Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 14 Sep 2026:
- Most powerful swell: Sunday 20 Sep, 2AM (local time) - 3.5ft (1.1m), 17s period, E swell with 742 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 17s and forecast to arrive on Sunday (Sep 20) at 2AM. 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 Wednesday (Sep 16) at 2PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Sun 20th Sep) | 3.5ft (1.1m) 17s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, let’s just be honest here: the next week and a half at Nanwan Beach (South Bay) is going to be a grind. There’s basically nothing on offer. You’re looking at flat spells and a few tiny, unrideable bumps. The wind will be mostly cross-off or offshore, which is nice, but with no swell, it doesn’t matter. You’ll see a glassy arvo on Monday the 21st, but the ocean is flat as a pancake. It’s a real test of patience.
But things start to stir on Thursday the 24th. We get a small 3ft wave at 5 seconds in the morning. It’s not much, but it’s something. Then Saturday the 26th arvo is the real wake-up call. The swell jumps to 5ft at 12 seconds from the ESE, and you can feel the energy coming. That’s the first sign that things are about to get interesting.
Now, Sunday the 27th is the big one, but it’s too big for this spot. We’re talking 13ft of pure ESE swell with a 12-second period. The energy readings are massive – 4963 in the morning and 6393 in the afternoon. That’s a lot of water moving, and for a beach and reef break, it’s going to be closing out and messy. Unless you’re an absolute charger, you’re better off watching this one from the shore. The offshore wind in the morning would be perfect, but the size is just overwhelming for this break.
Monday the 28th is where it gets good. The swell drops to a more manageable 8ft from the SSW with an 11-second period. The morning is the pick, with light NNE winds and clean conditions. The energy is still strong at 2055, so there’s plenty of push. That’s the standout session of the whole forecast. The arvo gets a bit messy with rain showers and a moderate breeze, so get on it early.
Tuesday the 29th is similar, around 8ft from the SW, but the wind goes more cross-on with the ESE in the arvo, and the energy drops a bit to 1129-1408. It’s still rideable, but not as clean as Monday morning.
So, if you want the best surf, point your board at Monday the 28th morning. That’s the one. Sunday is for the experts only, but honestly, it’s just too big for this spot. The rest is all about waiting.
Water temp is around 84°, which is about average for this time of year, so no surprises there.
Alright, that’s the story. Stay patient, and be ready for that Monday morning session. This is Rusty, signing off.
Short Range ForecastSome drizzle, heaviest during Tue afternoon. Warm (max 29°C on Mon morning, min 26°C on Wed night). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 29°C on Thu afternoon, min 26°C on Sat night). Mainly fresh winds. | ||||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | |||||||||||||||
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 7 | SW 7 | SW 8 | WSW 8 | SW 7 | W 8 | SW 8 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | E 9 | ESE 9 | E 9 | E 13 | E 17 | ENE 16 | ENE 17 | ENE 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 28 | 19 | 8 | 3 | 6 | 2 | 2 | 2 | 8 | 8 | 8 | 8 | 7 | 63 | 7 | 61 | 32 | 742 | 0 | 0 | 0 |
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 | 8:33AM0.86m | 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 | 2:05AM0.93m | |||||||||
Low Tide | 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 | 10:26AM0.29m | |||||||||||
 | |  | |  | | | | | | | | | | | |  |  |  | |  | |
 | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:45 | — | — |
 | — | 6:00 | — | — | 6:00 | — | — | 5:59 | — | — | 5:58 | — | — | 5:57 | — | — | 5:55 | — | — | 5:54 | — |
mm | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 29 | 29 | 27 | 28 | 29 | 27 | 28 | 28 | 27 | 28 | 29 | 27 | 29 | 29 | 27 | 28 | 28 | 27 | 27 | 28 | 27 |
Feels °C | 28 | 29 | 27 | 26 | 28 | 26 | 26 | 27 | 27 | 27 | 29 | 28 | 30 | 32 | 28 | 29 | 30 | 27 | 29 | 30 | 28 |
Swell 1 Height (m) Direction Period (s) | E 14 | E 13 | E 13 | SW 7 | WSW 8 | E 12 | NW 5 | ENE 16 | ENE 15 | ENE 14 | ENE 14 | ENE 14 | ENE 13 | E 9 | ENE 13 | E 9 | E 19 | E 17 | ENE 16 | ENE 17 | ENE 16 |
| kJ | 101 | 92 | 90 | 2 | 6 | 80 | 1 | 24 | 44 | 62 | 79 | 115 | 67 | 63 | 95 | 61 | 188 | 742 | 2110 | 1688 | 1968 |
Swell 2 Height (m) Direction Period (s) | SW 8 | SW 7 | SW 7 | SW 8 | WSW 8 | NNW 7 | SW 7 | SW 8 | NNW 6 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ENE 13 | ESE 9 | ENE 12 | ENE 12 | ENE 10 | NE 16 | — | — |
| kJ | 28 | 19 | 8 | 3 | 6 | 4 | 2 | 2 | 4 | 8 | 8 | 8 | 7 | 98 | 7 | 50 | 56 | 35 | 11 | — | — |
Swell 3 Height (m) Direction Period (s) | — | NW 5 | NW 6 | SW 8 | — | SW 7 | W 8 | N 9 | ESE 9 | NW 5 | SE 9 | SE 8 | SE 10 | ESE 9 | SE 8 | E 20 | E 13 | SE 8 | — | — | — |
| kJ | — | 1 | 1 | 3 | — | 2 | 1 | 2 | 8 | 1 | 3 | 3 | 4 | 7 | 3 | 31 | 32 | 2 | — | — | — |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | NE 7 | ENE 7 | ENE 7 | NE 7 | ENE 6 | ENE 6 | ENE 5 | ENE 5 | ENE 5 | ENE 5 | ENE 5 | NE 5 | ENE 5 | NE 6 | NE 7 | NE 6 | NE 6 |
| kJ | 304 | 342 | 431 | 493 | 495 | 383 | 380 | 495 | 262 | 151 | 123 | 105 | 109 | 46 | 98 | 62 | 83 | 147 | 189 | 147 | 96 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 348 | 676 | 348 | 694 | 676 | 329 | 476 | 348 | 329 | 694 | 676 | 329 | 694 | 676 | 348 | 694 | 676 | 348 | 442 | 2 | 449 |
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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