Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 2 Sep 2026:
- Best quality surf: Saturday 5 Sep, 5PM (local time) - 4.5ft (1.4m), 8s period, SW swell with cross-offshore winds.
- Most powerful swell: Wednesday 2 Sep, 11PM (local time) - 13ft (4.0m), 11s period, SW swell with 4,035 kJ wave energy.
- Next surfable swell (1★+): Saturday 5 Sep, 5PM (local time) - 4.5ft (1.4m), 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 Saturday (Sep 05) at 5PM. The primary swell is predicted to be 1.4m 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 4.0m 11s and forecast to arrive on Wednesday (Sep 02) at 11PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.1m 7s period and expected on Wednesday (Sep 09) at 11PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Sat 5th Sep) | 4.5ft (1.4m) 8s |
| Best Surf | 5PM (Sat 5th Sep) | 4.5ft (1.4m) 8s |
| Most Powerful | 11PM (Wed 2nd Sep) | 13ft (4.0m) 11s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, listen up. Nanwan Beach (South Bay) is looking like a tough one. We’ve got a big dry spell at the start, so don’t even think about paddling out for the first few days – it’s a total bust.
Water temp is about 84°F, which is pretty standard for now.
Your first real chance comes on Saturday afternoon, the 5th of September. We’re looking at a 5ft swell from the SW, with a period of 8 seconds. The energy is weak, sitting at 278. But the key is the wind – it’s blowing offshore from the NNW, just a light breeze. That means clean, glassy conditions. It’s not big, but for a mellow session on a longboard, this is your best bet. The break is fairly consistent, but watch out – crowds are often a problem here.
Sunday morning, the 6th, is a step down to 4ft from the SSW, with a 9-second period. The wind is cross-offshore from the NE. It’s rideable, but nothing special. The energy is weak, only 207.
After that, it’s a desert. The swell drops to under 3ft, and the wind gets messy. There’s a tiny window on Monday morning, the 7th, with 3ft and glassy conditions, but the energy is a measly 69 – not enough to even push a decent wave. The rest of the fortnight is just small, weak, and blown out. Strong breezes and cross-off winds might keep the surface clean, but there’s no power in the water.
If you’re after one standout, it’s Saturday afternoon, the 5th of September. That’s the only time the wind and swell line up for a clean, surfable wave, even if it’s small. For the rest of it, you’re just waiting for a new swell.
Rusty.
Short Range ForecastHeavy rain (total 61mm), heaviest during Wed night. Warm (max 28°C on Wed night, min 27°C on Thu morning). Winds decreasing (fresh winds from the SW on Thu morning, light winds from the WSW by Fri night). | Days 5-7 Weather SummaryModerate rain (total 13mm), heaviest on Sat night. Warm (max 28°C on Sun morning, min 26°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | ||||||||||||||
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 11 | SW 10 | SW 9 | SW 9 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SSW 9 | SW 8 | SW 8 | SSW 8 | SSW 8 | SSW 7 | SW 8 | SW 8 | SW 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 3386 | 2114 | 1521 | 1149 | 765 | 567 | 418 | 322 | 260 | 159 | 211 | 153 | 91 | 112 | 103 | 70 | 100 | 95 | 64 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross | glassy | cross | glassy | cross |
High Tide | 9:55PM1.02m | 10:47AM0.58m | 10:45PM1.05m | 12:37PM0.46m | 11:53PM1.06m | 1:23AM1.08m | 2:52AM1.13m | 6:06PM0.54m | 4:04AM1.19m | 6:11PM0.58m | |||||||||
Low Tide | 5:07AM0.28m | 3:26PM0.41m | 6:49AM0.28m | 3:21PM0.44m | 8:56AM0.23m | 10:22AM0.15m | 11:16AM0.09m | 8:28PM0.52m | 11:56AM0.06m | 10:01PM0.44m | |||||||||
 |  | | | | | |  | | |  | | | |  |  | | | | |
 | — | 5:39 | — | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — |
 | 6:12 | — | 6:12 | — | — | 6:10 | — | — | 6:09 | — | — | 6:08 | — | — | 6:07 | — | — | 6:07 | — |
mm | 23 | 7 | 5 | 10 | 7 | 1 | 7 | — | 1 | 3 | 2 | 4 | 4 | — | — | — | — | — | — |
Temp °C | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 28 | 28 | 27 | 27 | 27 | 26 | 27 | 28 | 27 |
Feels °C | 29 | 29 | 29 | 29 | 29 | 29 | 32 | 30 | 29 | 30 | 30 | 31 | 32 | 30 | 29 | 28 | 32 | 30 | 29 |
Swell 1 Height (m) Direction Period (s) | ENE 10 | ENE 9 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | SW 8 | SW 8 | SW 8 | SW 8 | SSW 9 | SW 8 | SW 8 | SSW 8 | SSW 8 | SSW 7 | SW 8 | SW 8 | SW 8 |
| kJ | 114 | 69 | 158 | 206 | 125 | 97 | 418 | 322 | 260 | 159 | 211 | 153 | 91 | 112 | 103 | 70 | 100 | 95 | 64 |
Swell 2 Height (m) Direction Period (s) | — | ENE 12 | — | SE 10 | SE 10 | SE 9 | ENE 10 | NE 9 | NE 9 | NE 5 | NE 11 | NE 11 | NE 11 | NE 10 | NE 10 | NE 10 | NE 9 | NE 9 | NE 8 |
| kJ | — | 49 | — | 4 | 14 | 21 | 40 | 39 | 39 | 17 | 96 | 94 | 134 | 79 | 79 | 74 | 51 | 39 | 35 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | E 18 | SE 9 | SE 9 | SE 9 | SE 8 | SSW 11 | SE 8 | SE 8 | SE 8 | SSE 7 | E 9 | SE 8 | SE 8 | ESE 11 | ESE 10 |
| kJ | — | — | — | — | 6 | 20 | 20 | 20 | 18 | 45 | 9 | 10 | 9 | 5 | 7 | 3 | 3 | 11 | 10 |
Wind waves Height (m) Direction Period (s) | SW 11 | SW 10 | SW 9 | SW 9 | SW 8 | SW 8 | — | — | — | NNE 5 | W 4 | — | — | — | — | — | — | — | NE 3 |
| kJ | 3386 | 2114 | 1521 | 1149 | 765 | 567 | — | — | — | 36 | 6 | — | — | — | — | — | — | — | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 148 | 148 | 693 | 42 | 885 | 14 | 14 | 14 | 0 | 0 | 14 | 0 | 42 | 42 | 42 | 2 | 14 | 0 | 79 |
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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