Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 4 Aug 2026:
- Best quality surf: Sunday 9 Aug, 5AM (local time) - 11ft (3.5m), 9s period, WSW swell with cross-offshore winds.
- Most powerful swell: Wednesday 5 Aug, 8AM (local time) - 6ft (1.9m), 18s period, E swell with 2,222 kJ wave energy.
- Next surfable swell (1★+): Wednesday 5 Aug, 2AM (local time) - 5ft (1.6m), 18s 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 Wednesday (Aug 05) at 2AM. The primary swell is predicted to be 1.6m and 18s period with a secondary swell of 0.4m and 7s. Another secondary swell of 0.8m and 6s 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 1.9m 18s and forecast to arrive on Wednesday (Aug 05) at 8AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 18s period and expected on Thursday (Aug 06) at 5PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Wed 5th Aug) | 5ft (1.6m) 18s |
| Best Surf | 5AM (Sun 9th Aug) | 11ft (3.5m) 9s |
| Most Powerful | 8AM (Wed 5th Aug) | 6ft (1.9m) 18s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, let’s have a look at what’s cooking for Nanwan Beach.
Water temp is sitting at 85°, which is right about average for this time of year – nothing weird, just your standard warm water.
The pattern over the next two weeks is a real mixed bag. We kick off with a nice pulse of long-period groundswell Tuesday afternoon, but the wind is cross and it’s a bit sloppy. The real standout for experienced surfers lands on Wednesday morning, August 5th. That’s the one to circle.
Wednesday morning, August 5th – Nanwan Beach (South Bay) is firing. You’ve got clean 6ft swell from the East with a very long 17-second period – that’s proper groundswell with real grunt, better for points and reefs than beach breaks. The wind is light and cross-offshore from the WNW, keeping the surface buttery. Combined wave energy is strong at (2207). This is for experienced surfers only – beginners stay out.
From Wednesday afternoon through Saturday August 9th, the wind cranks up from the west at 25 to 28 mph, and the swell pushes well over 8ft. That’s too big and blown out for normal paddling – honestly, this stretch looks more fun for kite surfing than surfboards.
Sunday morning, August 9th, the swell hits 12ft from the WSW, wind still howling at 25 mph. Energy is huge at (1630), but it’s just too big for this break. Only the brave. The whole week from August 11th to 12th stays big and marginal with strong winds.
Things finally settle by Thursday morning, August 13th. That morning offers a solid 8ft swell from the SW with a 10-second period, clean conditions with gentle cross-offshore wind, and strong energy (1501). Another good window for experienced surfers. The following days through to Sunday August 16th drop in size gradually, with clean conditions and chest-to-head high swell – solid intermediate stuff, but not epic.
There’s a long gap of poor conditions from Monday August 17th onwards, with onshore and cross-shore winds messing things up through the 19th.
So if you’re picking your moment, Wednesday morning August 5th is the clear standout – clean, powerful, and long-period. If that’s too early, Thursday morning August 13th is your backup with solid 8ft and clean conditions. The rest is either too big, too windy, or too weak.
Rusty.
Short Range ForecastSome drizzle, heaviest during Thu night. Warm (max 30°C on Tue afternoon, min 27°C on Tue night). Winds increasing (calm on Wed night, strong winds from the WNW by Fri morning). | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Sun afternoon. Warm (max 30°C on Sat afternoon, min 28°C on Fri night). Mainly strong winds. | |||||||||||||||||||
Tue 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | ||||||||||||||
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) | E 16 | E 18 | E 17 | W 6 | SSW 9 | WSW 8 | SW 8 | WSW 8 | SW 8 | SW 8 | ENE 16 | WSW 8 | WSW 8 | WSW 9 | WSW 9 | WSW 9 | SW 9 | SW 9 | SW 9 | SW 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 1106 | 1561 | 2196 | 20 | 49 | 98 | 129 | 173 | 100 | 132 | 0 | 770 | 902 | 1448 | 1619 | 1549 | 1733 | 1684 | 1416 | 1768 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 10:43PM0.86m | 10:48AM0.72m | 11:31PM0.93m | 12:04PM0.58m | 00:31AM0.99m | 2:26PM0.49m | 1:43AM1.07m | 5:31PM0.49m | 2:58AM1.15m | 6:13PM0.51m | 4:05AM1.24m | 6:39PM0.52m | ||||||||
Low Tide | 4:18PM0.31m | 5:01AM0.38m | 4:40PM0.37m | 6:37AM0.37m | 5:03PM0.41m | 8:36AM0.31m | 5:28PM0.46m | 10:14AM0.20m | 6:01PM0.49m | 11:21AM0.09m | 8:02PM0.49m | 12:12PM0.02m | 9:36PM0.46m | |||||||
 |  | |  | | | |  | | | | | | | |  |  | | | | |
 | — | — | 5:30 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — |
 | 6:35 | — | — | 6:34 | — | — | 6:34 | — | — | 6:32 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — |
mm | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | 1 | 1 | 1 | — | 2 |
Temp °C | 30 | 28 | 29 | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 |
Feels °C | 31 | 30 | 33 | 32 | 33 | 32 | 31 | 33 | 28 | 27 | 29 | 28 | 29 | 29 | 29 | 29 | 31 | 28 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | E 16 | E 18 | E 17 | ENE 17 | ENE 18 | ENE 18 | ENE 18 | ENE 18 | ENE 17 | ENE 17 | ENE 16 | NE 15 | NE 16 | NE 16 | NE 16 | NE 16 | NE 15 | NE 15 | NE 16 | NE 15 |
| kJ | 1106 | 1561 | 2196 | 2062 | 2552 | 4280 | 4598 | 5163 | 4757 | 5177 | 2567 | 1297 | 1374 | 1494 | 1532 | 1402 | 1349 | 1046 | 871 | 509 |
Swell 2 Height (m) Direction Period (s) | SW 7 | SW 7 | SW 7 | SE 9 | SSW 9 | — | — | — | SW 8 | SW 8 | — | SE 10 | — | — | SSE 11 | SSE 10 | SE 10 | SE 10 | ENE 15 | ENE 14 |
| kJ | 12 | 12 | 11 | 13 | 49 | — | — | — | 100 | 132 | — | 4 | — | — | 11 | 11 | 17 | 16 | 42 | 70 |
Swell 3 Height (m) Direction Period (s) | E 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | E 15 | E 15 | E 15 | SE 10 | SE 10 |
| kJ | 12 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | 4 | 17 | 15 | 16 |
Wind waves Height (m) Direction Period (s) | E 6 | E 6 | — | W 6 | — | WSW 8 | SW 8 | WSW 8 | WNW 6 | WNW 6 | WSW 6 | WSW 8 | WSW 8 | WSW 9 | WSW 9 | WSW 9 | SW 9 | SW 9 | SW 9 | SW 10 |
| kJ | 76 | 40 | — | 20 | — | 98 | 129 | 173 | 154 | 154 | 253 | 770 | 902 | 1448 | 1619 | 1549 | 1733 | 1684 | 1416 | 1768 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 676 | 0 | 0 | 2 | 2 | 451 | 148 | 148 | 676 | 148 | 42 | 42 | 42 | 148 | 42 | 42 | 148 | 316 | 316 | 148 |
Best forecast wave conditions in South Taiwan | ||||||||||||||||||||
Best forecast wave conditions in Taiwan | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Latest Updates
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Nanwan Beach (South Bay) surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest