Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 2 Aug 2026:
- Best quality surf: Tuesday 4 Aug, 8PM (local time) - 5ft (1.5m), 17s period, E swell with glassy winds.
- Most powerful swell: Sunday 9 Aug, 2PM (local time) - 16ft (5.0m), 11s period, SW swell with 5,638 kJ wave energy.
- Next surfable swell (1★+): Sunday 2 Aug, 5PM (local time) - 1ft (0.3m), 18s period with E 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 02) at 5PM. The primary swell is predicted to be 0.3m and 18s period with a secondary swell of 0.6m and 7s. Another secondary swell of 0.3m and 3s is also forecast. 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 5.0m 11s and forecast to arrive on Sunday (Aug 09) at 2PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.5m 18s period and expected on Thursday (Aug 06) at 11PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Sun 2nd Aug) | 1ft (0.3m) 18s |
| Best Surf | 8PM (Tue 4th Aug) | 5ft (1.5m) 17s |
| Most Powerful | 2PM (Sun 9th Aug) | 16ft (5.0m) 11s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Imperial
Alright, let’s run through it again. The first few days are a real dud. Sunday the 2nd and Monday the 3rd are tiny and messy, with barely any energy. Don’t bother.
The first real standout hits on Tuesday afternoon, August the 4th, at Nanwan Beach (South Bay). We’ve got a clean 5ft swell from the east with a very long period of 16 seconds. That’s proper groundswell with solid energy (1128), and a light offshore wind from the northwest is going to keep it glassy. The water is a warm 85°F, which is about average for this time of year. This is your best early call.
Next up is Wednesday morning, August the 5th. The swell bumps up to 6ft, still from the east, with a 17-second period. That’s a lot of juice (2023), and the wind is a clean cross-off from the west-northwest. It’ll be clean, but remember that long-period east swell can be a bit tricky at a beach-and-reef break like this.
From Thursday the 6th through Sunday the 10th, things go sideways. The wind gets nasty, and the wave heights blow past 8ft, hitting 18ft by Monday the 10th. That’s expert-only territory, and the wind is shredding the surface. The energy readings are huge (7246), but the quality is trash. With a beach-and-reef setup and these winds, it’s looking more like a kite surfer’s paradise than a paddle surfer’s.
By Wednesday the 12th, the swell is still too big at around 13ft. The next real chance for clean waves comes on Saturday afternoon, August the 15th. The swell drops to a manageable 7ft from the southwest with a 10-second period. The wind is light and cross-off, making for clean conditions and a solid energy reading of 899. That’s a good session, but it’s a long way off.
So, the pick of the bunch is Tuesday afternoon, August 4th, and Wednesday morning, August 5th. After that, expect a rough week of big, messy surf, with a possible return to clean conditions around the 15th. Keep your eyes on that long-range forecast, but for now, those first two days are the ones to chase.
- Rusty
Short Range ForecastMostly dry. Warm (max 30°C on Sun afternoon, min 27°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 29°C on Wed morning, min 28°C on Wed morning). Winds increasing (light winds from the WNW on Wed night, strong winds from the WNW by Fri night). | ||||||||||||||||||||
Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | |||||||||||||||
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 7 | E 18 | E 16 | E 15 | E 16 | E 16 | E 16 | E 16 | E 18 | E 17 | W 7 | SW 7 | WSW 8 | SW 8 | SW 8 | SW 9 | SW 8 | ENE 17 | WSW 7 | WSW 8 | WSW 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 17 | 56 | 133 | 225 | 412 | 705 | 822 | 1106 | 1759 | 1977 | 36 | 54 | 98 | 94 | 99 | 174 | 166 | 0 | 817 | 1114 | 2490 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | cross-off | cross-off | off | glassy | cross-off | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 8:39AM1.09m | 9:30PM0.72m | 9:16AM0.99m | 10:03PM0.79m | 9:57AM0.86m | 10:43PM0.86m | 10:48AM0.72m | 11:31PM0.93m | 12:04PM0.58m | 00:31AM0.99m | 2:26PM0.49m | 1:43AM1.07m | 5:31PM0.49m | 2:58AM1.15m | |||||||
Low Tide | 3:34PM0.21m | 2:49AM0.36m | 3:56PM0.26m | 3:48AM0.37m | 4:18PM0.31m | 5:01AM0.38m | 4:40PM0.37m | 6:37AM0.37m | 5:03PM0.41m | 8:36AM0.31m | 5:28PM0.46m | 10:14AM0.20m | 6:01PM0.49m | ||||||||
 |  |  | | |  | | | | | | | | | | | | | | | | |
 | 5:28 | — | — | 5:30 | — | — | 5:30 | — | — | 5:30 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — |
 | — | 6:36 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:34 | — | — | 6:32 | — | — | 6:32 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 29 | 30 | 28 | 29 | 30 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 30 |
Feels °C | 31 | 33 | 32 | 31 | 34 | 32 | 33 | 33 | 32 | 32 | 31 | 31 | 29 | 32 | 33 | 27 | 26 | 27 | 27 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | SW 7 | WSW 7 | SW 7 | E 15 | E 16 | E 16 | E 16 | E 16 | E 18 | E 17 | ENE 17 | ENE 18 | ENE 19 | ENE 18 | ENE 18 | ENE 18 | ENE 18 | ENE 17 | NE 16 | NE 17 | NE 16 |
| kJ | 17 | 36 | 43 | 225 | 412 | 705 | 822 | 1106 | 1759 | 1977 | 2162 | 3127 | 5128 | 6315 | 6706 | 7227 | 6339 | 2862 | 1532 | 2118 | 2078 |
Swell 2 Height (m) Direction Period (s) | E 9 | E 18 | E 16 | WSW 7 | WSW 7 | E 6 | E 6 | WSW 7 | WSW 7 | — | SE 9 | SW 7 | WSW 8 | SW 8 | SW 8 | SW 9 | SW 8 | — | — | — | — |
| kJ | 14 | 56 | 133 | 35 | 36 | 34 | 17 | 18 | 18 | — | 13 | 54 | 98 | 94 | 99 | 174 | 166 | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | ESE 5 | ESE 6 | E 9 | E 8 | E 8 | SW 7 | WSW 7 | SE 8 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 3 | 6 | 6 | 6 | 6 | 23 | 18 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | E 3 | E 5 | E 6 | E 5 | — | — | — | — | W 7 | W 7 | — | — | — | — | WNW 6 | WNW 6 | WSW 6 | WSW 7 | WSW 8 | WSW 9 |
| kJ | — | 1 | 21 | 33 | 35 | — | — | — | — | 32 | 36 | — | — | — | — | 163 | 208 | 328 | 817 | 1114 | 2490 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 838 | 0 | 0 | 676 | 0 | 0 | 42 | 0 | 2 | 2 | 2 | 42 | 2 | 148 | 148 | 2 | 148 | 148 | 390 | 148 | 148 |
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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