Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 19 Jul 2026:
- Best quality surf: Sunday 19 Jul, 11PM (local time) - 4ft (1.2m), 7s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 19 Jul, 11AM (local time) - 5ft (1.6m), 7s period, WSW swell with 236 kJ wave energy.
- Next surfable swell (1★+): Sunday 19 Jul, 11PM (local time) - 4ft (1.2m), 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 Sunday (Jul 19) at 11PM. The primary swell is predicted to be 1.2m 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 1.6m 7s and forecast to arrive on Sunday (Jul 19) at 11AM. 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+) | 11PM (Sun 19th Jul) | 4ft (1.2m) 7s |
| Best Surf | 11PM (Sun 19th Jul) | 4ft (1.2m) 7s |
| Most Powerful | 11AM (Sun 19th Jul) | 5ft (1.6m) 7s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright folks, it’s Rusty here. Let’s have a look at the next 16 days for Nanwan Beach (South Bay). Gotta be straight with you – this outlook is a tough one. The whole 16-day window is a write-off for any decent surf. There isn’t a single recommendation in the entire forecast. That’s a long, dry stretch, and for this area, a blank run like this isn’t that unusual.
We’re starting off on Sunday the 19th of July with some background swell from the WSW pushing around 5ft to 5ft, but the energy is weak (260) and the period is a short, choppy 7 seconds. That’s not doing us any favours. The wind is a fresh cross-offshore, which keeps the surface clean, but the wave quality is just poor. There’s no shape to it.
This pattern barely changes for the rest of the month. Monday the 20th through to the end of July sees the swell dropping and staying small, never getting above 4ft, and the period stays glued to 7 seconds. The combined energy is pathetic, dropping from 145 down to single digits. The water temp is a warm 86°, which is about 1° above the norm, so it’s nothing unusual, just average for this time of year. The winds are mostly cross-off from the west, keeping things clean, but there’s just no oomph in the water. It’s a long, flat, frustrating wait.
We get a glimmer of something different right at the end of the run. On Friday the 31st of July, a new pulse of swell shows up, pushing 7ft to 7ft from the SSW with moderate energy (528). But the period is still a short, fat 7 to 8 seconds, and with the wind still a fresh cross-offshore, it’s just going to be a messy, crumbly wall. Not worth the paddle. Then from Saturday the 1st of August, the E windswell starts to build with a very long period of 17 seconds and strong energy (over 312). That sounds promising, but the swell height is tiny (2ft to 3ft). A long period groundswell that small just won’t have the push to break properly at a beach and reef setup like this. It’ll be a lot of rolling lines with very little to ride. The winds are also a strong to near-gale force from the WNW, which is clean but makes paddling out a battle.
So, the bottom line: there’s no standout, no hidden gem, not even a session worth mentioning. The forecast is a total dud. It’s a waiting game, boys. Keep your boards waxed, but don’t hold your breath. Things can change, but right now, this is a solid 16-day gap of nothing.
Rusty.
Short Range ForecastLight rain (total 8mm), mostly falling on Mon morning. Warm (max 29°C on Mon morning, min 27°C on Sun morning). Winds decreasing (fresh winds from the W on Sun afternoon, light winds from the W by Mon night). | Days 4-6 Weather SummaryMostly dry. Warm (max 29°C on Wed morning, min 27°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | |||||||||||||||
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) | WSW 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 | ESE 11 | SE 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 236 | 178 | 119 | 119 | 116 | 105 | 115 | 102 | 60 | 62 | 62 | 48 | 52 | 54 | 34 | 34 | 33 | 18 | 18 | 23 | 27 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | on | on | cross-on | cross | glassy | cross | cross-off |
High Tide | 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 | 4:12AM1.07m | |||||||||
Low Tide | 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 | 11:49AM0.23m | ||||||||||
 |  |  | | |  | |  |  | | | | | | | | | | | | | |
 | 5:22 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:26 | — | — |
 | — | 6:42 | — | — | 6:42 | — | — | 6:40 | — | — | 6:40 | — | — | 6:40 | — | — | 6:39 | — | — | 6:39 | — |
mm | 1 | — | 1 | 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 27 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 29 | 29 | 28 |
Feels °C | 28 | 26 | 31 | 31 | 30 | 32 | 32 | 30 | 33 | 32 | 31 | 33 | 32 | 32 | 34 | 32 | 31 | 30 | 34 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | E 10 | E 10 | E 10 | E 10 | SW 7 | ENE 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 |
| kJ | 17 | 17 | 17 | 17 | 116 | 18 | 115 | 102 | 60 | 62 | 62 | 48 | 52 | 54 | 34 | 34 | 33 | 18 | 18 | 18 | 17 |
Swell 2 Height (m) Direction Period (s) | SE 10 | ESE 9 | ESE 8 | ESE 9 | ENE 10 | ESE 8 | E 10 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 10 | ENE 10 | ENE 10 | NE 10 | NE 10 | NE 10 |
| kJ | 4 | 7 | 7 | 8 | 19 | 7 | 16 | 18 | 18 | 17 | 17 | 17 | 16 | 16 | 16 | 22 | 42 | 38 | 25 | 24 | 24 |
Swell 3 Height (m) Direction Period (s) | E 13 | E 13 | E 12 | S 6 | ESE 9 | E 13 | ESE 8 | ESE 8 | SSE 4 | SSE 4 | SSE 4 | — | E 10 | E 10 | ENE 12 | ESE 10 | ESE 10 | ESE 10 | SE 4 | ESE 11 | SE 10 |
| kJ | 3 | 3 | 3 | 1 | 8 | 3 | 7 | 6 | 2 | 2 | 1 | — | 8 | 8 | 13 | 10 | 10 | 9 | 4 | 23 | 27 |
Wind waves Height (m) Direction Period (s) | WSW 7 | SW 7 | SW 7 | SW 7 | — | SW 7 | — | — | — | — | — | — | SSE 3 | — | — | — | — | ESE 3 | — | ESE 4 | E 3 |
| kJ | 236 | 178 | 119 | 119 | — | 105 | — | — | — | — | — | — | 1 | — | — | — | — | 5 | — | 4 | 5 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 843 | 888 | 2 | 14 | 922 | 0 | 14 | 14 | 2 | 2 | 14 | 2 | 2 | 2 | 329 | 694 | 42 | 79 | 42 | 694 | 693 |
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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