
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
Alright folks, Rusty here. Let’s have a look at what’s on the cards for the coming weeks.
The first bit of the outlook is a bit of a slow start, but from Monday the 3rd things start to pick up, and we’ve got a real standout day on Tuesday the 4th that’s worth circling on the calendar. There’s a decent run of surf through the first week, but the second week gets messy with some serious size and strong winds, so we’ll need to pick our moments.
The water temp is sitting right on 85.1°F, which is pretty much what you’d expect for this time of year, nothing unusual there.
Nanwan Beach (South Bay) is the only spot on the radar. It’s a beach and reef setup that’s fairly consistent and exposed to the south-east. The optimum swell direction is from the SE, so when it comes in from the east, it’s a little off-angle but still works.
Sunday the 2nd is a write-off – tiny little waves around 1.3ft to 1.0ft, and the wind is a bit messy. You’re better off waiting.
Monday the 3rd morning sees a clean 2.3ft east swell with a 15-second period, and the wind is light and cross-off. That’s a nice, clean start to the week. The combined swell energy is moderate at 299. By the afternoon, the swell ticks up to 3.0ft from the east with a 16-second period, and the energy jumps to 489. Still light winds, still clean. It’s surfable, but not the best of the run.
Now, Tuesday the 4th is the standout. Morning starts off glassy with an easterly swell of 4.3ft and a 16-second period. The combined energy is strong at 857. The wind is glass – that’s a big positive, you’ll be surfing clean, peeling waves. By the afternoon, the swell pushes to 4.9ft from the east, energy hits 1127, and the wind is still cross-off and light. This is the best session on offer, and it’s not too big for a good intermediate surfer. Crowds are possible here, so get out early.
Wednesday the 5th morning is for the more experienced crew. The swell is 5.9ft from the east, period up to 17 seconds, and the energy is very strong at 2009. The wind is cross-off and clean. Because the period is long, it’ll be a classic groundswell – more energy, longer lulls between sets, but the waves will be well-shaped. This is better suited to the reef section of the break. The afternoon drops right off to 2.0ft, so don’t sleep in.
Thursday the 6th and Friday the 7th are a write-off. The swell is small and from the west/south-west, and the wind gets strong on Friday – 28 mph cross-off. That’s not paddle-friendly.
Saturday the 8th through to Wednesday the 12th is a big, messy period. Swell sizes jump from 9.8ft up to 18.0ft, with periods between 7 and 12 seconds, and the wind is howling from the west at 31-40 mph. The combined energy is massive – 4885 up to 7986. This is not surfable for paddle surfing. The break is a beach and reef setup, and with that much wind and size, it’s more interesting for kite surfing. The wind is cross-off, but those are gale-force conditions. Stay on the beach.
Thursday the 13th still has a massive 11.5ft swell from the south-west, and the wind is 28-25 mph. The forecast says the swell is too big for this break. I’d agree.
Friday the 14th is still 9.8ft from the south-west with a fresh breeze, and the conditions are marginal. Not worth it.
Now, we get into the second week, and there’s a bit of a silver lining. Saturday the 15th looks promising. The swell drops to 8.2ft from the south-west, with a 9-second period, and the wind is a light 9 mph from the west-northwest. The energy is strong at 1087 to 1254. The conditions are clean. This is a solid option for experienced surfers, but it’s still a big swell for intermediates.
Sunday the 16th is the best of the second week. The swell is 9.8ft from the south-west, period 9-10 seconds, and the wind is light and cross-off. The energy is strong at 1402 to 1493. The forecast says excellent conditions for experienced surfers. This is a late-period standout, but remember it’s a week and a half out, so treat it with a bit of caution. If it holds, it’ll be the best of the second week.
By Monday the 17th, the swell drops to 7.5ft and the wind picks up a bit. Conditions are marginal. Not a priority.
So, to wrap it up: Tuesday the 4th is the absolute best of the whole forecast – glassy, clean, 4.3ft to 4.9ft east swell with a long period. Get in the water early. Sunday the 16th is a promising later option if you
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 | |||||||||||||||||||||
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 |
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 | — | — | — | — |
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 | — | — | — | — | — | — | — | — | — | — | — | — | — |
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 |
— | 1 | 21 | 33 | 35 | — | — | — | — | 32 | 36 | — | — | — | — | 163 | 208 | 328 | 817 | 1114 | 2490 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 838 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 14 | 2 | 0 | 148 | 538 | 148 | 148 | 442 | 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.











