
Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 5 Jul 2026:
- Best quality surf: Thursday 9 Jul, 2AM (local time) - 11ft (3.5m), 18s period, ESE swell with offshore winds.
- Most powerful swell: Friday 10 Jul, 2PM (local time) - 18ft (5.5m), 17s period, E swell with 17,459 kJ wave energy.
- Next surfable swell (1★+): Wednesday 8 Jul, 2AM (local time) - 4.5ft (1.3m), 16s period with ESE 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 (Jul 08) at 2AM. The primary swell is predicted to be 1.3m and 16s period with a secondary swell of 0.8m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Nanwan Beach (South Bay) in the next 16 days are 5.5m 17s and forecast to arrive on Friday (Jul 10) at 2PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 6.0m 10s period and expected on Saturday (Jul 11) at 5AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Wed 8th Jul) | 4.5ft (1.3m) 16s |
| Best Surf | 2AM (Thu 9th Jul) | 11ft (3.5m) 18s |
| Most Powerful | 2PM (Fri 10th Jul) | 18ft (5.5m) 17s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
Updates in hr min s Forecast update imminent
Alright, this is Rusty comin' at ya from Nanwan Beach (South Bay) – and I gotta be straight with ya, it's lookin' like a slow start. We've got a bit of a wait on our hands before any real action shows up.
The first half of this week is pretty flat. The wind's all wrong, the swell is tiny and weak, and the combo energy is barely registering. It's a write-off for a paddle.
Then, out of nowhere, Wednesday morning (8th July) things flip. We've got a clean 7ft swell rollin' in from the east with a solid 19-second period. That's proper groundswell energy, and with a light cross-offshore breeze, the lineup is gonna look smooth. The combined energy jumps to 3273 – that's got some real weight behind it. This is a standout for the forecast, but it's already gettin' big. That swell builds fast.
By Wednesday afternoon, we're lookin' at a thumping 10ft east-southeast swell at 19 seconds. The energy is up to 5804. The wind stays cross-off, so the face will be clean, but this is now a big-wave session. This ain't for beginners – this is for the crew who can handle a heavy, long-period groundswell. The water is warm at 86°, which is just about normal for this time of year.
The standout window is Wednesday 8th July. That morning session is the sweet spot before it gets too serious. If you're experienced, Thursday morning (9th July) is also incredible – 13ft of east swell with a clean offshore wind from the NNW. But I have to warn you, the forecast says it's predicted to be too big for this break. The energy is at 8890; we're talking a proper pulse. You'd need to know the spot inside out, and a reef setup might handle it better.
Thursday afternoon brings a perfect offshore breeze (NNW, 15 km/h) with the same 13ft swell. It'll be glassy, but again, it's a beast.
Friday (10th July) is even bigger, with a 16ft to 18ft east swell. The energy values are over 15,000 – that's massive. The winds are off or cross-off, so the conditions are clean, but the size is plain dangerous for anyone not at the top level of big-wave surfing. It's a "for experts only" kind of day.
Then from Saturday 11th July onward, the wheels fall off. A storm hits. We're talkin' 62 mph winds from the west, risk of thunderstorms, heavy rain. The swell direction flips to the southwest and the period drops to 9-10 seconds. The sea state becomes a total mess: cross-onshore, lumpy, choppy. The energy stays high, but it's all wind-affected junk. This is kite-surfing territory, not for a surfboard.
The rest of the second week is a write-off. Consistent stormy onshore flow from the south and southwest, dropping swell, and the combined energy fades to under 1000 by the 20th. There's nothing else worth a paddle.
So, the headline: Wednesday 8th July morning is the best bet. Get it while it's clean and before it gets too big. After that, it's either for hardcore chargers only, or a complete mess. No other real standouts in the 16-day window.
That's the picture from here.
Rusty
Short Range ForecastMostly dry. Warm (max 29°C on Sun afternoon, min 27°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 29mm), heaviest during Sat morning. Warm (max 30°C on Fri afternoon, min 27°C on Sat morning). Mainly stormy winds. | ||||||||||||||||||||
Sun 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | SW 9 | SW 9 | SW 8 | SW 8 | E 16 | ESE 15 | E 15 | ESE 16 | E 19 | ESE 19 | ESE 18 | E 18 | ESE 18 | E 18 | E 18 | E 17 | ENE 16 | WSW 10 | SW 9 | SW 10 | SW 10 |
Wave Graph | |||||||||||||||||||||
206 | 152 | 112 | 95 | 193 | 360 | 619 | 849 | 3201 | 5743 | 6893 | 8809 | 10824 | 13241 | 16095 | 15755 | 0 | 5575 | 4037 | 3783 | 2614 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | cross-on | on | on | glassy | cross-off | cross-off | off | cross-off | off | off | cross-off | off | cross-off | cross-off | cross | cross-on | cross-on |
High Tide | 11:03PM0.63m | 10:15AM0.96m | 11:47PM0.71m | 11:08AM0.84m | 00:35AM0.79m | 12:21PM0.72m | 1:27AM0.90m | 2:01PM0.61m | 2:21AM1.01m | 3:54PM0.55m | 3:17AM1.13m | 5:27PM0.54m | 4:13AM1.24m | ||||||||
Low Tide | 4:55PM0.23m | 3:38AM0.46m | 5:25PM0.27m | 4:58AM0.47m | 5:56PM0.32m | 6:39AM0.45m | 6:30PM0.37m | 8:27AM0.38m | 7:08PM0.41m | 9:59AM0.26m | 7:53PM0.45m | 11:11AM0.13m | 8:45PM0.46m | 12:10PM0.02m | |||||||
— | — | 5:18 | — | — | 5:18 | — | — | 5:18 | — | — | 5:18 | — | — | 5:20 | — | — | 5:20 | — | — | 5:20 | |
6:44 | — | — | 6:44 | — | — | 6:44 | — | — | 6:44 | — | — | 6:44 | — | — | 6:44 | — | — | 6:44 | — | 6:43 | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 28 | 30 | 20 | 5 |
Temp °C | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 29 | 28 | 29 | 29 | 29 |
Feels °C | 31 | 31 | 32 | 32 | 33 | 32 | 32 | 33 | 32 | 31 | 31 | 30 | 30 | 32 | 29 | 34 | 34 | 16 | 21 | 24 | 29 |
Swell 1 Height (m) Direction Period (s) | SW 9 | SW 9 | SW 8 | SW 8 | SW 8 | ESE 15 | E 15 | ESE 16 | E 19 | ESE 19 | ESE 18 | E 18 | ESE 18 | E 18 | E 18 | E 17 | ENE 16 | NE 13 | NE 12 | SE 11 | SE 10 |
206 | 152 | 112 | 95 | 91 | 360 | 619 | 849 | 3201 | 5743 | 6893 | 8809 | 10824 | 13241 | 16095 | 15755 | 10436 | 1589 | 118 | 145 | 180 | |
Swell 2 Height (m) Direction Period (s) | E 9 | E 9 | E 9 | E 9 | E 16 | SW 8 | SW 8 | WSW 8 | WSW 8 | WSW 7 | WSW 7 | — | — | — | WSW 8 | WSW 8 | — | SE 13 | SE 12 | ENE 10 | E 9 |
36 | 39 | 39 | 24 | 193 | 91 | 84 | 72 | 72 | 61 | 52 | — | — | — | 43 | 39 | — | 27 | 53 | 20 | 14 | |
Swell 3 Height (m) Direction Period (s) | ESE 8 | SE 10 | ESE 9 | ESE 18 | E 9 | E 9 | E 9 | E 20 | — | — | — | — | — | — | — | — | — | — | SE 12 | NE 13 | — |
7 | 4 | 7 | 64 | 24 | 39 | 23 | 196 | — | — | — | — | — | — | — | — | — | — | 51 | 7 | — | |
Wind waves Height (m) Direction Period (s) | SE 4 | SSE 4 | SE 4 | SSE 4 | SE 3 | — | — | — | — | — | — | W 7 | — | — | NW 6 | NW 7 | WNW 8 | WSW 10 | SW 9 | SW 10 | SW 10 |
5 | 4 | 2 | 2 | 4 | — | — | — | — | — | — | 81 | — | — | 150 | 342 | 2188 | 5575 | 4037 | 3783 | 2614 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 451 | 14 | 148 | 14 | 42 | 14 | 14 | 0 | 0 | 0 | 2 | 2 | 2 | 2 | 535 | 676 | 390 | 148 | 541 | 1253 | 1259 |
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.











