Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 26 Aug 2026:
- Best quality surf: Friday 28 Aug, 11PM (local time) - 6ft (1.9m), 9s period, SW swell with cross-offshore winds.
- Most powerful swell: Saturday 29 Aug, 2AM (local time) - 7ft (2.1m), 9s period, SW swell with 703 kJ wave energy.
- Next surfable swell (1★+): Friday 28 Aug, 11PM (local time) - 6ft (1.9m), 9s 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 Friday (Aug 28) at 11PM. The primary swell is predicted to be 1.9m and 9s 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 2.1m 9s and forecast to arrive on Saturday (Aug 29) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 14s period and expected on Wednesday (Sep 02) at 5AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Fri 28th Aug) | 6ft (1.9m) 9s |
| Best Surf | 11PM (Fri 28th Aug) | 6ft (1.9m) 9s |
| Most Powerful | 2AM (Sat 29th Aug) | 7ft (2.1m) 9s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, folks, Rusty here again. Let's break this down in feet and miles per hour, because not everyone thinks in meters.
First things first, the coming week is a bit of a mixed bag. We have a decent SW swell, but the wind is going to be a real problem for most of it. Water temp is a comfy 84°, right where it should be.
Starting Wednesday, the 26th, we're looking at waves around 6ft from the SW, but that 20 mph cross-off wind is messing with the surface. It's surfable, but nothing to get stoked about. The swell builds through the end of the week, hitting 7ft on Thursday with a short period, and the wind is howling at 20-25 mph. That's a choppy, blown-out mess.
By Friday the 28th, we still have 7ft of SW swell, and the wind backs off a little, but it's still a cross-off with a short period. It's a marginal day.
Now, Saturday the 29th is your best early bet. The wind drops to a light 6 mph from the SW, giving us a clean-ish cross-shore breeze on that 7ft swell. It's not perfect, but it's your best shot until the real winner shows up.
That winner? Tuesday the 1st of September. The swell drops to a very manageable 5ft from the SW, but the wind goes glassy. Dead calm in the afternoon. That's the day. Perfect conditions, clean waves. Circle the calendar.
After that, the swell fades fast. By the second week of September, we're down to 2-3ft junk with almost no energy. It looks like a flat spell starts around the 8th.
So, your play is Saturday the 29th for a so-so session, but the absolute must-surf day is the glassy Tuesday morning on the 1st of September. After that, hang up the board for a while.
Rusty.
Short Range ForecastModerate rain (total 14mm), heaviest on Fri night. Warm (max 29°C on Wed afternoon, min 28°C on Wed afternoon). Winds decreasing (fresh winds from the W on Thu afternoon, light winds from the SW by Fri night). | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Sun morning. Warm (max 29°C on Sat afternoon, min 27°C on Sun night). Winds increasing (light winds from the SSW on Sat afternoon, strong winds from the NE by Tue morning). | |||||||||||||||||||
Wed 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | ||||||||||||||
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 9 | SW 9 | SW 8 | SW 8 | SW 8 | SW 8 | SW 9 | SW 9 | SW 9 | SSW 9 | SW 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 9 | SW 10 | SW 10 | SW 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 598 | 585 | 582 | 530 | 505 | 555 | 554 | 703 | 657 | 553 | 491 | 587 | 650 | 535 | 486 | 407 | 343 | 452 | 441 | 424 |
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 | cross-on | cross-on | cross | cross | cross-off | cross-off | cross | cross | cross-off | cross-off | cross-off | cross-off |
High Tide | 6:49PM0.59m | 6:02AM1.17m | 7:06PM0.64m | 6:38AM1.18m | 7:26PM0.70m | 7:13AM1.14m | 7:49PM0.76m | 7:48AM1.08m | 8:14PM0.84m | 8:25AM0.98m | 8:42PM0.91m | 9:04AM0.86m | 9:15PM0.97m | |||||||
Low Tide | 11:07PM0.40m | 1:18PM0.14m | 11:51PM0.35m | 1:39PM0.15m | 00:35AM0.30m | 2:00PM0.18m | 1:18AM0.26m | 2:19PM0.22m | 2:05AM0.24m | 2:38PM0.27m | 2:55AM0.24m | 2:56PM0.32m | 3:54AM0.26m | |||||||
 |  | |  | | | | | |  |  | | | | | |  | | | | |
 | — | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — |
 | 6:19 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — |
mm | 2 | 4 | 1 | — | 2 | 1 | — | 4 | — | — | — | 1 | — | 1 | — | — | 1 | — | — | — |
Temp °C | 29 | 28 | 28 | 28 | 28 | 29 | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 28 | 28 | 29 | 28 |
Feels °C | 30 | 30 | 29 | 27 | 29 | 31 | 31 | 31 | 34 | 33 | 34 | 29 | 30 | 30 | 29 | 29 | 28 | 26 | 26 | 28 |
Swell 1 Height (m) Direction Period (s) | ENE 13 | NE 12 | NE 12 | NE 11 | ENE 13 | SW 8 | SW 9 | ENE 12 | SW 9 | SSW 9 | SW 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 9 | SW 10 | SW 10 | ENE 13 |
| kJ | 469 | 149 | 108 | 58 | 58 | 555 | 554 | 28 | 657 | 553 | 491 | 587 | 650 | 535 | 486 | 407 | 343 | 452 | 441 | 1060 |
Swell 2 Height (m) Direction Period (s) | ESE 11 | E 11 | ENE 14 | ENE 13 | NE 10 | ENE 13 | ENE 12 | SE 10 | ENE 12 | ENE 12 | ENE 13 | ENE 13 | E 10 | E 9 | E 10 | E 10 | E 10 | ENE 10 | ENE 11 | SW 10 |
| kJ | 12 | 21 | 39 | 35 | 27 | 55 | 51 | 4 | 28 | 27 | 59 | 58 | 94 | 111 | 156 | 259 | 264 | 260 | 469 | 424 |
Swell 3 Height (m) Direction Period (s) | — | ESE 10 | ENE 11 | E 9 | ESE 10 | NNE 10 | SE 10 | E 8 | ENE 15 | ENE 15 | ENE 7 | SSE 7 | ENE 13 | ENE 12 | ENE 12 | SSE 9 | SE 8 | SSE 10 | SSE 9 | WSW 9 |
| kJ | — | 11 | 22 | 7 | 10 | 10 | 4 | 1 | 21 | 21 | 10 | 5 | 55 | 49 | 45 | 8 | 3 | 9 | 8 | 75 |
Wind waves Height (m) Direction Period (s) | SW 9 | SW 9 | SW 8 | SW 8 | SW 8 | — | — | SW 9 | — | — | — | ENE 9 | ENE 4 | NE 3 | ENE 4 | ENE 3 | ENE 4 | — | — | — |
| kJ | 598 | 585 | 582 | 530 | 505 | — | — | 703 | — | — | — | 88 | 5 | 5 | 9 | 5 | 9 | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 316 | 148 | 335 | 148 | 42 | 363 | 42 | 2 | 14 | 14 | 316 | 693 | 451 | 535 | 693 | 693 | 335 | 442 | 442 | 0 |
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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