
Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 23 Jul 2026:
- Best quality surf: Saturday 25 Jul, 5PM (local time) - 13ft (4.0m), 10s period, S swell with cross-shore winds.
- Most powerful swell: Saturday 25 Jul, 8AM (local time) - 13ft (4.0m), 10s period, ESE swell with 2,787 kJ wave energy.
- Next surfable swell (1★+): Saturday 25 Jul, 5PM (local time) - 13ft (4.0m), 10s period with S 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 Saturday (Jul 25) at 5PM. The primary swell is predicted to be 4.0m and 10s period with a secondary swell of 0.1m and 16s. The wind is predicted to be cross-shore as the swell arrives.
The most powerful waves expected at Nanwan Beach (South Bay) in the next 16 days are 4.0m 10s and forecast to arrive on Saturday (Jul 25) at 8AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.5m 8s period and expected on Friday (Jul 24) at 8PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Sat 25th Jul) | 13ft (4.0m) 10s |
| Best Surf | 5PM (Sat 25th Jul) | 13ft (4.0m) 10s |
| Most Powerful | 8AM (Sat 25th Jul) | 13ft (4.0m) 10s |
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 offer for the next couple of weeks.
Right off the bat, we’ve got a tough start. The first few days are mostly a write-off with poor surf conditions and very little energy. It’s not until Thursday afternoon, the 30th of July, that things start to look a bit more promising. The water temp is about average for this time of year, nothing to write home about.
Nanwan Beach (South Bay) is the only spot in the game here. It’s a beach and reef setup, fairly consistent, but crowds are likely. The optimum swell direction is from the SE, and the place is fairly exposed.
Thursday 30th July afternoon is your first real window. The swell is a modest 5ft from the SSW with a period of 9 seconds. The combined energy is still low at 396 (moderate), but the wind is a gentle cross-off breeze making for clean conditions. It’s not a standout, but it’s the first decent chance.
Friday 31st July sees a big jump in size but the quality drops. Morning has 10ft from the ESE with a 13-second period – that’s a long period groundswell, but it’s cross-shore winds and messy. Combined energy hits 2663 (strong). The afternoon is similar, 10ft from the ESE, 14-second period, 3955 energy (strong). The wind is cross again, so it’s lumpy. Not recommended for a paddle.
Saturday 1st August is a monster. Morning sees 15ft from the ESE with a 14-second period, combined energy a massive 8444 (very strong). The wind is cross-shore though, and the swell is way too big for this break – experts only, and even then it’s borderline. Afternoon drops to 13ft from the ESE, 13-second period, 4979 energy (very strong), but with onshore wind making it even messier. This is kite-surfing territory, not paddle surfing.
Sunday 2nd August drops back down to 5ft from the SW, 8-second period, 484 energy (moderate). Winds are cross-shore, poor surf conditions. Not worth it.
Monday 3rd August is another big day – 13ft from the W and WSW, with short 8-9 second periods, 2679 energy (strong). Cross-shore winds and lumpy. Too big and messy.
Tuesday 4th August could be a real beauty if you’re an expert. Morning: 15ft from the SW, 11-second period, 4200 energy (very strong). Glassy conditions – that’s a huge positive. The wind is light and glassy from the SSE. The swell is too big for beginners, but for experts, this is the standout of the whole forecast. The 13ft afternoon from the SW with glassy wind is also a cracker, 3790 energy (very strong). This is your best bet if you’ve got the skills.
Wednesday 5th August morning: 16ft from the SW, 12-second period, 7332 energy (very strong). The wind is cross-off from the WNW, so clean. The swell is massive, only for experts. The afternoon drops to 12ft from the SW, 11-second period, 5146 energy (very strong), but the wind is a near gale – avoid.
Thursday 6th and Friday 7th August are both blown out with strong cross-shore winds and messy conditions, on strong to very strong energy levels. Not worth paddling out.
Saturday 8th August morning: 10ft from the SW, 10-second period, 1541 energy (strong). Cross-off wind from the W, clean conditions. It’s a marginal call, but it’s the last decent chance in the window.
Overall, if you’re an expert, make a beeline for Tuesday 4th August – glassy, powerful, long period groundswell, but it’s big. For everyone else, the pickings are slim. The 30th of July afternoon is a small, clean session for the intermediates. The rest is either flat, blown out, or too big.
Stay safe out there.
Rusty
Short Range ForecastHeavy rain (total 60mm), heaviest during Fri night. Warm (max 30°C on Fri morning, min 25°C on Sun afternoon). Winds decreasing (strong winds from the ENE on Fri night, light winds from the E by Sun afternoon). | Days 5-7 Weather SummaryHeavy rain (total 29mm), heaviest during Tue night. Warm (max 29°C on Tue afternoon, min 27°C on Sun night). Winds increasing (light winds from the ENE on Sun night, strong winds from the ENE by Tue morning). | ||||||||||||||||||
Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | ||||||||||||||
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 | ESE 10 | ESE 10 | S 10 | SW 10 | WSW 10 | WSW 10 | WSW 10 | W 9 | SW 8 | ESE 6 | ESE 6 | ESE 6 | SSW 8 | ESE 6 | SSW 8 | SSW 9 |
Wave Graph | |||||||||||||||||||
16 | 7 | 7 | 2316 | 1919 | 2783 | 1111 | 772 | 720 | 408 | 173 | 70 | 95 | 153 | 119 | 123 | 127 | 188 | 244 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross | cross-on | cross | cross | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross |
High Tide | 2:28AM0.96m | 3:22AM1.01m | 4:12AM1.07m | 6:57PM0.52m | 4:58AM1.12m | 7:11PM0.53m | 5:40AM1.17m | 7:28PM0.54m | 6:19AM1.20m | 7:48PM0.55m | |||||||||
Low Tide | 11:05AM0.30m | 11:49AM0.23m | 12:24PM0.18m | 9:09PM0.50m | 12:56PM0.14m | 10:13PM0.47m | 1:27PM0.12m | 11:04PM0.43m | 1:56PM0.12m | 11:49PM0.40m | |||||||||
— | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — | |
6:40 | — | 6:39 | — | — | 6:39 | — | — | 6:38 | — | — | 6:38 | — | — | 6:38 | — | — | 6:37 | — | |
mm | — | 1 | 5 | 18 | 8 | 13 | 5 | — | 10 | 2 | 2 | 2 | 5 | 2 | 2 | 10 | 2 | 2 | — |
Temp °C | 29 | 30 | 30 | 28 | 28 | 27 | 27 | 29 | 26 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 28 | 28 | 27 |
Feels °C | 32 | 30 | 28 | 25 | 27 | 28 | 28 | 29 | 30 | 28 | 28 | 27 | 28 | 26 | 27 | 28 | 28 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | SW 7 | SW 7 | SW 7 | SW 7 | S 9 | ENE 10 | SW 10 | WSW 10 | WSW 10 | WSW 10 | W 9 | SW 8 | SW 7 | SW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 9 |
16 | 7 | 7 | 2 | 580 | 10 | 1111 | 772 | 720 | 408 | 173 | 67 | 65 | 60 | 109 | 123 | 117 | 188 | 244 | |
Swell 2 Height (m) Direction Period (s) | ENE 12 | E 10 | E 18 | — | ENE 10 | E 16 | ESE 8 | ESE 8 | ESE 7 | ESE 10 | SW 8 | W 8 | SE 10 | W 6 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 |
13 | 7 | 6 | — | 21 | 5 | 322 | 103 | 86 | 42 | 57 | 48 | 26 | 1 | 21 | 20 | 20 | 19 | 19 | |
Swell 3 Height (m) Direction Period (s) | E 10 | SE 10 | — | — | E 16 | NE 10 | ENE 10 | SE 10 | SE 10 | ENE 9 | SE 10 | ESE 10 | W 7 | W 6 | ENE 9 | E 10 | E 16 | ENE 10 | ENE 9 |
8 | 4 | — | — | 5 | 25 | 10 | 24 | 25 | 16 | 25 | 39 | 8 | 1 | 15 | 2 | 5 | 9 | 8 | |
Wind waves Height (m) Direction Period (s) | NE 4 | NE 6 | ENE 7 | ESE 10 | ESE 10 | S 10 | — | — | — | E 5 | ESE 5 | E 5 | ESE 6 | ESE 6 | ESE 6 | SE 6 | ESE 6 | ESE 6 | ESE 6 |
20 | 123 | 538 | 2316 | 1919 | 2783 | — | — | — | 77 | 69 | 70 | 95 | 153 | 119 | 95 | 127 | 90 | 53 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 329 | 693 | 693 | 676 | 148 | 148 | 79 | 79 | 14 | 449 | 859 | 535 | 148 | 511 | 494 | 148 | 494 | 494 | 42 |
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.










