
Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 17 Jul 2026:
- Best quality surf: Monday 20 Jul, 8PM (local time) - 3.5ft (1.1m), 7s period, SW swell with cross-offshore winds.
- Most powerful swell: Friday 17 Jul, 11PM (local time) - 5ft (1.6m), 7s period, SW swell with 285 kJ wave energy.
- Next surfable swell (1★+): Monday 20 Jul, 8PM (local time) - 3.5ft (1.1m), 7s 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 (Jul 20) at 8PM. The primary swell is predicted to be 1.1m and 7s 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 1.6m 7s and forecast to arrive on Friday (Jul 17) at 11PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 10s period and expected on Friday (Jul 24) at 8AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Mon 20th Jul) | 3.5ft (1.1m) 7s |
| Best Surf | 8PM (Mon 20th Jul) | 3.5ft (1.1m) 7s |
| Most Powerful | 11PM (Fri 17th Jul) | 5ft (1.6m) 7s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, this is Rusty. Let's talk about what's on the menu for the next couple of weeks.
Right off the bat, I'll be straight with you – Nanwan Beach (South Bay) is looking at a pretty grim run of conditions. We've got a solid 16-day window here, but it's going to be a long wait for anything worthwhile. The first surf that's even worth mentioning doesn't show up until Saturday the 25th, so we're looking at a big gap of about a week with nothing good to report.
For the first few days, from the 17th all the way through the 24th, it's a washout. We're seeing a consistent SW swell around 5ft, but the wind is a mess. Cross-off breezes in the 15-18 mph range are just ruining any chance of clean waves. The combined energy is moderate (293), but it's all for nothing. The water temp is a warm 86°, which is about average for this time of year, so you can't blame the water.
Finally, on Saturday morning the 25th, we get a tiny glimmer of hope. The swell drops to 2ft from the SW, and the wind goes light and variable. The energy is weak (87), but it's the first time the conditions are described as "surfable waves but very ordinary conditions." It's not going to blow anyone's mind, but it's the best we've got. Then on Saturday afternoon, the wind goes glassy, but the swell is even smaller at 2ft. It's a classic case of "if you're desperate," but don't expect much.
Then we get another blank stretch. The next thing that pops up is a long-period ESE groundswell on the 26th and 27th, with a period of 13-16 seconds. The energy on the 27th morning is actually strong (371), but the wind is howling at 18 mph and the waves are tiny at 2ft. That's a shame, because that long period and strong energy would have been something special with clean conditions. As it stands, it's a no-go.
The last few days of the month and into August are more of the same: SW swell around 4-5ft, moderate energy around 200-350, but the wind is always blowing cross-off or cross-on, keeping it choppy and messy. The 1st of August has some size at 5ft, but the wind is 18-22 mph, which is just too much.
So, standouts? There aren't any true standouts here. The closest thing to a highlight is that Saturday the 25th with the light winds. It's a beach and reef setup, fairly consistent, and it's exposed to the SE swell. The crowds are often there, so you might have some company. But with tiny waves and only fair conditions, it's a "last resort" kind of day.
The rest of the period is a write-off. If you're a kitesurfer, the 5ft+ SW swell with those cross-off winds might be interesting, but for paddle surfing, it's a tough outlook. The forecast can always change, but for now, I'd be looking at other plans.
Rusty.
Short Range ForecastHeavy rain (total 22mm), heaviest during Sun afternoon. Warm (max 29°C on Fri morning, min 27°C on Sun night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Mon morning. Warm (max 30°C on Wed afternoon, min 28°C on Mon morning). Mainly fresh winds. | ||||||||||||||||||||
Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | |||||||||||||||
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 8 | SW 8 | SW 7 | SW 8 | SW 8 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 8 |
Wave Graph | |||||||||||||||||||||
270 | 250 | 262 | 255 | 223 | 188 | 183 | 183 | 248 | 135 | 113 | 89 | 97 | 82 | 55 | 64 | 59 | 47 | 43 | 51 | 55 | |
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 | cross | cross | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | glassy |
High Tide | 8:31AM1.30m | 9:51PM0.60m | 9:17AM1.17m | 10:28PM0.66m | 10:01AM1.01m | 11:08PM0.73m | 10:46AM0.84m | 11:52PM0.80m | 11:37AM0.68m | 00:40AM0.86m | 12:53PM0.55m | 1:33AM0.92m | 3:19PM0.48m | 2:28AM0.96m | |||||||
Low Tide | 3:58PM0.09m | 2:21AM0.36m | 4:31PM0.18m | 3:23AM0.39m | 4:57PM0.27m | 4:34AM0.43m | 5:18PM0.34m | 6:03AM0.46m | 5:34PM0.40m | 7:58AM0.44m | 5:44PM0.44m | 9:54AM0.38m | 5:47PM0.47m | ||||||||
5:22 | — | — | 5:22 | — | — | 5:22 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | |
— | 6:42 | — | — | 6:42 | — | — | 6:42 | — | — | 6:42 | — | — | 6:40 | — | — | 6:40 | — | — | 6:40 | — | |
mm | 3 | 2 | 2 | — | — | — | — | 10 | 5 | 6 | — | 1 | 1 | — | — | — | — | — | — | — | — |
Temp °C | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 29 | 28 | 29 | 29 | 28 | 29 | 30 | 29 | 29 | 29 | 29 |
Feels °C | 31 | 30 | 30 | 30 | 29 | 31 | 29 | 28 | 29 | 29 | 29 | 31 | 31 | 30 | 31 | 33 | 32 | 33 | 33 | 31 | 34 |
Swell 1 Height (m) Direction Period (s) | E 9 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | SW 7 | E 10 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 8 |
23 | 29 | 30 | 17 | 17 | 16 | 17 | 17 | 248 | 17 | 113 | 89 | 97 | 82 | 55 | 64 | 59 | 47 | 43 | 51 | 55 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | E 13 | E 13 | SE 9 | ESE 9 | E 10 | ESE 9 | E 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 11 |
— | — | — | — | 3 | 3 | 3 | 8 | 7 | 8 | 17 | 18 | 18 | 10 | 18 | 17 | 17 | 17 | 16 | 16 | 12 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | E 13 | — | E 13 | E 13 | ESE 9 | S 6 | ESE 9 | ESE 8 | ESE 8 | E 9 | SE 8 | SE 8 | SE 8 | NE 13 | E 10 | E 10 | ENE 9 |
— | — | — | — | 3 | — | 3 | 3 | 7 | 1 | 8 | 7 | 7 | 7 | 2 | 2 | 2 | 7 | 8 | 8 | 16 | |
Wind waves Height (m) Direction Period (s) | SW 8 | SW 8 | SW 7 | SW 8 | SW 8 | SW 7 | SW 7 | SW 7 | — | SW 7 | — | — | — | — | W 6 | — | — | — | — | WSW 2 | — |
270 | 250 | 262 | 255 | 223 | 188 | 183 | 183 | — | 135 | — | — | — | — | 3 | — | — | — | — | 1 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 693 | 996 | 348 | 861 | 348 | 348 | 843 | 859 | 14 | 922 | 922 | 2 | 14 | 14 | 2 | 2 | 838 | 2 | 2 | 2 | 2 |
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.










