
Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 23 Jul 2026:
- Best quality surf: Saturday 25 Jul, 5PM (local time) - 11ft (3.5m), 10s period, SSE swell with cross-shore winds.
- Most powerful swell: Wednesday 29 Jul, 5AM (local time) - 13ft (4.0m), 9s period, SE swell with 2,632 kJ wave energy.
- Next surfable swell (1★+): Saturday 25 Jul, 5PM (local time) - 11ft (3.5m), 10s period with SSE 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 3.5m and 10s period with a secondary swell of 2.5m and 10s. Another secondary swell of 2.3m and 9s is also forecast. 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 9s and forecast to arrive on Wednesday (Jul 29) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 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) | 11ft (3.5m) 10s |
| Best Surf | 5PM (Sat 25th Jul) | 11ft (3.5m) 10s |
| Most Powerful | 5AM (Wed 29th Jul) | 13ft (4.0m) 9s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, this is Rusty. Let's talk about what we've got on the cards for the coming weeks.
To be brutally honest, the next 16 days are looking like a write-off for a proper paddle session. The conditions are just not cooperating. There's a massive gap of flat, messy, or blown-out days ahead. We've got a couple of tiny windows where the swell shows up, but the wind is a relentless enemy, and the quality is just not there. It's one of those periods where the forecast looks more interesting for a kite surfer than anyone with a paddle, given the strong cross-shore winds and significant swell at times.
The only break on the radar is Nanwan Beach (South Bay). This is a beach and reef setup, fairly exposed to the south-east, but it's inconsistent throughout this entire outlook. The water temperature is sitting at a warm 85.1°, which is about average for the time of year here.
The first potential day is Saturday, July 25th. There's a big pulse of swell coming in, with a 11.5 ft swell from the ESE, but it's a short period of 9 seconds. The combined energy is massive (2090), but the wind is a strong 25 mph cross-shore from the ENE, creating a messy cross-chop. It's a no-go for a safe, clean surf. The afternoon gets a bit better with the wind easing, but the swell is still too big for this break, and the tide/wind combo is still not favorable for a good paddle.
Sunday, July 26th, and Monday, July 27th, are still rough, with strong cross-shore winds and lumpy conditions. The swell drops but the wind remains a problem. The pattern continues through the next week. We see a couple of days with S/SSW swells, but the wind is consistently cross-shore or onshore, keeping the waves choppy and messy. The swell energy is generally moderate (between 300 and 600), but the wind is the spoiler.
The last glimmer of hope is on Thursday, August 6th. The wind swings to the west, becoming a clean cross-offshore at 28 mph. The swell is a solid 9.8 ft from the SSW, with a period of 10 seconds, and the combined energy is strong (2129). However, it's still a massive, powerful swell that is only for experts, and the strong wind, while clean, makes it a challenging, high-risk session. The following day, Friday, August 7th, is similar, but the forecast is marginal at best.
So, there you have it. A long, frustrating run of poor conditions. Don't get your hopes up just yet. This is one of those stretches where the ocean just isn't playing ball. Keep your board waxed, though. Forecasts can change.
Short Range ForecastHeavy rain (total 70mm), heaviest during Sat night. Warm (max 30°C on Fri morning, min 25°C on Sat night). Winds increasing (calm on Thu afternoon, strong winds from the NE by Fri night). | Days 5-7 Weather SummaryHeavy rain (total 83mm), heaviest during Wed morning. Warm (max 29°C on Mon afternoon, min 25°C on Wed morning). Mainly strong winds. | |||||||||||||||||||
Thu 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | ||||||||||||||
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 9 | ESE 9 | SSE 10 | SW 10 | SW 10 | WSW 10 | WSW 9 | E 6 | E 6 | E 6 | ESE 7 | SE 8 | SE 9 | SE 9 | SE 8 | SSW 9 |
Wave Graph | ||||||||||||||||||||
23 | 16 | 12 | 7 | 1587 | 2083 | 2488 | 992 | 723 | 511 | 280 | 154 | 162 | 247 | 394 | 452 | 1611 | 1655 | 878 | 227 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-off | cross-off | cross-off | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 3:19PM0.48m | 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 | 5:47PM0.47m | 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 | — | — | — | 3 | 13 | 7 | 15 | 30 | 2 | 5 | 9 | 5 | 2 | 5 | 6 | 10 | 15 | 26 | 32 | 17 |
Temp °C | 29 | 29 | 30 | 30 | 28 | 27 | 27 | 26 | 28 | 28 | 27 | 28 | 29 | 28 | 28 | 28 | 28 | 25 | 25 | 27 |
Feels °C | 33 | 32 | 31 | 29 | 25 | 25 | 27 | 29 | 28 | 28 | 28 | 26 | 27 | 27 | 26 | 28 | 27 | 23 | 23 | 25 |
Swell 1 Height (m) Direction Period (s) | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SSW 10 | SW 10 | SW 10 | WSW 10 | WSW 9 | W 9 | SW 8 | SW 8 | SW 8 | SW 9 | SW 9 | SW 9 | SSW 9 | SSW 9 |
23 | 16 | 12 | 7 | 2 | 2 | 1201 | 992 | 723 | 511 | 280 | 139 | 45 | 46 | 29 | 84 | 81 | 93 | 133 | 227 | |
Swell 2 Height (m) Direction Period (s) | ENE 9 | ENE 12 | E 10 | NW 4 | E 17 | E 16 | ESE 9 | ESE 8 | SE 8 | ESE 7 | SE 10 | SW 7 | W 9 | ESE 10 | E 11 | — | ENE 8 | E 16 | E 16 | SSE 7 |
16 | 13 | 7 | 1 | 6 | 5 | 878 | 322 | 69 | 102 | 28 | 44 | 54 | 20 | 2 | — | 7 | 5 | 5 | 115 | |
Swell 3 Height (m) Direction Period (s) | E 10 | E 10 | SE 10 | E 18 | — | — | SSE 9 | ENE 10 | ESE 10 | SE 10 | E 15 | SE 10 | SE 10 | W 7 | — | — | — | — | — | E 16 |
8 | 8 | 4 | 6 | — | — | 199 | 19 | 38 | 25 | 4 | 25 | 25 | 9 | — | — | — | — | — | 5 | |
Wind waves Height (m) Direction Period (s) | — | ENE 4 | NE 5 | ENE 7 | E 9 | ESE 9 | SSE 10 | — | ENE 4 | — | E 5 | E 6 | E 6 | E 6 | ESE 7 | SE 8 | SE 9 | SE 9 | SE 8 | E 5 |
— | 17 | 110 | 482 | 1587 | 2083 | 2488 | — | 46 | — | 104 | 154 | 162 | 247 | 394 | 452 | 1611 | 1655 | 878 | 51 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 79 | 329 | 693 | 676 | 591 | 148 | 148 | 79 | 148 | 378 | 148 | 449 | 449 | 148 | 511 | 148 | 378 | 451 | 378 | 494 |
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.










