Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 23 Jul 2026:
- Best quality surf: Saturday 25 Jul, 5PM (local time) - 11ft (3.5m), 10s period, SSE swell with cross-shore winds.
- Most powerful swell: Wednesday 29 Jul, 5AM (local time) - 13ft (4.0m), 9s period, SE swell with 2,632 kJ wave energy.
- Next surfable swell (1★+): Saturday 25 Jul, 5PM (local time) - 11ft (3.5m), 10s period with SSE 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 Saturday (Jul 25) at 5PM. The primary swell is predicted to be 3.5m and 10s period with a secondary swell of 2.5m and 10s. Another secondary swell of 2.3m and 9s is also forecast. The wind is predicted to be cross-shore as the swell arrives.
The most powerful waves expected at Nanwan Beach (South Bay) in the next 16 days are 4.0m 9s and forecast to arrive on Wednesday (Jul 29) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 8s period and expected on Friday (Jul 24) at 8PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Sat 25th Jul) | 11ft (3.5m) 10s |
| Best Surf | 5PM (Sat 25th Jul) | 11ft (3.5m) 10s |
| Most Powerful | 5AM (Wed 29th Jul) | 13ft (4.0m) 9s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Rusty here, and I gotta be straight with you—this 16‑day stretch for Nanwan Beach (South Bay) is a real bummer. The water’s sittin’ at about 85°, which is normal for this time of year, but that’s about the only thing that’s cooperating. The forecast is packed with poor surf conditions from start to finish, and there’s not a single true standout to get excited about.
We kick off Thursday the 23rd with tiny 1.6 ft swell out of the SW, period a weak 7 s, and a light WNW breeze keeping it clean but the energy’s pathetic (31). Friday the 24th stays small and messy—1.3 ft in the morning, then 1.0 ft in the afternoon with a stiff NE breeze and a risk of thunderstorms. Surf’s barely worth paddling for.
Saturday the 25th sees a jump in size—8.2 ft on the morning from the south, but it’s cross‑onshore at 19 mph and the quality is poor. The afternoon brings 11.5 ft from the SSW with a period of 11 s, but the wind is light cross‑onshore and the report says it’s too big for the break. That’s a session for experts only, and even then the lumpy conditions won’t do it justice. The combined energy is huge (3484) but the wind and tide are against us. If you’re into kiting, the morning setup with 8.2 ft and a strong cross‑onshore might be more interesting than paddling.
Sunday 26th through Wednesday 29th stays in the 3.9 ft to 7.9 ft range, but every session is rated poor—cross‑shore winds, cross‑chop, thunderstorms, and short periods. The energy varies from 326 to 970, but none of it translates to rideable waves. Thursday 30th and Friday 31st see a slight drop to 3.6–5.9
Short Range ForecastHeavy rain (total 70mm), heaviest during Sat night. Warm (max 30°C on Fri morning, min 25°C on Sat night). Winds increasing (calm on Thu afternoon, strong winds from the NE by Fri night). | Days 5-7 Weather SummaryHeavy rain (total 83mm), heaviest during Wed morning. Warm (max 29°C on Mon afternoon, min 25°C on Wed morning). Mainly strong winds. | |||||||||||||||||||
Thu 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | ||||||||||||||
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 7 | SW 7 | SW 7 | SW 7 | E 9 | ESE 9 | SSE 10 | SW 10 | SW 10 | WSW 10 | WSW 9 | E 6 | E 6 | E 6 | ESE 7 | SE 8 | SE 9 | SE 9 | SE 8 | SSW 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 23 | 16 | 12 | 7 | 1587 | 2083 | 2488 | 992 | 723 | 511 | 280 | 154 | 162 | 247 | 394 | 452 | 1611 | 1655 | 878 | 227 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-off | cross-off | cross-off | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 3:19PM0.48m | 2:28AM0.96m | 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 | |||||||||
Low Tide | 5:47PM0.47m | 11:05AM0.30m | 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 | |||||||||
 |  | |  |  | | | | | | | | | | |  | | | | | |
 | — | — | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — |
 | 6:40 | — | — | 6:39 | — | — | 6:39 | — | — | 6:38 | — | — | 6:38 | — | — | 6:38 | — | — | 6:37 | — |
mm | — | — | — | 3 | 13 | 7 | 15 | 30 | 2 | 5 | 9 | 5 | 2 | 5 | 6 | 10 | 15 | 26 | 32 | 17 |
Temp °C | 29 | 29 | 30 | 30 | 28 | 27 | 27 | 26 | 28 | 28 | 27 | 28 | 29 | 28 | 28 | 28 | 28 | 25 | 25 | 27 |
Feels °C | 33 | 32 | 31 | 29 | 25 | 25 | 27 | 29 | 28 | 28 | 28 | 26 | 27 | 27 | 26 | 28 | 27 | 23 | 23 | 25 |
Swell 1 Height (m) Direction Period (s) | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SSW 10 | SW 10 | SW 10 | WSW 10 | WSW 9 | W 9 | SW 8 | SW 8 | SW 8 | SW 9 | SW 9 | SW 9 | SSW 9 | SSW 9 |
| kJ | 23 | 16 | 12 | 7 | 2 | 2 | 1201 | 992 | 723 | 511 | 280 | 139 | 45 | 46 | 29 | 84 | 81 | 93 | 133 | 227 |
Swell 2 Height (m) Direction Period (s) | ENE 9 | ENE 12 | E 10 | NW 4 | E 17 | E 16 | ESE 9 | ESE 8 | SE 8 | ESE 7 | SE 10 | SW 7 | W 9 | ESE 10 | E 11 | — | ENE 8 | E 16 | E 16 | SSE 7 |
| kJ | 16 | 13 | 7 | 1 | 6 | 5 | 878 | 322 | 69 | 102 | 28 | 44 | 54 | 20 | 2 | — | 7 | 5 | 5 | 115 |
Swell 3 Height (m) Direction Period (s) | E 10 | E 10 | SE 10 | E 18 | — | — | SSE 9 | ENE 10 | ESE 10 | SE 10 | E 15 | SE 10 | SE 10 | W 7 | — | — | — | — | — | E 16 |
| kJ | 8 | 8 | 4 | 6 | — | — | 199 | 19 | 38 | 25 | 4 | 25 | 25 | 9 | — | — | — | — | — | 5 |
Wind waves Height (m) Direction Period (s) | — | ENE 4 | NE 5 | ENE 7 | E 9 | ESE 9 | SSE 10 | — | ENE 4 | — | E 5 | E 6 | E 6 | E 6 | ESE 7 | SE 8 | SE 9 | SE 9 | SE 8 | E 5 |
| kJ | — | 17 | 110 | 482 | 1587 | 2083 | 2488 | — | 46 | — | 104 | 154 | 162 | 247 | 394 | 452 | 1611 | 1655 | 878 | 51 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 79 | 329 | 693 | 676 | 591 | 148 | 148 | 79 | 148 | 378 | 148 | 449 | 449 | 148 | 511 | 148 | 378 | 451 | 378 | 494 |
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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