Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 30 Jul 2026:
- Best quality surf: Tuesday 4 Aug, 2PM (local time) - 5ft (1.5m), 19s period, E swell with glassy winds.
- Most powerful swell: Wednesday 5 Aug, 5AM (local time) - 6.5ft (2.0m), 18s period, E swell with 2,715 kJ wave energy.
- Next surfable swell (1★+): Sunday 2 Aug, 11PM (local time) - 1ft (0.3m), 16s 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 11PM. The primary swell is predicted to be 0.3m and 16s period with a secondary swell of 0.6m and 7s. Another secondary swell of 0.3m and 6s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Nanwan Beach (South Bay) in the next 16 days are 2.0m 18s and forecast to arrive on Wednesday (Aug 05) at 5AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 19s period and expected on Thursday (Aug 06) at 8AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Sun 2nd Aug) | 1ft (0.3m) 16s |
| Best Surf | 2PM (Tue 4th Aug) | 5ft (1.5m) 19s |
| Most Powerful | 5AM (Wed 5th Aug) | 6.5ft (2.0m) 18s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Right then, let’s have a look at what’s on offer at Nanwan Beach (South Bay). It’s a beach and reef setup, and it’s a fairly consistent spot, so it tends to see a bit of action. The water temperature is sitting at 85°, which is pretty much normal for this time of year, so no surprises there.
The first few days are a bit of a write-off, to be honest. Friday the 31st starts with a tiny 2ft SW swell (57 combined energy) and a cross-on wind, so it’s messy. It does go glassy in the afternoon, but the swell is just too small to do anything with. Saturday and Sunday are the same story – small, weak, and all over the place. You’re looking at a 3-day gap before anything half-decent shows up.
Then Monday the 3rd afternoon is where it finally gets interesting. The wind drops to absolute glass, and we get a 3ft E swell pushing in with a long 16-second period (467 combined energy). It’s not huge, but that glassy surface and clean conditions make it a proper little session. The real standout, though, is Tuesday the 4th. That morning, it’s fully glassy with a 4ft E swell and a 15-second period (995 combined energy). The afternoon steps it up to 5ft from the E, 18-second period (1779 combined energy), and a clean cross-off wind. This is the pick of the whole run – excellent, lined-up waves for experienced surfers. Crowds are often here, so expect some company.
After that, the surf drops off again. Wednesday the 5th and Thursday the 6th are small and choppy, and then Friday the 7th turns into a full-on blowout with 34 mph winds and 8ft of slop. Don’t bother. The weekend of the 8th and 9th sees massive 15ft SW swells, but with gale-force cross-winds, it’s just a washing machine. That kind of energy (over 5000 combined energy) and those winds make it far more interesting for kite surfing than paddle surfing.
The following week, from Monday the 11th through to the 15th, has some cleaner conditions with cross-off winds and 6ft to 8ft SW swell, but the energy is moderate and the wind is often moderate. Tuesday the 11th afternoon looks the best of that bunch, with a light breeze and 6ft SW swell (746 combined energy), giving clean waves for someone with a bit of experience. The rest of the week is marred by storm risks and strong winds, so it’s a gamble.
So, for the whole 16-day window, there’s one true standout: Tuesday the 4th. Get out there if you can.
Rusty.
Short Range ForecastMostly dry. Warm (max 29°C on Fri morning, min 27°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Tue afternoon. Warm (max 29°C on Mon morning, min 27°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | |||||||||||||||
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 8 | SW 8 | SW 8 | SW 7 | SW 7 | SW 7 | SW 7 | E 18 | E 16 | E 15 | E 16 | E 16 | E 15 | E 18 | E 18 | WSW 7 | WSW 7 | SW 7 | SW 7 | SW 8 | SSW 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 36 | 39 | 28 | 19 | 17 | 17 | 29 | 56 | 133 | 225 | 412 | 582 | 520 | 1745 | 2325 | 31 | 31 | 67 | 189 | 298 | 379 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | glassy | cross-on | on | glassy | cross-on | cross | off | cross-on | glassy | off | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 8:34PM0.61m | 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 | ||||||||
Low Tide | 2:49PM0.14m | 1:14AM0.35m | 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 | ||||||||
 |  |  | | |  | |  | | | | | |  |  | | | | | |  | |
 | 5:28 | — | — | 5:28 | — | — | 5:28 | — | — | 5:30 | — | — | 5:30 | — | — | 5:30 | — | — | 5:31 | — | — |
 | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:34 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | 1 |
Temp °C | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 28 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 29 |
Feels °C | 33 | 33 | 32 | 32 | 32 | 33 | 33 | 31 | 32 | 32 | 32 | 32 | 31 | 32 | 30 | 30 | 30 | 30 | 30 | 30 | 24 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SW 8 | SW 8 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 8 | SW 8 | E 16 | E 16 | E 15 | E 18 | E 18 | E 18 | ENE 18 | ENE 20 | ENE 19 | ENE 18 | ENE 18 |
| kJ | 36 | 39 | 28 | 19 | 17 | 17 | 29 | 22 | 59 | 59 | 412 | 582 | 520 | 1745 | 2325 | 2807 | 3127 | 5025 | 6595 | 3843 | 4777 |
Swell 2 Height (m) Direction Period (s) | SE 6 | SE 6 | SE 6 | ESE 6 | E 9 | E 9 | E 9 | E 18 | E 16 | E 15 | SW 7 | WSW 7 | E 19 | WSW 7 | WSW 7 | WSW 7 | WSW 7 | NNE 21 | SW 7 | ENE 21 | SSW 8 |
| kJ | 15 | 8 | 8 | 3 | 15 | 6 | 6 | 56 | 133 | 225 | 44 | 35 | 441 | 34 | 32 | 31 | 31 | 170 | 189 | 3261 | 379 |
Swell 3 Height (m) Direction Period (s) | E 9 | E 8 | ESE 9 | ESE 9 | ESE 6 | ESE 10 | ESE 10 | ESE 6 | E 6 | E 8 | E 6 | E 6 | WSW 7 | — | — | NE 19 | NE 18 | — | — | SW 8 | — |
| kJ | 6 | 13 | 8 | 8 | 3 | 10 | 9 | 6 | 5 | 22 | 11 | 11 | 34 | — | — | 56 | 53 | — | — | 298 | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | ESE 5 | — | — | — | — | — | — | — | — | — | — | SW 7 | — | — | W 5 |
| kJ | — | — | — | — | — | — | 3 | — | — | — | — | — | — | — | — | — | — | 67 | — | — | 51 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 79 | 2 | 1160 | 1232 | 1338 | 996 | 639 | 42 | 0 | 42 | 0 | 0 | 0 | 0 | 2 | 2 | 2 | 2 | 79 | 2 | 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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