
Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 19 Jul 2026:
- Best quality surf: Monday 20 Jul, 11PM (local time) - 3.5ft (1.0m), 7s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 26 Jul, 8PM (local time) - 2.5ft (0.7m), 14s period, ESE swell with 186 kJ wave energy.
- Next surfable swell (1★+): Monday 20 Jul, 11PM (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 11PM. The primary swell is predicted to be 1.0m and 7s period with a secondary swell of 0.2m and 8s. 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 0.7m 14s and forecast to arrive on Sunday (Jul 26) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 5s period and expected on Sunday (Jul 26) at 11AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Mon 20th Jul) | 3.5ft (1.0m) 7s |
| Best Surf | 11PM (Mon 20th Jul) | 3.5ft (1.0m) 7s |
| Most Powerful | 8PM (Sun 26th Jul) | 2.5ft (0.7m) 14s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s talk about Nanwan Beach (South Bay).
We’ve got a long quiet spell ahead. From now through the 26th of July, it’s pretty much flat or tiny, weak windswell with crummy conditions. The water’s sitting at about 85°, which is pretty normal for this time of year – nothing unusual there. But don’t bother paddling out, because the surf is poor and the energy is barely there (values like 29 to 141). You’ll be waiting.
Then, on Monday the 27th of July, things wake up in a big way. The morning brings a solid 6 ft ESE groundswell with a 13-second period, delivering proper energy (1204) and clean conditions thanks to a light cross-off breeze from the WNW at 6 mph. That’s already a good session. But the real standout is the afternoon of the 27th: the swell bumps up to 7 ft from the ESE, the period stretches to a very long 15 seconds, and the wind goes glassy – dead calm, off the north. The energy jumps to 1985, and the guidance says “excellent surf for experienced surfers.” That’s the one to circle. The direction is pretty much optimum for the break, and the long period will make for some beautiful, powerful lines – though keep in mind that kind of period can make beach breaks a bit tricky, but Nanwan is a beach and reef setup, so it should handle it well. Expect crowds because it’s often busy.
Tuesday the 28th of July still has solid swell: 8 ft from the E in the morning, period 14s, energy 2249, and clean cross-off wind from the west at 16 mph. That’s a bit more size, so it’s for strong intermediates and up. The afternoon drops slightly to 7 ft, still good. But the wind is a bit stronger, so the glassy perfection of Monday afternoon is the real highlight.
After Tuesday, it’s back to poor surf – strong winds, messy onshores, and the swell drops off. From the 29th of July through the 3rd of August, it’s mostly blown-out and small, with energy down to 2–483, and the wind stays strong from the west. Not worth your time.
So, if you’re looking for the best window, it’s definitely Monday the 27th of July, especially the afternoon session. Tuesday the 28th is a solid backup but a notch down in quality. Get out there while it’s clean.
– Rusty
Short Range ForecastLight rain (total 7mm), mostly falling on Mon night. Warm (max 29°C on Mon morning, min 27°C on Sun night). Winds decreasing (fresh winds from the W on Sun afternoon, light winds from the WSW by Mon night). | Days 5-7 Weather SummaryMostly dry. Warm (max 30°C on Fri afternoon, min 27°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Sun 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | ||||||||||||||
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 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 10 |
Wave Graph | ||||||||||||||||||||
194 | 105 | 116 | 116 | 91 | 102 | 102 | 71 | 51 | 42 | 39 | 39 | 33 | 34 | 19 | 19 | 17 | 17 | 12 | 20 | |
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 | cross-off | cross-off | cross | cross-off | cross | cross-on | cross | cross-on | cross-on | cross | cross | cross | cross-off | cross-off |
High Tide | 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 | |||||||||
— | — | 5:24 | — | — | 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 | — | — | 2 | — | 3 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 28 | 29 | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 29 | 30 | 28 | 29 | 30 | 28 |
Feels °C | 27 | 31 | 32 | 30 | 31 | 32 | 31 | 33 | 33 | 32 | 34 | 32 | 32 | 32 | 30 | 31 | 30 | 32 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | E 10 | SW 7 | SW 7 | ENE 10 | ENE 10 | ENE 10 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | NE 10 | NE 10 | ENE 10 |
17 | 105 | 116 | 19 | 18 | 18 | 102 | 71 | 51 | 42 | 39 | 39 | 33 | 34 | 19 | 19 | 17 | 25 | 25 | 19 | |
Swell 2 Height (m) Direction Period (s) | ESE 9 | E 10 | E 10 | ESE 9 | ESE 8 | ESE 8 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 10 | NE 10 | NE 10 | SW 7 | SW 7 | SW 7 |
7 | 17 | 17 | 8 | 7 | 7 | 18 | 18 | 17 | 17 | 17 | 16 | 16 | 16 | 22 | 27 | 25 | 17 | 12 | 7 | |
Swell 3 Height (m) Direction Period (s) | E 13 | ESE 8 | ESE 9 | E 13 | E 12 | S 7 | ESE 8 | SE 8 | SE 4 | SSE 3 | SE 8 | E 10 | E 10 | ENE 12 | E 10 | E 10 | ESE 10 | ESE 11 | ESE 11 | ESE 10 |
3 | 7 | 8 | 3 | 3 | 1 | 6 | 3 | 1 | 1 | 2 | 8 | 8 | 13 | 7 | 8 | 9 | 12 | 11 | 20 | |
Wind waves Height (m) Direction Period (s) | SW 7 | — | — | SW 7 | SW 7 | SW 7 | — | — | SSE 3 | — | — | SSE 2 | — | SSE 4 | SE 4 | SE 4 | E 4 | E 4 | E 3 | ENE 4 |
194 | — | — | 116 | 91 | 102 | — | — | 1 | — | — | 1 | — | 2 | 3 | 6 | 10 | 8 | 5 | 22 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 863 | 14 | 14 | 922 | 0 | 14 | 861 | 2 | 2 | 2 | 451 | 451 | 2 | 693 | 79 | 1254 | 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.










