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Nanwan Beach (South Bay) surfForecast / South / Taiwan
12 Day Weather and Surf, issued 1 am Thursday 18 Sep 2025 CST
Best Forecast Surf Conditions for Nanwan Beach (South Bay) this week:
The surf forecast for Nanwan Beach (South Bay) over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Sep 20) at 11PM. The primary swell is predicted to be 1.0m and 10s period with a secondary swell of 0.7m and 7s. 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 12 days are 6.5m 14s and forecast to arrive on Tuesday (Sep 23) at 5AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 4.0m 9s period and expected on Tuesday (Sep 23) at 8AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Sat 20th Sep) | 3.5ft (1.0m) 10s |
| Best Surf | 11AM (Mon 22nd Sep) | 11ft (3.5m) 14s |
| Most Powerful | 5AM (Tue 23rd Sep) | 21ft (6.5m) 14s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 12 days.
Short Range Forecast Heavy rain (total 58mm), heaviest during Thu night. Warm (max 29°C on Fri morning, min 25°C on Thu morning). Winds decreasing (strong winds from the NE on Thu afternoon, light winds from the ESE by Fri afternoon). | Days 3-6 Weather Summary Heavy rain (total 69mm), heaviest during Mon night. Warm (max 31°C on Mon morning, min 27°C on Mon night). Winds increasing (light winds from the NE on Sun morning, severe gales from the NE by Mon night). | ||||||||||||||||||||
Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | Wednesday 24 | |||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 5 | 6 | 6 | 5 | 8 | 7 | 8 | 8 | 9 | 9 | 10 | 13 | 14 | 14 | 14 | 13 | 11 | 12 | 11 | 11 | 12 |
Wave (?)Graph  | |||||||||||||||||||||
 kJ (?) | 152 | 212 | 173 | 110 | 104 | 81 | 90 | 116 | 173 | 173 | 318 | 957 | 4914 | 6740 | 11519 | 5457 | 5546 | 2483 | 1463 | 1537 | 1600 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross | cross | cross- on | cross | cross- on | cross- on | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross | cross | cross | cross | cross- on | cross | cross |
High Tide / height (m) | 6:10PM 0.60 | 4:54AM 1.13 | 6:19PM 0.65 | 5:39AM 1.13 | 6:34PM 0.71 | 6:18AM 1.09 | 6:52PM 0.79 | 6:54AM 1.04 | 7:11PM 0.86 | 7:28AM 0.96 | 7:32PM 0.93 | 8:01AM 0.86 | 7:54PM 0.98 | ||||||||
Low Tide / height (m) | 11:51AM 0.12 | 10:01PM 0.48 | 12:19PM 0.13 | 10:59PM 0.40 | 12:41PM 0.16 | 11:46PM 0.32 | 1:01PM 0.20 | 12:29AM 0.27 | 1:17PM 0.25 | 1:09AM 0.23 | 1:31PM 0.30 | 1:49AM 0.21 | 1:43PM 0.34 | 2:30AM 0.21 | |||||||
Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | Wednesday 24 | |||||||||||||||
| Sunrise | 5:43 | - | - | 5:43 | - | - | 5:45 | - | - | 5:45 | - | - | 5:45 | - | - | 5:45 | - | - | 5:46 | - | - |
| Sunset | - | 5:57 | - | - | 5:55 | - | - | 5:54 | - | - | 5:53 | - | - | 5:52 | - | - | 5:52 | - | - | 5:51 | - |
 | |  |  |  |  | | | |  | |  | |  | | | | | | | | |
Rain (mm) | 7 | 6 | 37 | - | 2 | 3 | 1 | 1 | 1 | - | - | - | - | 3 | 33 | 8 | 7 | 18 | 11 | 21 | 7 |
| Temp. °C | 26 | 25 | 27 | 29 | 28 | 28 | 29 | 29 | 28 | 29 | 30 | 28 | 31 | 31 | 28 | 28 | 28 | 28 | 27 | 26 | 27 |
| Feels °C (?) | 24 | 22 | 27 | 29 | 29 | 32 | 32 | 32 | 31 | 31 | 32 | 28 | 28 | 26 | 19 | 25 | 25 | 26 | 27 | 28 | 28 |
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Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for South
Continuing clean conditions at Nanwan Beach (South Bay) (light winds from the ENE at Kaohsiung International Airport 81 km from Nanwan Beach (South Bay)). 2.0m 7s swell from the ESE to make surfable waves.
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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 12 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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