Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 13 Sep 2026:
- Most powerful swell: Sunday 20 Sep, 5AM (local time) - 3.5ft (1.1m), 16s period, E swell with 651 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 1.1m 16s and forecast to arrive on Sunday (Sep 20) 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 2.4m 7s period and expected on Tuesday (Sep 15) at 8PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5AM (Sun 20th Sep) | 3.5ft (1.1m) 16s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s get into it, mate.
Honestly, for Nanwan Beach (South Bay) it’s a pretty bleak run for a while. We’ve got a long gap with barely a ripple for over a week starting now – Sunday the 13th September right through to Friday the 25th September – all reading “poor surf conditions.” The wind hangs in from the NE pretty much the whole time, cross-off, but the swell is tiny, mostly 0.3ft to 2ft, with weak combined energy readings (mostly below 70, often under 20). You’d be better off having a cold one than paddling out, to be honest.
Now, the water temp is sitting at 84°F at the start, with a +0.5°F anomaly – so bang on average for this time of year, no surprises there.
The only real glimmer on the horizon lands right at the end of the outlook, around Saturday the 26th and into Sunday the 27th September. On the 26th, we see a proper pulse of swell arriving – 5ft to 6ft from the east, with a long period of 16 seconds. That’s a solid groundswell, carrying some serious energy. The combined energy jumps right up to 1112 on the Saturday morning, and then a hefty 1629 by the afternoon. That’s strong wave energy, no doubt. Wind is still cross-off from the NE, around 18 to 22 mph, but the surf will be holding some size.
This is where Nanwan Beach (South Bay) could actually offer something. It’s a beach and reef setup, fairly exposed, and the optimum swell direction is SE, so this easterly swell will get in there. The long period will favour the reef sections, giving better shape, but it might be a bit straight for the beach, so look for the points. This swell gets up to 7ft on the Sunday morning, which is getting serious – only for experienced surfers. But the energy is huge (2146) and the period is 15 seconds, so it’s a powerful, clean groundswell. Sunday afternoon drops right off again, so the highlight is Saturday the 26th and Sunday morning the 27th. That’s the one window worth chasing. Crowds are often here, so expect company if the surf fires.
Stay keen, check the charts again closer to the date – long-range calls are a bit less certain.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Tue afternoon. Warm (max 29°C on Sun morning, min 26°C on Mon night). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 29°C on Thu afternoon, min 27°C on Wed morning). Mainly fresh winds. | ||||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | |||||||||||||||
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) | SSW 7 | SSW 7 | SW 8 | SW 8 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 8 | SW 8 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | E 9 | ESE 9 | ESE 8 | ENE 19 | E 17 |
Wave Graph  | |||||||||||||||||||||
 kJ | 19 | 19 | 31 | 28 | 19 | 7 | 8 | 9 | 2 | 3 | 2 | 8 | 8 | 8 | 8 | 7 | 61 | 8 | 7 | 0 | 454 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore 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 | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 8:04PM0.95m | 8:33AM0.86m | 8:31PM1.00m | 9:09AM0.73m | 8:59PM1.02m | 9:45AM0.61m | 9:30PM1.02m | 10:25AM0.50m | 10:08PM1.00m | 12:04PM0.43m | 10:59PM0.96m | 00:22AM0.93m | |||||||||
Low Tide | 2:02PM0.28m | 2:23AM0.20m | 2:15PM0.33m | 3:11AM0.23m | 2:24PM0.38m | 4:03AM0.27m | 2:28PM0.41m | 5:06AM0.32m | 2:22PM0.43m | 6:41AM0.35m | 9:15AM0.34m | ||||||||||
 | |  | | | | |  |  | | | | | | | | | | | |  | |
 | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — |
 | — | 6:01 | — | — | 6:00 | — | — | 6:00 | — | — | 5:59 | — | — | 5:58 | — | — | 5:57 | — | — | 5:55 | — |
mm | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 29 | 29 | 28 | 29 | 29 | 27 | 28 | 29 | 27 | 28 | 28 | 27 | 28 | 29 | 27 | 29 | 29 | 27 | 29 | 29 | 27 |
Feels °C | 30 | 30 | 29 | 30 | 31 | 27 | 27 | 29 | 26 | 26 | 27 | 26 | 27 | 29 | 28 | 30 | 30 | 27 | 31 | 31 | 28 |
Swell 1 Height (m) Direction Period (s) | E 14 | E 14 | SW 8 | E 14 | E 13 | E 13 | E 13 | SW 7 | E 12 | E 12 | ENE 16 | ENE 15 | ENE 14 | ENE 14 | ENE 14 | ENE 13 | E 9 | ENE 13 | ENE 12 | E 9 | E 17 |
| kJ | 103 | 98 | 31 | 101 | 92 | 90 | 87 | 9 | 80 | 75 | 24 | 44 | 63 | 79 | 115 | 67 | 61 | 65 | 56 | 39 | 454 |
Swell 2 Height (m) Direction Period (s) | SSW 7 | SSW 7 | E 14 | SW 8 | SW 7 | SW 7 | SW 7 | WSW 7 | NNW 7 | SW 7 | SW 8 | NNW 6 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ENE 13 | ESE 9 | ESE 8 | ENE 12 | ENE 12 |
| kJ | 19 | 19 | 101 | 28 | 19 | 7 | 8 | 5 | 4 | 2 | 2 | 4 | 8 | 8 | 8 | 7 | 98 | 8 | 7 | 56 | 82 |
Swell 3 Height (m) Direction Period (s) | ESE 10 | ESE 10 | NW 5 | N 6 | NW 6 | NW 5 | SW 8 | — | SW 7 | SW 8 | NW 6 | ESE 9 | NW 5 | SE 9 | SE 8 | SE 8 | ESE 9 | SE 8 | SE 8 | ENE 19 | SE 8 |
| kJ | 9 | 9 | 1 | 1 | 1 | 1 | 3 | — | 2 | 3 | 1 | 8 | 1 | 3 | 3 | 3 | 7 | 2 | 2 | 124 | 2 |
Wind waves Height (m) Direction Period (s) | ENE 5 | ENE 5 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 6 | NE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 6 | ENE 5 | ENE 5 | ENE 5 | ENE 9 | ENE 5 | ENE 9 | ENE 5 | ENE 5 | NE 6 |
| kJ | 52 | 61 | 148 | 164 | 211 | 324 | 223 | 467 | 342 | 268 | 444 | 254 | 140 | 128 | 109 | 280 | 44 | 216 | 63 | 48 | 154 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 451 | 497 | 329 | 348 | 476 | 348 | 476 | 449 | 329 | 694 | 450 | 316 | 845 | 845 | 316 | 694 | 676 | 316 | 694 | 676 | 348 |
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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