Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 10 Sep 2026:
- Best quality surf: Monday 14 Sep, 2AM (local time) - 3.5ft (1.0m), 8s period, SW swell with offshore winds.
- Most powerful swell: Wednesday 16 Sep, 5PM (local time) - 3.5ft (1.0m), 10s period, SW swell with 196 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 2AM (local time) - 3.5ft (1.0m), 8s 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 (Sep 14) at 2AM. The primary swell is predicted to be 1.0m and 8s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Nanwan Beach (South Bay) in the next 16 days are 1.0m 10s and forecast to arrive on Wednesday (Sep 16) 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 3.0m 8s period and expected on Friday (Sep 11) at 2AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Mon 14th Sep) | 3.5ft (1.0m) 8s |
| Best Surf | 2AM (Mon 14th Sep) | 3.5ft (1.0m) 8s |
| Most Powerful | 5PM (Wed 16th Sep) | 3.5ft (1.0m) 10s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s be straight with you: the next week and a half is pretty grim for a paddle. Things finally kick into gear around the 19th, so we’ve got a solid stretch of flat, poor conditions before that.
We’re looking at Nanwan Beach (South Bay) as the main option. From now until Friday the 19th, it’s a write-off. Tiny waves, mostly under 1 ft, messy winds, and a lot of risk of thunderstorms. The combined swell energy is weak, barely cracking 30–40 (31) most days. It’s not worth a second look.
Then, Saturday the 19th morning, we see a jump to 6 ft from the east with a 16-second period, and the energy climbs to 1555 (moderate). The wind is a gentle breeze from the NNE, cross-off, so it’ll be clean. This is the first real glimmer. By Saturday afternoon, the swell hits 7 ft, period stretching to 19 seconds, and energy is 2735 (strong). That’s groundswell, long lines, and it’s going to be a proper push. The wind is still light and cross-off. This is a standout for experienced surfers only—7 ft+ is expert territory. The east swell is a good match for the optimum direction here (SE), so the break should handle it well.
But the true standout is Sunday the 20th morning. Glassy conditions, no wind to speak of (ESE 5 km/h, glassy), and the swell is 8 ft from the east with a 17-second period. The energy is massive at 3061 (very strong). This is the pick of the entire forecast. It’s big, clean, and powerful. Again, strictly for experienced surfers. Crowds are likely here, so get in early.
After Sunday afternoon, it drops off quickly—1.0 ft and back to junk. Monday the 21st has a bit of a rebound (4 ft, 11-second period, energy 283), but it’s only a marginal call, not a standout. Then from Tuesday the 22nd through to the end of the window, it’s back to tiny, poor surf with cross-shore wind and weak energy. The very last day, Saturday the 26th, shows 5 ft from the east at 14 seconds, energy 894, but it’s still only a marginal call with moderate breeze.
So, in short: wait until the 19th. Saturday the 19th afternoon and Sunday the 20th morning are your best shots. Big, clean, long-period east swell. Don’t bother before that.
Rusty.
Short Range ForecastLight rain (total 8mm), mostly falling on Fri afternoon. Warm (max 29°C on Sat morning, min 27°C on Thu night). Mainly strong winds. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Mon night. Warm (max 29°C on Mon morning, min 27°C on Sun night). Mainly fresh winds. | ||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | ||||||||||||||
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) | E 17 | E 16 | E 16 | ESE 9 | SSW 8 | SSW 8 | SSW 7 | SSW 8 | SSW 8 | SW 8 | SW 8 | SW 8 | SW 9 | SW 9 | WSW 11 | SW 9 | SW 10 | SW 10 | SW 10 |
Wave Graph  | |||||||||||||||||||
 kJ | 23 | 21 | 21 | 8 | 6 | 22 | 47 | 106 | 109 | 138 | 112 | 75 | 152 | 126 | 75 | 144 | 157 | 196 | 137 |
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 | cross-off | cross-off | cross-off | cross-off | off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 6:37AM1.19m | 7:14PM0.79m | 7:18AM1.10m | 7:38PM0.87m | 7:56AM0.99m | 8:04PM0.95m | 8:33AM0.86m | 8:31PM1.00m | 9:09AM0.73m | 8:59PM1.02m | 9:45AM0.61m | 9:30PM1.02m | |||||||
Low Tide | 11:59PM0.28m | 1:24PM0.15m | 00:48AM0.23m | 1:45PM0.21m | 1:36AM0.20m | 2:02PM0.28m | 2:23AM0.20m | 2:15PM0.33m | 3:11AM0.23m | 2:24PM0.38m | 4:03AM0.27m | 2:28PM0.41m | |||||||
 |  |  |  | | |  |  | | | | | | | | | | | | |
 | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — |
 | 6:05 | — | 6:04 | — | — | 6:02 | — | — | 6:01 | — | — | 6:00 | — | — | 6:00 | — | — | 5:59 | — |
mm | — | — | 1 | 3 | 2 | 2 | — | — | — | — | — | 1 | 2 | 2 | — | — | — | 2 | — |
Temp °C | 27 | 28 | 28 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 27 | 29 | 29 | 27 | 29 | 29 | 27 |
Feels °C | 24 | 26 | 27 | 27 | 28 | 29 | 29 | 30 | 30 | 30 | 30 | 32 | 29 | 31 | 31 | 28 | 29 | 28 | 26 |
Swell 1 Height (m) Direction Period (s) | SW 8 | E 16 | E 16 | ENE 15 | ENE 15 | SSW 8 | SSW 7 | SSW 8 | SSW 8 | SW 8 | ENE 6 | ENE 7 | SW 9 | SW 9 | SW 8 | SW 9 | ENE 9 | SW 10 | SW 10 |
| kJ | 9 | 21 | 21 | 44 | 74 | 22 | 47 | 106 | 109 | 138 | 68 | 77 | 152 | 126 | 68 | 144 | 153 | 196 | 137 |
Swell 2 Height (m) Direction Period (s) | ESE 10 | ESE 9 | SSW 9 | NW 7 | SSW 8 | ENE 15 | E 14 | E 14 | E 14 | E 14 | SW 8 | SW 8 | E 13 | E 13 | WSW 11 | ENE 13 | SW 10 | E 12 | ENE 10 |
| kJ | 9 | 8 | 7 | 8 | 6 | 74 | 100 | 103 | 98 | 101 | 112 | 75 | 90 | 87 | 75 | 55 | 157 | 71 | 136 |
Swell 3 Height (m) Direction Period (s) | E 17 | SW 8 | ESE 9 | ESE 9 | NNW 6 | ESE 10 | SE 5 | ESE 10 | ESE 10 | E 10 | E 14 | E 13 | SW 10 | E 13 | E 13 | N 8 | E 12 | ENE 16 | ENE 15 |
| kJ | 23 | 2 | 8 | 8 | 3 | 10 | 7 | 9 | 9 | 16 | 100 | 92 | 52 | 125 | 86 | 1 | 72 | 24 | 44 |
Wind waves Height (m) Direction Period (s) | NE 8 | NE 8 | NE 7 | NE 7 | ENE 5 | NE 5 | ENE 5 | ENE 5 | ENE 5 | ENE 5 | NW 3 | NE 6 | ENE 6 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | NE 5 |
| kJ | 932 | 780 | 704 | 370 | 106 | 70 | 40 | 45 | 39 | 78 | 4 | 120 | 196 | 208 | 292 | 274 | 288 | 313 | 58 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 329 | 451 | 511 | 316 | 449 | 676 | 316 | 451 | 451 | 0 | 348 | 2 | 348 | 442 | 451 | 0 | 494 | 497 | 316 |
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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