
- Best quality surf: Thursday 9 Jul, 8AM (local time) - 11ft (3.5m), 17s period, E swell with offshore winds.
- Most powerful swell: Friday 10 Jul, 8PM (local time) - 20ft (6.0m), 18s period, E swell with 22,752 kJ wave energy.
- Next surfable swell (1★+): Thursday 9 Jul, 5AM (local time) - 10ft (3.0m), 17s 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 Thursday (Jul 09) at 5AM. The primary swell is predicted to be 3.0m and 17s period with a secondary swell of 0.7m and 7s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Nanwan Beach (South Bay) in the next 16 days are 6.0m 18s and forecast to arrive on Friday (Jul 10) at 8PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 5.5m 17s period and expected on Saturday (Jul 11) at 2AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Thu 9th Jul) | 10ft (3.0m) 17s |
| Best Surf | 8AM (Thu 9th Jul) | 11ft (3.5m) 17s |
| Most Powerful | 8PM (Fri 10th Jul) | 20ft (6.0m) 18s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
Alright, this is Rusty. Let's get real about Nanwan Beach.
For the next 16 days, we start with a massive pulse of east swell that’s just too heavy for this spot. Beginning Thursday, July 9th, it’s pumping 12 feet from the E/SE with a very long period of 17 seconds. The combined energy is through the roof (7693-21390). The wind is offshore, making it glassy clean, but this is big wave territory – way over 8 feet. Only for the experts. The water temp is about average for this time of year.
Friday, July 10th, is the peak: 18 feet of swell with an 18-second period and energy readings over 19,000. Again, offshore wind, but the size is intimidating. This is the true standout for the big-wave chargers. The swell direction is straight from the east, which is bang on the optimum.
Then, from Saturday, July 11th, it all goes to hell. A severe gale from the WSW with 50 mph winds shreds the surface. The swell drops but is still big and short-period, creating total chaos. That poor surf sticks around for days with onshore winds and lumpy chop. There’s a slight chance on Wednesday, July 22nd morning – a clean 10-foot swell with a light offshore breeze from the NE, which scores a 3/10, but it’s still a messy cross-chop underneath. Mostly, from the 11th onward, this looks more interesting for kite surfing than paddle surfing. For the average surfer, the only real action is Thursday and Friday of this week, if you’re a big-wave specialist. Otherwise, it’s a long stretch of nothing good.
Rusty.
Short Range ForecastHeavy rain (total 24mm), heaviest during Sat morning. Warm (max 30°C on Thu morning, min 28°C on Wed night). Winds increasing (calm on Thu night, stormy winds from the WNW by Fri night). | Days 5-7 Weather SummaryHeavy rain (total 49mm), heaviest during Sat night. Warm (max 30°C on Sat night, min 28°C on Mon night). Winds decreasing (near gales from the SW on Sat night, light winds from the S by Mon night). | ||||||||||||||||||||
Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wed 15 | |||||||||||||||
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) | E 17 | E 17 | E 17 | E 18 | E 18 | E 18 | ENE 17 | WSW 9 | WSW 9 | SW 10 | SW 10 | SW 9 | SW 10 | SW 10 | SSW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3833 | 7563 | 9002 | 15247 | 19529 | 21390 | 0 | 5581 | 3911 | 4220 | 2476 | 1645 | 1319 | 858 | 698 | 724 | 507 | 538 | 380 | 303 | 327 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | off | off | cross-off | cross-off | cross-off | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross-on |
High Tide | 1:27AM0.90m | 2:01PM0.61m | 2:21AM1.01m | 3:54PM0.55m | 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 | ||||||||
Low Tide | 8:27AM0.38m | 7:08PM0.41m | 9:59AM0.26m | 7:53PM0.45m | 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 | ||||||||
 |  |  | | |  |  |  | | | | | | | | | | | | | | |
 | — | 5:18 | — | — | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — | 5:22 | — |
 | 6:44 | — | 6:44 | — | — | 6:44 | — | — | 6:44 | — | — | 6:43 | — | — | 6:43 | — | — | 6:43 | — | — | 6:43 |
mm | — | — | — | — | — | 2 | 4 | 8 | 10 | 6 | 4 | 5 | 13 | 7 | 4 | 7 | 2 | 1 | 3 | 2 | 2 |
Temp °C | 29 | 30 | 30 | 29 | 29 | 29 | 29 | 28 | 29 | 30 | 29 | 29 | 29 | 30 | 29 | 29 | 29 | 30 | 28 | 29 | 29 |
Feels °C | 32 | 31 | 31 | 32 | 28 | 31 | 29 | 18 | 23 | 26 | 28 | 30 | 31 | 34 | 33 | 34 | 31 | 30 | 29 | 30 | 31 |
Swell 1 Height (m) Direction Period (s) | E 17 | E 17 | E 17 | E 18 | E 18 | E 18 | ENE 17 | NE 15 | NE 14 | SE 11 | SE 11 | SE 10 | SE 10 | SW 10 | SSW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | ESE 7 |
| kJ | 3833 | 7563 | 9002 | 15247 | 19529 | 21390 | 16433 | 3715 | 579 | 180 | 297 | 335 | 188 | 858 | 698 | 724 | 507 | 538 | 380 | 303 | 170 |
Swell 2 Height (m) Direction Period (s) | WSW 7 | WSW 7 | W 7 | — | — | WNW 7 | — | SE 13 | SE 14 | ENE 11 | E 10 | E 9 | E 8 | SE 9 | W 9 | SE 8 | SE 8 | SE 8 | E 9 | — | SW 10 |
| kJ | 44 | 51 | 61 | — | — | 160 | — | 6 | 65 | 41 | 17 | 14 | 21 | 99 | 101 | 57 | 28 | 35 | 7 | — | 327 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SE 14 | — | — | — | — | E 8 | SE 9 | E 7 | ESE 9 | SE 8 | E 12 | — | SSW 12 |
| kJ | — | — | — | — | — | — | — | — | 30 | — | — | — | — | 19 | 61 | 15 | 8 | 34 | 3 | — | 49 |
Wind waves Height (m) Direction Period (s) | — | W 7 | WNW 7 | — | WNW 6 | NW 8 | NW 9 | WSW 9 | WSW 9 | SW 10 | SW 10 | SW 9 | SW 10 | — | — | — | ENE 4 | ESE 7 | ESE 6 | ESE 7 | — |
| kJ | — | 79 | 82 | — | 119 | 603 | 3051 | 5581 | 3911 | 4220 | 2476 | 1645 | 1319 | — | — | — | 28 | 118 | 144 | 290 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 2 | 2 | 348 | 390 | 676 | 390 | 390 | 390 | 1253 | 329 | 996 | 42 | 375 | 316 | 316 | 859 | 378 | 148 | 378 | 378 |
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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