Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 10 Aug 2026:
- Best quality surf: Monday 17 Aug, 2AM (local time) - 7ft (2.1m), 9s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 16 Aug, 2AM (local time) - 10ft (3.0m), 9s period, SW swell with 1,247 kJ wave energy.
- Next surfable swell (1★+): Sunday 16 Aug, 8PM (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 Sunday (Aug 16) at 8PM. 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 3.0m 9s and forecast to arrive on Sunday (Aug 16) 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 0.7m 14s period and expected on Tuesday (Aug 11) at 2AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Sun 16th Aug) | 6ft (1.9m) 9s |
| Best Surf | 2AM (Mon 17th Aug) | 7ft (2.1m) 9s |
| Most Powerful | 2AM (Sun 16th Aug) | 10ft (3.0m) 9s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, let’s get into it.
To be honest, the next week and a half are looking pretty bleak around here. We’ve got a lot of stormy weather, cross-shore winds, and lumpy, messy surf that’s just not going to be worth your time. It’s a real flat spell, and the forecast is full of those “poor surf conditions” calls. You’re looking at a solid stretch of nothing from Monday the 10th all the way through to Saturday the 22nd. There’s a little bump of energy around the 12th and 13th, but the wind is just going to chop it all up. It’s not going to be a good time.
The one bright spot in all of this is the period around the 16th and 17th. On Sunday morning the 16th, the wind is going to ease off, and we’ve got a clean, cross-off breeze with some decent southwest swell. The water is glassing up, and that’s about as good as it’s going to get for a while. The following Monday afternoon the 17th looks even better—it’s listed as glassy, with the same solid southwest swell. That’s your window. If you can only get out once, make it then.
Now, for the real standout. You see that forecast for Sunday the 23rd? That’s the one. The swell is up to 7.5ft to 8.2ft from the SSW, with a longer 11-second period, and the wind is light and offshore from the NNE. That is a recipe for some proper, clean surf. The combined energy is massive, hitting 1588 in the morning and 1559 in the afternoon. This is the one to circle on the calendar. It’s a bit far out, so don’t book the day off work just yet, but it’s looking very promising. The waves are going to be a bit much for the beginners, but for anyone with a bit of experience, this is where it’s at.
Now, let’s talk about Nanwan Beach (South Bay). It’s a beach and reef setup, and it’s fairly consistent, but the crowds can be a factor. It’s exposed to the southeast, but the magic is when we get that SSW swell, which is right in its wheelhouse. The water temp is sitting at 84.7°, which is about average for this time of year, so it’s nice and warm.
The swell on the 23rd and 24th is going to be pushing up over 8ft, which is expert territory. On the 24th, it’s still big, but the wind looks a bit more iffy. The 23rd is your day. Get on it.
Short Range ForecastHeavy rain (total 35mm), heaviest during Mon night. Warm (max 29°C on Mon night, min 28°C on Mon night). Mainly fresh winds. | Days 5-7 Weather SummaryHeavy rain (total 75mm), heaviest during Sat night. Warm (max 29°C on Thu night, min 28°C on Thu night). Mainly fresh winds. | ||||||||||||||||||
Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 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) | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 8 | SW 9 | SSW 9 | SW 8 | SW 9 | SSW 8 | SW 8 | SW 9 | SW 9 | SW 9 | SW 9 |
Wave Graph  | |||||||||||||||||||
 kJ | 1212 | 971 | 766 | 734 | 743 | 649 | 586 | 567 | 596 | 454 | 564 | 751 | 580 | 651 | 698 | 1247 | 846 | 657 | 703 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross | cross | cross-off | cross | cross | cross-off | cross-off | cross-off |
High Tide | 5:05AM1.31m | 7:05PM0.54m | 5:59AM1.35m | 7:32PM0.57m | 6:48AM1.35m | 7:59PM0.62m | 7:33AM1.28m | 8:26PM0.69m | 8:15AM1.17m | 8:55PM0.76m | 8:55AM1.03m | 9:26PM0.83m | |||||||
Low Tide | 9:36PM0.46m | 12:56PM-0.02m | 10:47PM0.40m | 1:35PM-0.01m | 11:46PM0.34m | 2:10PM0.03m | 00:41AM0.30m | 2:39PM0.10m | 1:33AM0.28m | 3:05PM0.18m | 2:26AM0.28m | 3:25PM0.26m | 3:20AM0.31m | ||||||
 |  | | | | | | |  | | | | | | | | | | | |
 | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — |
 | 6:30 | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:28 | — | — | 6:27 | — |
mm | 11 | 6 | 5 | 6 | 1 | 2 | 3 | 1 | — | 6 | 5 | 7 | 15 | 8 | 6 | 23 | 5 | — | 3 |
Temp °C | 29 | 29 | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 |
Feels °C | 30 | 31 | 30 | 30 | 30 | 30 | 32 | 30 | 30 | 32 | 30 | 30 | 29 | 30 | 30 | 29 | 32 | 32 | 32 |
Swell 1 Height (m) Direction Period (s) | ENE 14 | ENE 13 | SW 9 | ENE 12 | SW 9 | SW 9 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | SSW 9 | NE 10 | SE 8 | SSW 8 | ENE 10 | ENE 11 | SW 9 | SW 9 | NE 10 |
| kJ | 201 | 181 | 766 | 117 | 743 | 649 | 78 | 47 | 46 | 41 | 564 | 25 | 15 | 651 | 10 | 12 | 846 | 657 | 27 |
Swell 2 Height (m) Direction Period (s) | SE 9 | SE 10 | ENE 13 | SE 8 | ENE 12 | ENE 12 | SE 8 | SE 8 | SE 8 | SE 8 | NE 10 | SSE 8 | ENE 10 | SW 9 | SSE 8 | SSE 8 | ENE 11 | NE 11 | ESE 11 |
| kJ | 23 | 46 | 178 | 35 | 113 | 78 | 16 | 16 | 18 | 9 | 26 | 7 | 20 | 83 | 6 | 6 | 24 | 31 | 12 |
Swell 3 Height (m) Direction Period (s) | NE 11 | N 10 | SE 9 | NE 9 | SE 8 | SE 8 | N 9 | N 8 | NE 6 | NE 8 | SSE 9 | SE 12 | SE 11 | ENE 10 | SE 11 | ESE 10 | ESE 10 | SE 8 | SSE 7 |
| kJ | 4 | 2 | 41 | 3 | 35 | 34 | 1 | 1 | 1 | 3 | 8 | 5 | 5 | 10 | 4 | 10 | 11 | 16 | 5 |
Wind waves Height (m) Direction Period (s) | SW 9 | SW 9 | — | SW 9 | — | — | SW 9 | SW 9 | SW 8 | SW 9 | SW 9 | SW 8 | SW 9 | SW 9 | SW 8 | SW 9 | — | — | SW 9 |
| kJ | 1212 | 971 | — | 734 | — | — | 586 | 567 | 596 | 454 | 461 | 751 | 580 | 573 | 698 | 1247 | — | — | 703 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 148 | 375 | 42 | 148 | 42 | 42 | 148 | 42 | 42 | 329 | 541 | 363 | 348 | 442 | 42 | 14 | 14 | 14 | 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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