Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 18 Jul 2026:
- Best quality surf: Monday 20 Jul, 8PM (local time) - 3.5ft (1.0m), 7s period, SW swell with cross-offshore winds.
- Most powerful swell: Saturday 18 Jul, 5PM (local time) - 5ft (1.5m), 7s period, SW swell with 231 kJ wave energy.
- Next surfable swell (1★+): Monday 20 Jul, 8PM (local time) - 3.5ft (1.0m), 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 1.0m and 7s 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 1.5m 7s and forecast to arrive on Saturday (Jul 18) at 5PM. 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 5PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Mon 20th Jul) | 3.5ft (1.0m) 7s |
| Best Surf | 8PM (Mon 20th Jul) | 3.5ft (1.0m) 7s |
| Most Powerful | 5PM (Sat 18th Jul) | 5ft (1.5m) 7s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Right, look, I gotta be straight with you – the forecast for Nanwan Beach (South Bay) is mostly a frustrating story. The first week and a half or so is a dead loss. The whole stretch from Saturday the 18th right through to Tuesday the 28th of July is just a waste of time. The swell is tiny, the wind is constantly cross-off or cross, and it's all labelled as "poor surf conditions." Honestly, don't even bother paddling out. The water temp is bang on average for the time of year at 86°, so that's not the issue, it's just a total lack of any decent push.
The combined swell energy is a joke, barely cracking 200 for most of that period, and often sitting in the double digits. It's a textbook dry spell. A blank run like this is pretty normal for the area when the trades are relentless.
Now, there is a glimmer of hope right at the tail end of the forecast. On Monday the 27th of July, the afternoon shows a spike of long-period swell from the East with a 15-second period, and the combined energy jumps to 202 – that's at least moderate. The wind goes glassy, which is a massive plus. The problem is the swell height is only 2ft, so it's barely surfable.
The real standout, if you can call it that, is Tuesday the 28th of July. Morning and afternoon both see a solid 4ft to 5ft swell from the East, with a very long 15–16 second period. The combined energy gets into the 900s, which is strong energy. The wind is cross-off from the WNW, so it'll be clean. Now, here's the caveat: that's a long-period groundswell. At a beach and reef setup, it can break a bit too straight and be tricky. But if you're an intermediate who can handle a bit of a wait for the sets, that Tuesday morning is the best on offer. The short period, 6-second junk that shows up on the 1st of August is just messy, with strong winds making it look more interesting for kite surfing than paddle surfing.
So, to sum it up: the first 10 days are a write-off. The only real window is around Tuesday the 28th, with a decent, clean, long-period East swell. It's a long way out, so treat it as promising but not guaranteed. Keep an eye on it.
Rusty.
Short Range ForecastModerate rain (total 14mm), heaviest on Sat morning. Warm (max 29°C on Sat morning, min 27°C on Sun night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Tue morning. Warm (max 29°C on Tue morning, min 28°C on Tue morning). Wind will be generally light. | ||||||||||||||||||||
Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | |||||||||||||||
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 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 7 | SW 7 | SW 7 | SW 7 | SW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 244 | 231 | 169 | 194 | 167 | 121 | 105 | 119 | 91 | 91 | 121 | 73 | 64 | 51 | 47 | 52 | 33 | 34 | 34 | 33 | 17 |
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-off | cross | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | glassy | cross-off | cross-off | cross |
High Tide | 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 | 3:22AM1.01m | ||||||||
Low Tide | 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 | 11:05AM0.30m | |||||||||
 | |  | |  |  | | |  | |  | | | |  | | | | | | | |
 | 5:22 | — | — | 5:22 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — |
 | — | 6:42 | — | — | 6:42 | — | — | 6:42 | — | — | 6:40 | — | — | 6:40 | — | — | 6:40 | — | — | 6:39 | — |
mm | 3 | 1 | 4 | 1 | — | 2 | 1 | 2 | — | 3 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 28 |
Feels °C | 30 | 29 | 29 | 30 | 30 | 29 | 30 | 30 | 33 | 32 | 31 | 32 | 33 | 31 | 32 | 32 | 31 | 34 | 33 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | E 10 | E 10 | E 10 | E 10 | 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 7 | SW 7 |
| kJ | 17 | 17 | 16 | 17 | 167 | 121 | 105 | 119 | 91 | 91 | 121 | 73 | 64 | 51 | 47 | 52 | 33 | 34 | 34 | 33 | 17 |
Swell 2 Height (m) Direction Period (s) | — | E 13 | E 13 | SE 9 | E 10 | E 10 | E 10 | E 10 | ENE 10 | E 10 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 10 | ENE 10 | ENE 10 |
| kJ | — | 3 | 3 | 3 | 17 | 17 | 17 | 17 | 18 | 17 | 9 | 18 | 18 | 17 | 17 | 16 | 16 | 16 | 21 | 41 | 38 |
Swell 3 Height (m) Direction Period (s) | — | — | — | E 13 | ESE 9 | ESE 8 | ESE 9 | ESE 9 | ESE 8 | ESE 8 | ESE 8 | SSE 4 | SE 4 | E 9 | SE 8 | E 10 | E 10 | ENE 11 | E 10 | ESE 10 | ESE 10 |
| kJ | — | — | — | 3 | 7 | 7 | 8 | 8 | 7 | 7 | 6 | 2 | 1 | 7 | 2 | 8 | 8 | 13 | 7 | 10 | 9 |
Wind waves Height (m) Direction Period (s) | SW 8 | SW 7 | SW 7 | SW 7 | — | — | — | — | — | — | — | — | — | WSW 2 | — | — | — | — | — | — | SE 4 |
| kJ | 244 | 231 | 169 | 194 | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 937 | 937 | 348 | 2 | 922 | 14 | 922 | 14 | 14 | 14 | 14 | 2 | 2 | 14 | 2 | 2 | 2 | 2 | 2 | 2 | 79 |
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.
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