Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 8 Aug 2026:
- Best quality surf: Monday 10 Aug, 8AM (local time) - 11ft (3.5m), 10s period, SW swell with cross-offshore winds.
- Most powerful swell: Monday 10 Aug, 2AM (local time) - 11ft (3.5m), 10s period, SW swell with 2,577 kJ wave energy.
- Next surfable swell (1★+): Monday 10 Aug, 8AM (local time) - 11ft (3.5m), 10s 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 Monday (Aug 10) at 8AM. The primary swell is predicted to be 3.5m and 10s period. 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 3.5m 10s and forecast to arrive on Monday (Aug 10) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 13s period and expected on Sunday (Aug 09) at 8AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Mon 10th Aug) | 11ft (3.5m) 10s |
| Best Surf | 8AM (Mon 10th Aug) | 11ft (3.5m) 10s |
| Most Powerful | 2AM (Mon 10th Aug) | 11ft (3.5m) 10s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, Rusty here. Let's look at what's cooking for the next couple of weeks.
Honestly, the first week is a bit of a write-off. We've got solid swell rolling in, but the wind is just not playing ball. From Sunday the 9th right through the 14th, it's a mess of cross-shore and cross-offshore winds, mostly out of the west and southwest, with storm risks hanging around. The swell is there, around 6.6ft to 11.5ft from the SW with a period of 9 to 10 seconds, but the wave energy is strong (1621 to 2045), yet the conditions are just too lumpy and choppy to make it enjoyable. It's not a time to get excited.
Things start to look a little more promising from the 16th. For Nanwan Beach (South Bay), the morning of Sunday the 16th is still a bit marginal, but by Sunday afternoon, the wind drops to a gentle breeze from the west, going cross-offshore, and the skies clear. The swell is a clean 6.6ft from the SSW at 9 seconds, with moderate wave energy (678). This is the first real window where the surf is looking clean and rideable. The water temp is sitting at a typical 85.3°, so no surprises there.
The real standout, the one you want to circle on your calendar, is Sunday the 23rd. The morning is looking like a beast. We've got a 13.1ft swell from the SE, period of 8 seconds, and the wave energy is going through the roof at 2650. The wind is from the NW at 18.6 mph, going cross-offshore, which should keep things clean. The catch is that 13.1ft is huge, so this is strictly for experts. This is a big, powerful, and potentially dangerous day, so if you're not on a gun and ready for it, stay on the beach. The afternoon on the 23rd and the morning of the 24th also have massive swell (11.5ft to 13.1ft), but the wind gets messy again, so that early window on the 23rd is the one golden moment.
The morning of Saturday the 22nd is worth a mention too. The swell drops to 3.9ft from the SW, period of 10 seconds, with a glassy, flat wind and low wave energy (285). It's small, but it’ll be clean and perfect for a longboard or a funboard.
So, to sum it up: the first week is a pass. The second week has a couple of decent windows, but the big dog is Sunday the 23rd morning for the experts. For everyone else, the 16th and 22nd mornings offer cleaner, smaller options.
Short Range ForecastHeavy rain (total 65mm), heaviest during Tue night. Warm (max 30°C on Sun morning, min 28°C on Mon night). Winds decreasing (strong winds from the WSW on Sun morning, moderate winds from the WSW by Tue night). | Days 4-6 Weather SummaryHeavy rain (total 42mm), heaviest during Fri night. Warm (max 29°C on Wed morning, min 28°C on Wed morning). Mainly fresh winds. | ||||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | |||||||||||||||
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) | SW 9 | SW 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 9 | SW 10 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SSW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1608 | 1794 | 2577 | 2018 | 1591 | 1800 | 1151 | 899 | 1007 | 826 | 822 | 654 | 654 | 612 | 635 | 604 | 719 | 690 | 727 | 660 | 649 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross | cross | cross | cross | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross | cross | cross-off | cross | cross-off |
High Tide | 6:13PM0.51m | 4:05AM1.24m | 6:39PM0.52m | 5:05AM1.31m | 7:05PM0.54m | 5:59AM1.35m | 7:32PM0.57m | 6:48AM1.35m | 7:59PM0.62m | 7:33AM1.28m | 8:26PM0.69m | 8:15AM1.17m | 8:55PM0.76m | ||||||||
Low Tide | 11:21AM0.09m | 8:02PM0.49m | 12:12PM0.02m | 9:36PM0.46m | 12:56PM-0.02m | 10:47PM0.40m | 1:35PM-0.01m | 11:46PM0.34m | 2:10PM0.03m | 00:41AM0.30m | 2:39PM0.10m | 1:33AM0.28m | 3:05PM0.18m | 2:26AM0.28m | |||||||
 | |  | | | | | | | |  | | | | |  | | | | | | |
 | 5:31 | — | — | 5:31 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — |
 | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:28 | — |
mm | 5 | 5 | 9 | 4 | 4 | 12 | 6 | 5 | 15 | 3 | — | 2 | 2 | 1 | 3 | 6 | 7 | 18 | 13 | 10 | 8 |
Temp °C | 30 | 30 | 29 | 30 | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 |
Feels °C | 28 | 28 | 28 | 29 | 29 | 31 | 31 | 30 | 30 | 30 | 30 | 32 | 30 | 30 | 31 | 31 | 31 | 32 | 32 | 30 | 31 |
Swell 1 Height (m) Direction Period (s) | NE 13 | NE 12 | NE 15 | ENE 15 | ENE 15 | ENE 14 | SW 10 | SW 9 | ENE 12 | SW 9 | SW 9 | ENE 12 | ENE 11 | SW 9 | SW 9 | SSW 9 | SW 9 | ENE 10 | SW 9 | SW 9 | ENE 9 |
| kJ | 178 | 72 | 54 | 73 | 123 | 201 | 1151 | 899 | 117 | 826 | 822 | 77 | 47 | 612 | 635 | 604 | 719 | 18 | 727 | 660 | 8 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SSE 10 | SSE 10 | SE 10 | SE 10 | SE 10 | ENE 13 | ENE 13 | SE 9 | ENE 12 | ENE 12 | SE 8 | SE 8 | ENE 11 | ENE 10 | ENE 10 | NE 10 | SSE 8 | ENE 10 | ENE 10 | SSE 8 |
| kJ | 4 | 9 | 10 | 27 | 25 | 48 | 181 | 178 | 36 | 113 | 78 | 16 | 10 | 46 | 40 | 39 | 25 | 6 | 19 | 19 | 6 |
Swell 3 Height (m) Direction Period (s) | E 11 | ENE 15 | SSE 10 | NE 11 | NE 9 | — | SE 10 | SE 9 | — | SE 8 | SE 8 | NE 8 | N 8 | SE 8 | SE 8 | N 8 | SSE 8 | SE 11 | SE 11 | SE 11 | ESE 10 |
| kJ | 9 | 22 | 10 | 5 | 3 | — | 46 | 41 | — | 18 | 25 | 3 | 1 | 11 | 9 | 1 | 7 | 5 | 5 | 5 | 10 |
Wind waves Height (m) Direction Period (s) | SW 9 | SW 9 | SW 10 | SW 10 | SW 10 | SW 10 | — | — | SW 10 | — | — | SW 9 | SW 9 | — | — | — | — | SW 9 | — | — | SW 9 |
| kJ | 1608 | 1794 | 2577 | 2018 | 1591 | 1800 | — | — | 1007 | — | — | 654 | 654 | — | — | — | — | 690 | — | — | 649 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 148 | 316 | 316 | 148 | 148 | 148 | 348 | 348 | 148 | 316 | 42 | 329 | 363 | 42 | 14 | 14 | 639 | 42 | 14 | 14 | 14 |
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