Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 27 Jul 2026:
- Most powerful swell: Monday 3 Aug, 8PM (local time) - 2.5ft (0.7m), 16s period, E swell with 243 kJ wave energy.
Best Forecast Surf Conditions for Nanwan Beach (South Bay) this week:
The most powerful waves expected at Nanwan Beach (South Bay) in the next 16 days are 0.7m 16s and forecast to arrive on Monday (Aug 03) at 8PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 3s period and expected on Monday (Aug 03) at 8AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Mon 3rd Aug) | 2.5ft (0.7m) 16s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, let’s get into it. The first few days here are a bit of a write-off – weak, short-period swell and cross-shore winds are making for pretty poor conditions. Honestly, there’s nothing to get excited about until the new month rolls in. We’re looking at a solid stretch of dud surf from the 27th of July right through to the 3rd of August. Not a single decent wave in that window.
The first real glimmer of hope pops up on the 4th of August. It’s still a bit marginal, but the swell direction swings around to the east, with a period of 16 seconds – that’s proper groundswell. The energy is moderate (757) and winds are light and onshore. It’s not perfect, but it’s a start.
Now, the real standout is shaping up for the 9th and 10th of August. Monday the 10th is looking like the pick of the entire forecast. We’re seeing a solid 10ft SSW groundswell, with a period of 10 seconds, and the combined energy is very strong (1861). The wind is offshore through the morning, making for clean conditions. The swell is big enough to get your heart pumping, but it’s a touch over 8ft, so this is really only for the experienced crew. The break is a beach and reef setup, so expect some proper power.
The 9th of August (Sunday) is also a good shout – 8ft from the SW with a clean offshore wind from the NNW. The energy is moderate to strong (789), and the period is 8 seconds. It’s a touch smaller, but still a quality session.
The 11th of August keeps the theme going – 10ft at 12 seconds, which is a very long period groundswell. That can make a beach break a bit tricky, but with the wind staying cross-offshore, it’ll be clean. The energy is through the roof (2348), and it’s a day for the experts.
Really, the only window worth chasing here is from the 9th to the 11th of August, with the 10th being the absolute standout. For the rest, you’re better off waiting.
Stay salty,
Rusty
Short Range ForecastLight rain (total 7mm), mostly falling on Mon night. Warm (max 29°C on Tue morning, min 27°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Sat afternoon. Warm (max 29°C on Thu afternoon, min 27°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | ||||||||||||||
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) | SSW 7 | SW 8 | SW 7 | SSW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 142 | 164 | 126 | 98 | 86 | 77 | 77 | 64 | 78 | 80 | 78 | 49 | 48 | 35 | 27 | 25 | 33 | 33 | 18 | 22 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | on | on | glassy | cross-on | on | cross-on | cross-on | cross-on | cross-on |
High Tide | 7:11PM0.53m | 5:40AM1.17m | 7:28PM0.54m | 6:19AM1.20m | 7:48PM0.55m | 6:56AM1.22m | 8:10PM0.58m | 7:31AM1.20m | 8:34PM0.61m | 8:05AM1.16m | 9:01PM0.66m | 8:39AM1.09m | 9:30PM0.72m | |||||||
Low Tide | 10:13PM0.47m | 1:27PM0.12m | 11:04PM0.43m | 1:56PM0.12m | 11:49PM0.40m | 2:23PM0.12m | 00:31AM0.37m | 2:49PM0.14m | 1:14AM0.35m | 3:12PM0.17m | 1:59AM0.35m | 3:34PM0.21m | 2:49AM0.36m | |||||||
 |  |  | |  | | |  |  | | | |  | |  | | | | | | |
 | — | — | 5:26 | — | — | 5:28 | — | — | 5:28 | — | — | 5:28 | — | — | 5:28 | — | — | 5:28 | — | — |
 | 6:38 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — |
mm | 1 | 3 | — | — | — | 1 | — | 2 | — | — | — | — | — | — | 1 | 3 | 2 | 1 | — | 1 |
Temp °C | 28 | 27 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 28 | 29 | 28 |
Feels °C | 29 | 28 | 29 | 29 | 30 | 29 | 30 | 31 | 31 | 31 | 31 | 32 | 32 | 32 | 33 | 32 | 33 | 31 | 31 | 32 |
Swell 1 Height (m) Direction Period (s) | SSW 7 | SW 8 | SW 7 | SSW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 |
| kJ | 142 | 164 | 126 | 98 | 86 | 77 | 77 | 64 | 78 | 80 | 78 | 49 | 48 | 35 | 27 | 25 | 33 | 33 | 18 | 22 |
Swell 2 Height (m) Direction Period (s) | W 7 | ESE 10 | SE 10 | SE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | E 9 | SE 4 | SE 4 | SE 6 | SE 6 | ESE 6 | ESE 6 | SE 6 | SE 10 | ESE 9 | E 9 |
| kJ | 35 | 40 | 28 | 26 | 20 | 20 | 19 | 19 | 18 | 15 | 12 | 5 | 11 | 10 | 7 | 7 | 9 | 23 | 17 | 13 |
Swell 3 Height (m) Direction Period (s) | ESE 10 | W 7 | ENE 9 | W 6 | ENE 8 | E 10 | ENE 8 | ENE 9 | ENE 9 | ESE 9 | ESE 9 | ESE 9 | E 8 | E 10 | ESE 9 | E 9 | E 9 | E 9 | E 9 | ESE 9 |
| kJ | 39 | 8 | 8 | 3 | 7 | 2 | 7 | 8 | 8 | 8 | 8 | 8 | 13 | 8 | 8 | 15 | 15 | 6 | 6 | 8 |
Wind waves Height (m) Direction Period (s) | ESE 6 | ESE 5 | ESE 4 | E 4 | E 4 | E 4 | E 4 | ESE 4 | ESE 4 | ESE 4 | — | — | SSE 4 | — | — | — | — | — | — | — |
| kJ | 24 | 17 | 11 | 18 | 15 | 19 | 10 | 8 | 11 | 12 | — | — | 4 | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 148 | 148 | 451 | 451 | 451 | 451 | 451 | 511 | 451 | 451 | 451 | 451 | 2191 | 2 | 1160 | 996 | 1195 | 694 | 996 | 676 |
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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