Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 1 Aug 2026:
- Best quality surf: Tuesday 4 Aug, 8PM (local time) - 5ft (1.6m), 19s period, E swell with cross-offshore winds.
- Most powerful swell: Sunday 9 Aug, 2AM (local time) - 21ft (6.5m), 11s period, SW swell with 10,116 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 0.5m and 6s 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 6.5m 11s and forecast to arrive on Sunday (Aug 09) at 2AM. 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 19s period and expected on Thursday (Aug 06) at 2PM.
| 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 (1.6m) 19s |
| Most Powerful | 2AM (Sun 9th Aug) | 21ft (6.5m) 11s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, let’s switch to feet and miles. Here’s the same story for Nanwan.
Water temp is about normal for this time of year. Nanwan Beach (South Bay) is a fairly consistent beach-and-reef, but we’re looking at a real rollercoaster. The first few days are small and clean, then it gets huge and nasty for a week, and then there’s a decent window late in the game.
Right now, Sunday the 2nd, there’s barely a ripple – 1ft to 1ft from the SW and E, with weak energy. Forget it. Monday the 3rd is the first good call. Swell hits 2ft to 3ft from the east, with a long 15-16 second period. That’s groundswell, and the energy is moderate (304-483). The wind is light and cross-offshore, so the waves will be clean and have some shape. Good for intermediate surfers.
Tuesday the 4th is the best early session. Swell builds to 4ft from the east, still with that long period. The energy is ramping up (747-1247), and Tuesday afternoon you get glassy conditions. That’s chest-high, clean, and punchy. Winner.
Wednesday the 5th, the swell hits 6ft from the east, but the wind is up to 25 km/h. Still cross-offshore, so it’s rideable, but the energy is strong (2305). That’s a bit much for beginners. From Thursday the 6th through the 13th, it’s a write-off. The swell gets enormous – up to 23ft – but the wind is screaming at 45-70 km/h with near-gale to gale conditions. The energy is massive (up to 14678), but it’s blown out and dangerous. That’s kite-surfing territory, not paddle surfing.
After that, on the 14th and 15th of August, the swell is still big (12ft-13ft) from the SW, but the wind dies down. Problem is, the swell is too big for the break – it’ll be a messy, boiling mess.
The real standout is Sunday the 16th of August. The swell drops to 8ft from the SW, with a 10-second period, and the energy is strong (1295). The wind is light and cross-offshore in the morning, so the waves should be clean and powerful. This is the best day of the whole 16-day window, but it’s two weeks out, so don’t book your flights yet. Crowds are often a factor here, so get there early.
There’s a big dead zone from the 5th to the 13th, so plan around that.
Rusty.
Short Range ForecastSome drizzle, heaviest during Tue afternoon. Warm (max 30°C on Sun afternoon, min 27°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Thu night. Warm (max 30°C on Fri morning, min 27°C on Tue night). Winds increasing (light winds from the WNW on Tue night, near gales from the WNW by Fri afternoon). | ||||||||||||||||||
Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | ||||||||||||||
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 | SW 7 | E 18 | E 16 | E 15 | E 16 | E 16 | E 16 | E 16 | E 18 | E 18 | SW 7 | W 7 | ENE 19 | WSW 8 | SW 10 | SSW 10 | SW 9 | WSW 7 |
Wave Graph  | |||||||||||||||||||
 kJ | 17 | 17 | 56 | 133 | 225 | 412 | 705 | 701 | 832 | 2015 | 2222 | 24 | 45 | 0 | 94 | 348 | 363 | 360 | 930 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross | cross-off | off | cross-off | cross-off | off | cross-on | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 9:01PM0.66m | 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 | ||||||
Low Tide | 1:59AM0.35m | 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 | |||||||
 |  | |  | | | |  |  | | | | | | |  | | | | |
 | — | 5:28 | — | — | 5:30 | — | — | 5:30 | — | — | 5:30 | — | — | 5:31 | — | — | 5:31 | — | — |
 | 6:37 | — | 6:36 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:34 | — | — | 6:32 | — |
mm | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | 3 | — | — | — |
Temp °C | 29 | 29 | 30 | 29 | 29 | 30 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 29 | 30 | 30 | 30 |
Feels °C | 34 | 32 | 33 | 34 | 31 | 33 | 32 | 33 | 34 | 32 | 30 | 30 | 30 | 30 | 31 | 33 | 27 | 25 | 26 |
Swell 1 Height (m) Direction Period (s) | SW 7 | SW 7 | WSW 7 | SW 7 | E 15 | E 16 | E 16 | E 16 | E 16 | E 18 | E 18 | E 18 | ENE 19 | ENE 19 | ENE 19 | ENE 18 | ENE 18 | ENE 17 | NE 16 |
| kJ | 17 | 17 | 36 | 54 | 225 | 412 | 705 | 701 | 832 | 2015 | 2222 | 2498 | 3527 | 6881 | 7275 | 6791 | 6697 | 4583 | 2285 |
Swell 2 Height (m) Direction Period (s) | E 9 | E 9 | E 18 | E 5 | SW 7 | WSW 7 | E 6 | WSW 7 | E 20 | — | SW 7 | SW 7 | — | — | — | SSW 10 | SSW 10 | SW 9 | — |
| kJ | 6 | 14 | 56 | 15 | 42 | 35 | 33 | 29 | 380 | — | 23 | 24 | — | — | — | 59 | 363 | 360 | — |
Swell 3 Height (m) Direction Period (s) | ESE 10 | E 5 | E 9 | E 16 | E 8 | E 8 | WSW 7 | E 6 | WSW 7 | — | ENE 17 | — | — | — | — | — | — | — | — |
| kJ | 10 | 2 | 6 | 133 | 6 | 6 | 19 | 17 | 35 | — | 27 | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | E 6 | — | E 6 | E 6 | — | — | — | W 7 | W 7 | WNW 4 | W 7 | — | WSW 8 | SW 10 | WNW 6 | WNW 6 | WSW 7 |
| kJ | — | — | 15 | — | 31 | 30 | — | — | — | 35 | 60 | 15 | 45 | — | 94 | 348 | 299 | 344 | 930 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 1232 | 838 | 0 | 0 | 0 | 0 | 0 | 42 | 0 | 0 | 2 | 2 | 42 | 79 | 676 | 148 | 79 | 79 | 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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