
Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 7 Aug 2026:
- Best quality surf: Sunday 9 Aug, 8PM (local time) - 11ft (3.5m), 10s period, SW swell with cross-offshore winds.
- Most powerful swell: Monday 10 Aug, 5AM (local time) - 15ft (4.5m), 10s period, SW swell with 3,951 kJ wave energy.
- Next surfable swell (1★+): Sunday 9 Aug, 8PM (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 Sunday (Aug 09) at 8PM. The primary swell is predicted to be 3.5m and 10s period with a secondary swell of 0.3m and 10s. 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 4.5m 10s and forecast to arrive on Monday (Aug 10) 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 1.9m 15s period and expected on Friday (Aug 07) at 11PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Sun 9th Aug) | 11ft (3.5m) 10s |
| Best Surf | 8PM (Sun 9th Aug) | 11ft (3.5m) 10s |
| Most Powerful | 5AM (Mon 10th Aug) | 15ft (4.5m) 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 coming down the pipe for Nanwan Beach (South Bay). It's a beach and reef setup, fairly exposed to the swell, and it picks up waves from the SE, which is a good sign.
Right off the bat, the water's sitting at a balmy 85°, which is pretty much normal for this time of year, so no wetsuit worries.
We're starting with a bit of a quiet spell. The first few days are a write-off, honestly. The wind is howling and the surf is just messy. It's not until the 15th of August, Saturday morning, that we start to see something worth paddling out for. The swell drops to a clean 6 ft out of the SW, the wind turns light and cross-offshore, and the energy is moderate (544). It's not pumping, but it's clean and rideable.
The real standout, though, is the morning of Sunday the 16th of August. That's the pick of the forecast. We've got a clean 6 ft SW swell, but the wind goes completely glassy. That's a rare treat. The wave energy is still moderate (584), but the lack of any wind chop will make for some silky, clean lines. If you can get out for that morning session, do it. The water will be like a lake.
After that, Monday the 17th holds onto some decent, clean conditions with the wind staying light and cross-off. The swell eases a bit to 5 ft, but it's still very surfable.
The long-range view into the second week gets a bit shaky. The wind picks up again, and the swell drops off. There's a hint of a pulse on the 22nd of August with a 7 ft SSW groundswell, but the period is a long 11 seconds and the wind is cross-shore, making it look messy. That's a promise for the future, but not one I'd bank on just yet.
So, to sum it up: the first week is a bust. The window of fun is tight: Saturday the 15th through Monday the 17th. The absolute best bet is that glassy Sunday morning on the 16th. Get out there and enjoy it.
Rusty.
Short Range ForecastModerate rain (total 17mm), heaviest on Sun night. Warm (max 31°C on Sun morning, min 29°C on Fri afternoon). Mainly near gales. | Days 5-7 Weather SummaryHeavy rain (total 35mm), heaviest during Mon night. Warm (max 30°C on Mon night, min 28°C on Tue night). Mainly strong winds. | |||||||||||||||||||
Fri 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | ||||||||||||||
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 8 | WSW 6 | WSW 7 | WSW 7 | SW 8 | SW 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 9 | SW 10 | SW 10 | SW 9 | SW 9 | SW 9 |
Wave Graph | ||||||||||||||||||||
59 | 320 | 639 | 846 | 1301 | 2059 | 2358 | 3279 | 2987 | 2602 | 1954 | 1382 | 1199 | 1131 | 904 | 1088 | 985 | 835 | 770 | 764 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross-off | cross | cross | cross | cross | cross-off | cross-off | cross | cross-off | cross-off | cross-off |
High Tide | 2:26PM0.49m | 1:43AM1.07m | 5:31PM0.49m | 2:58AM1.15m | 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 | |||||||
Low Tide | 5:28PM0.46m | 10:14AM0.20m | 6:01PM0.49m | 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 | |||||||
— | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | |
6:32 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | |
mm | — | — | 1 | — | 2 | — | 1 | 7 | 6 | 3 | 8 | 2 | 2 | 8 | 3 | 2 | 5 | 2 | — | 2 |
Temp °C | 29 | 29 | 30 | 30 | 30 | 31 | 30 | 30 | 29 | 29 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 30 | 29 |
Feels °C | 26 | 27 | 28 | 28 | 28 | 29 | 27 | 26 | 26 | 27 | 27 | 29 | 29 | 30 | 29 | 29 | 30 | 29 | 29 | 30 |
Swell 1 Height (m) Direction Period (s) | ENE 16 | ENE 15 | NE 14 | NE 14 | NE 14 | NNE 14 | NNE 14 | NNE 13 | ENE 15 | ENE 15 | ENE 14 | ENE 13 | ENE 13 | ENE 12 | ENE 12 | ENE 12 | ENE 11 | ENE 11 | NE 11 | NE 10 |
2417 | 1279 | 865 | 754 | 556 | 367 | 175 | 16 | 44 | 73 | 154 | 139 | 135 | 86 | 82 | 54 | 48 | 51 | 31 | 28 | |
Swell 2 Height (m) Direction Period (s) | SW 8 | — | — | ENE 12 | ENE 12 | SSE 10 | SSE 10 | ENE 15 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 9 | SE 9 | SE 9 | SE 8 | SSE 9 | SSE 8 | SSE 8 |
59 | — | — | 14 | 13 | 10 | 10 | 21 | 16 | 16 | 27 | 48 | 45 | 41 | 20 | 19 | 18 | 7 | 7 | 7 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | SE 10 | E 16 | E 11 | ENE 15 | SSE 10 | NE 12 | NE 11 | NE 11 | NE 10 | — | — | — | — | NE 10 | N 9 | N 8 | N 9 |
— | — | — | 4 | 5 | 9 | 21 | 10 | 5 | 5 | 5 | 4 | — | — | — | — | 4 | 2 | 1 | 2 | |
Wind waves Height (m) Direction Period (s) | WNW 6 | WSW 6 | WSW 7 | WSW 7 | SW 8 | SW 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 9 | SW 10 | SW 10 | SW 9 | SW 9 | SW 9 |
180 | 320 | 639 | 846 | 1301 | 2059 | 2358 | 3279 | 2987 | 2602 | 1954 | 1382 | 1199 | 1131 | 904 | 1088 | 985 | 835 | 770 | 764 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 42 | 148 | 148 | 148 | 148 | 148 | 316 | 148 | 148 | 148 | 148 | 375 | 329 | 148 | 363 | 375 | 316 | 375 | 42 | 42 |
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
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.











