Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 5 Sep 2026:
- Best quality surf: Sunday 6 Sep, 2PM (local time) - 4ft (1.2m), 8s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 6 Sep, 8AM (local time) - 4.5ft (1.3m), 8s period, WSW swell with 198 kJ wave energy.
- Next surfable swell (1★+): Sunday 6 Sep, 2PM (local time) - 4ft (1.2m), 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 Sunday (Sep 06) at 2PM. The primary swell is predicted to be 1.2m and 8s 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 1.3m 8s and forecast to arrive on Sunday (Sep 06) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 4.0m 9s period and expected on Friday (Sep 11) at 8PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Sun 6th Sep) | 4ft (1.2m) 8s |
| Best Surf | 2PM (Sun 6th Sep) | 4ft (1.2m) 8s |
| Most Powerful | 8AM (Sun 6th Sep) | 4.5ft (1.3m) 8s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's be straight with you: the next couple of weeks at Nanwan Beach (South Bay) are looking pretty quiet. There's a bit of a wait for any real action, so don't be in a rush.
We kick off on Sunday, 6th September, with a small 4ft swell from the SW. The wind is offshore, so the surface is clean, but the energy is weak (203). Truth be told, it's poor surf conditions. The water temp is sitting at 83°, which is about average for this time of year, so no surprises there.
Monday the 7th is the best of a very average bunch. The morning is glassy with a 3ft SW swell and a period of 9 seconds. That's a little more shape, but the energy is still weak (155). The comment says "surfable waves but very ordinary conditions," and that sums it up. It's a tough call, but if you're desperate, this is your window. Expect crowds here often.
After Monday, the surf drops off fast. Through the rest of the week and into the next, we're looking at tiny waves—0.7ft to 2ft—with winds that are mostly cross-off or cross-shore. The energy numbers are in the basement (most are under 100). The swell period is short, mostly 8 seconds, so it's just weak, close-out chop. There's a very long 16-second period swell showing up on the 11th, but it's only 0.7ft, so it's a tease.
The 16-day window closes out on Monday, 21st September, with a sudden bump in the afternoon: 6ft from the East with a short 7-second period. The energy shoots up to 368, which is moderate, but the wind is a moderate cross-shore chop. The comment still says "poor surf conditions," so it's likely messy and just not worth it.
Honestly, there are no standouts in this forecast. The consistent breaks are just not delivering. For the next couple of weeks, I'd leave the board at home and find something else to do. The setups here are more interesting for kite surfing than paddle surfing with this onshore chop.
The pattern is quiet, and it tends not to stay poor for long, but right now, there's nothing to get excited about.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Mon afternoon. Warm (max 29°C on Sun morning, min 26°C on Mon afternoon). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Fri night. Warm (max 29°C on Fri morning, min 26°C on Wed night). Winds increasing (light winds from the NNW on Thu night, fresh winds from the NE by Fri night). | ||||||||||||||||||||
Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | |||||||||||||||
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 8 | SW 8 | SW 9 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 7 | SSW 8 | SW 8 | SW 8 | SW 8 | E 17 | E 16 | SW 9 | SSW 8 | SW 10 | SW 9 | SSW 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 191 | 163 | 125 | 152 | 115 | 95 | 78 | 65 | 46 | 44 | 41 | 20 | 18 | 17 | 23 | 21 | 21 | 6 | 24 | 20 | 51 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | glassy | glassy | cross | cross-off | glassy | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross |
High Tide | 2:52AM1.13m | 6:06PM0.54m | 4:04AM1.19m | 6:11PM0.58m | 5:02AM1.23m | 6:29PM0.63m | 5:52AM1.23m | 6:50PM0.71m | 6:37AM1.19m | 7:14PM0.79m | 7:18AM1.10m | 7:38PM0.87m | |||||||||
Low Tide | 10:22AM0.15m | 11:16AM0.09m | 8:28PM0.52m | 11:56AM0.06m | 10:01PM0.44m | 12:30PM0.06m | 11:05PM0.36m | 12:59PM0.09m | 11:59PM0.28m | 1:24PM0.15m | 00:48AM0.23m | 1:45PM0.21m | 1:36AM0.20m | ||||||||
 |  |  | |  |  | | | | | | | | |  | | |  | | | | |
 | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — |
 | — | 6:08 | — | — | 6:07 | — | — | 6:07 | — | — | 6:06 | — | — | 6:05 | — | — | 6:04 | — | — | 6:02 | — |
mm | — | — | — | — | 3 | 1 | — | — | — | — | — | — | — | — | — | — | 2 | 4 | — | 3 | 5 |
Temp °C | 29 | 29 | 28 | 28 | 27 | 26 | 27 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 29 | 29 | 28 | 28 | 27 | 28 |
Feels °C | 32 | 34 | 32 | 31 | 29 | 28 | 30 | 32 | 28 | 29 | 29 | 26 | 29 | 29 | 27 | 30 | 30 | 26 | 26 | 25 | 26 |
Swell 1 Height (m) Direction Period (s) | NE 11 | SW 8 | SW 8 | SW 9 | SW 8 | SW 8 | NE 9 | SW 8 | SW 8 | SW 7 | SSW 8 | SW 8 | SW 8 | SW 8 | NW 8 | NW 6 | SW 9 | SSW 8 | ENE 15 | SW 9 | SSW 8 |
| kJ | 189 | 163 | 125 | 152 | 115 | 95 | 95 | 65 | 46 | 44 | 41 | 20 | 18 | 17 | 14 | 5 | 20 | 6 | 73 | 19 | 51 |
Swell 2 Height (m) Direction Period (s) | E 10 | NE 11 | NE 10 | NE 9 | SE 9 | SE 8 | SW 8 | NE 9 | ESE 10 | ESE 10 | ESE 10 | NNW 7 | SW 7 | SE 10 | SW 8 | E 16 | E 16 | S 11 | SW 10 | ENE 15 | SSW 11 |
| kJ | 7 | 202 | 144 | 83 | 3 | 3 | 78 | 51 | 10 | 10 | 10 | 5 | 9 | 4 | 9 | 21 | 21 | 2 | 24 | 75 | 22 |
Swell 3 Height (m) Direction Period (s) | SSE 7 | SSE 8 | NW 6 | SE 9 | E 13 | NW 5 | SE 8 | ESE 11 | SE 7 | SE 7 | — | ESE 10 | ESE 10 | E 18 | E 17 | SSW 8 | SE 9 | — | NW 7 | SSW 10 | SSE 8 |
| kJ | 5 | 7 | 15 | 3 | 3 | 1 | 3 | 11 | 2 | 2 | — | 10 | 9 | 6 | 23 | 6 | 3 | — | 7 | 20 | 7 |
Wind waves Height (m) Direction Period (s) | SW 8 | NW 5 | — | — | NE 9 | NE 9 | — | ENE 3 | NE 9 | NE 8 | NE 6 | NE 7 | NE 8 | NE 8 | NE 9 | NE 8 | NE 8 | ENE 9 | ENE 10 | ENE 10 | ENE 8 |
| kJ | 191 | 17 | — | — | 166 | 135 | — | 4 | 220 | 120 | 178 | 485 | 692 | 960 | 916 | 398 | 1107 | 2039 | 1396 | 990 | 750 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 2 | 0 | 0 | 0 | 406 | 0 | 0 | 999 | 348 | 996 | 451 | 449 | 2 | 497 | 2 | 390 | 451 | 316 | 535 | 442 | 442 |
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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