Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 1 Aug 2026:
- Best quality surf: Tuesday 4 Aug, 5PM (local time) - 5ft (1.5m), 19s period, E swell with glassy winds.
- Most powerful swell: Saturday 8 Aug, 8AM (local time) - 16ft (5.0m), 10s period, SW swell with 4,865 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 0.4m 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 5.0m 10s and forecast to arrive on Saturday (Aug 08) at 8AM. 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 | 5PM (Tue 4th Aug) | 5ft (1.5m) 19s |
| Most Powerful | 8AM (Sat 8th Aug) | 16ft (5.0m) 10s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, let’s get into it. This is Rusty, and I’m looking at the next 16 days for Nanwan Beach (South Bay).
Right off the bat, we’ve got a bit of a slow start. The first few days are a write-off – tiny, weak swell and poor conditions. Nothing worth paddling out for. It’s not until Monday the 3rd of August that things start to turn. That’s when we see a clean, glassy morning with a 1ft easterly groundswell, period pushing 15 seconds. The energy is moderate (301), and with the wind light and offshore, it’s a proper window. The afternoon glass-off is even better – 2ft, 16-second period, and that combined energy jumps to 473. That’s a solid, fun-sized wave on offer.
But the real standout? You have to wait for Tuesday the 4th of August, afternoon. That’s where it gets special. The swell jumps to 3ft, direction still east, but the period stretches to a very long 19 seconds. The energy is strong (1657), and the wind is glassy. This is excellent surf for experienced surfers – clean, powerful, and well-shaped. The water temp is sitting at 85°, which is about average for the time of year, so no surprises there.
The following days see a massive spike in size, but it gets ugly. From Wednesday the 5th onwards, the wind turns on, howling from the west-northwest, and by the 7th and 8th of August, we’re looking at 5ft to 9ft swells, but with gale-force winds. That’s a full-on mess – poor surf quality, and honestly, this setup is more interesting for kite surfing than paddle surfing. The energy numbers are huge (8979 on the 8th), but it’s unsurfable.
Things settle down a bit in the second week. The 14th of August afternoon shows some promise – 3ft of southwest swell, 9-second period, light wind, and clean conditions. Nothing epic, but a solid surfable wave. The 15th and 16th continue that trend, with the 16th of August morning being the pick of the second week: 4ft, 9-second period, slight offshore wind, and strong energy (2214). That’s a punchy, powerful wave for experienced surfers only.
So, to sum it up: the best on offer is Tuesday afternoon, the 4th of August, with that long-period east swell and glassy conditions. The second week’s highlight is Sunday the 16th of August morning, but it’s a bit more of a gamble. Keep an eye on the forecast, because when it’s good here, it’s really good.
Rusty.
Short Range ForecastMostly dry. Warm (max 30°C on Mon afternoon, min 27°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Thu night. Warm (max 29°C on Wed afternoon, min 27°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | |||||||||||||||
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 | SW 7 | SW 7 | SW 7 | E 18 | E 16 | E 15 | E 16 | E 16 | E 16 | E 19 | E 18 | E 17 | WSW 7 | SW 7 | SW 7 | SW 8 | SW 10 | SSW 10 | WSW 7 | SW 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 19 | 17 | 17 | 17 | 56 | 133 | 225 | 412 | 827 | 811 | 1604 | 1992 | 2196 | 47 | 67 | 109 | 250 | 667 | 460 | 893 | 3460 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | cross-off | cross | cross-off | off | cross-off | glassy | glassy | 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 | 8:05AM1.16m | 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 | 3:12PM0.17m | 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 | — | — | 5:28 | — | — | 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 | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | 1 | 3 | — | 1 | — |
Temp °C | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 30 | 29 | 28 | 28 | 28 | 28 | 29 | 28 | 29 | 29 | 28 | 30 | 31 | 30 |
Feels °C | 34 | 33 | 32 | 33 | 33 | 32 | 31 | 34 | 34 | 32 | 32 | 33 | 30 | 31 | 31 | 33 | 33 | 32 | 33 | 33 | 26 |
Swell 1 Height (m) Direction Period (s) | SW 7 | SW 7 | SW 7 | SW 7 | WSW 7 | SW 8 | E 15 | E 16 | E 16 | E 16 | E 19 | E 18 | E 17 | ENE 17 | ENE 19 | ENE 19 | ENE 19 | ENE 19 | ENE 17 | NE 16 | NE 16 |
| kJ | 19 | 17 | 17 | 17 | 36 | 60 | 225 | 412 | 827 | 811 | 1604 | 1992 | 2196 | 2238 | 3604 | 7304 | 7822 | 8307 | 3832 | 1933 | 1513 |
Swell 2 Height (m) Direction Period (s) | ESE 6 | E 9 | E 9 | E 9 | E 18 | E 16 | SW 7 | SW 7 | WSW 7 | WSW 8 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | SW 7 | SW 7 | SW 8 | — | SSW 10 | NE 22 | — |
| kJ | 3 | 15 | 6 | 14 | 56 | 133 | 56 | 41 | 36 | 50 | 48 | 47 | 59 | 47 | 67 | 109 | 250 | — | 460 | 165 | — |
Swell 3 Height (m) Direction Period (s) | ESE 9 | ESE 6 | ESE 10 | ESE 10 | E 9 | E 5 | E 8 | E 8 | ESE 9 | E 8 | E 5 | — | NE 17 | NE 18 | S 8 | — | — | — | — | — | — |
| kJ | 8 | 3 | 10 | 9 | 6 | 14 | 6 | 6 | 7 | 22 | 5 | — | 11 | 54 | 6 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | E 5 | E 6 | — | E 5 | E 5 | — | — | — | — | — | — | — | — | — | SW 10 | WNW 6 | WSW 7 | SW 9 |
| kJ | — | — | — | 5 | 10 | — | 14 | 14 | — | — | — | — | — | — | — | — | — | 667 | 432 | 893 | 3460 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1160 | 2264 | 1482 | 838 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 2 | 14 | 2 | 0 | 0 | 148 | 2 | 42 | 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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