Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 12 Jul 2026:
- Most powerful swell: Monday 13 Jul, 8PM (local time) - 11ft (3.5m), 10s period, SSW swell with 1,957 kJ wave energy.
Best Forecast Surf Conditions for Nanwan Beach (South Bay) this week:
The most powerful waves expected at Nanwan Beach (South Bay) in the next 16 days are 3.5m 10s and forecast to arrive on Monday (Jul 13) at 8PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Sunday (Jul 19) at 8PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Mon 13th Jul) | 11ft (3.5m) 10s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
Alright crew, Rusty here. Let’s break down what’s in store for the next couple of weeks.
Honestly, it’s a tough start. From Monday 13 July all the way through to about Thursday 23 July, it’s a long stretch of ugly. Storms, strong winds blowing onshore or cross-on at 20–35 mph, and the ocean is chopped up and blown out. The wave energy gets up there (2728 on Tuesday afternoon), but it’s useless for paddle surfing – this beach and reef setup is just a mess. Kite surfers might be into it, but for the rest of us, it’s a no-go.
The first real glimmer shows up on Friday 24 July afternoon. The wind finally eases to a light breeze from the west at 3 mph, going cross-offshore, and the report says "clean". That’s your first real window. Swell is 1.8m (about 6ft) from the SW with a 9-second period, and the energy is 538 (moderate). Not big, but clean.
Sunday 26 July keeps it going. A moderate breeze from the NE at 12 mph, cross-offshore, keeps things tidy. Swell holds steady around 1.9m (about 6ft) from the SW, 10-second period, with moderate energy (644–656). It’s not firing, but it’s rideable and clean. That’s your best weekend window.
By Monday 27 July, the wind switches back and the cross-chop returns, so that clean spell is short-lived.
Bottom line: don’t bother paddling out until Friday 24 July afternoon. That afternoon and Sunday 26 July are your only real standouts. The rest is a waiting game.
Hang in there. It won’t stay like this forever.
Rusty.
Short Range ForecastHeavy rain (total 116mm), heaviest during Mon night. Warm (max 29°C on Sun night, min 27°C on Mon night). Mainly fresh winds. | Days 5-7 Weather SummaryHeavy rain (total 70mm), heaviest during Thu night. Warm (max 29°C on Fri morning, min 27°C on Thu night). Winds increasing (light winds from the WSW on Thu night, strong winds from the SE by Fri night). | ||||||||||||||||||||
Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sun 19 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 10 | SSW 10 | SSW 9 | SW 9 | SW 9 | SW 9 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SSW 8 | SSW 8 | SW 9 | SSW 9 | SSW 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 948 | 928 | 1168 | 1644 | 1346 | 1482 | 1422 | 973 | 951 | 699 | 724 | 955 | 596 | 515 | 557 | 362 | 307 | 322 | 357 | 666 | 809 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | on | on | on | cross-on | cross-on | cross | cross | cross | cross | cross | cross-on | on | on | on | cross-on | cross-on | on | cross-on |
High Tide | 5:08AM1.34m | 7:23PM0.52m | 6:01AM1.40m | 8:03PM0.52m | 6:53AM1.42m | 8:40PM0.52m | 7:43AM1.39m | 9:15PM0.55m | 8:31AM1.30m | 9:51PM0.60m | 9:17AM1.17m | 10:28PM0.66m | 10:01AM1.01m | ||||||||
Low Tide | 9:41PM0.45m | 1:03PM-0.05m | 10:38PM0.43m | 1:53PM-0.07m | 11:34PM0.39m | 2:39PM-0.05m | 00:28AM0.36m | 3:21PM0.01m | 1:23AM0.35m | 3:58PM0.09m | 2:21AM0.36m | 4:31PM0.18m | 3:23AM0.39m | 4:57PM0.27m | |||||||
 |  | | | | | | | | | | | | | | |  | | | | | |
 | — | 5:20 | — | — | 5:20 | — | — | 5:22 | — | — | 5:22 | — | — | 5:22 | — | — | 5:22 | — | — | 5:22 | — |
 | 6:43 | — | 6:43 | — | — | 6:43 | — | — | 6:43 | — | — | 6:43 | — | — | 6:42 | — | — | 6:42 | — | — | 6:42 |
mm | 25 | 6 | 5 | 24 | 10 | 7 | 20 | 11 | 8 | 9 | 6 | 6 | 13 | 8 | 6 | 11 | 6 | 5 | 12 | 5 | 43 |
Temp °C | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 28 | 27 |
Feels °C | 30 | 30 | 31 | 30 | 32 | 30 | 30 | 30 | 28 | 29 | 29 | 28 | 30 | 31 | 29 | 28 | 29 | 29 | 28 | 25 | 23 |
Swell 1 Height (m) Direction Period (s) | SE 10 | SSW 9 | E 10 | SSW 10 | SSW 10 | SW 10 | E 9 | SE 6 | SE 6 | SW 9 | E 9 | E 9 | E 10 | E 9 | E 10 | SW 8 | SSW 8 | SSW 8 | SW 9 | SSW 9 | SSW 10 |
| kJ | 150 | 928 | 2 | 1261 | 1346 | 1153 | 7 | 19 | 10 | 699 | 16 | 15 | 18 | 15 | 17 | 362 | 307 | 322 | 357 | 666 | 809 |
Swell 2 Height (m) Direction Period (s) | ESE 8 | SE 9 | SE 8 | SE 8 | SE 7 | SE 7 | SE 7 | E 9 | E 10 | SE 6 | — | — | ENE 9 | — | — | E 10 | ESE 9 | E 9 | SSE 6 | SSE 10 | SSE 7 |
| kJ | 12 | 115 | 154 | 133 | 96 | 86 | 43 | 16 | 17 | 9 | — | — | 8 | — | — | 17 | 17 | 28 | 33 | 38 | 64 |
Swell 3 Height (m) Direction Period (s) | ENE 9 | E 8 | E 10 | — | E 9 | E 9 | E 9 | — | — | E 9 | — | — | — | — | — | — | ENE 10 | E 16 | E 10 | E 10 | SE 10 |
| kJ | 16 | 32 | 8 | — | 7 | 7 | 16 | — | — | 16 | — | — | — | — | — | — | 10 | 5 | 16 | 17 | 27 |
Wind waves Height (m) Direction Period (s) | SSW 9 | — | SSW 9 | SSW 9 | — | SSW 10 | SSW 9 | SW 9 | SW 9 | — | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | — | — | — | E 3 | NE 4 | NE 5 |
| kJ | 948 | — | 1168 | 1644 | — | 1482 | 1422 | 973 | 951 | — | 724 | 955 | 596 | 515 | 557 | — | — | — | 5 | 7 | 43 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 148 | 148 | 14 | 148 | 375 | 375 | 42 | 363 | 348 | 348 | 348 | 996 | 14 | 996 | 363 | 442 | 639 | 676 | 643 | 639 | 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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