Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 16 Sep 2026:
- Best quality surf: Sunday 20 Sep, 2PM (local time) - 2.5ft (0.7m), 10s period, E swell with glassy winds.
- Most powerful swell: Sunday 20 Sep, 2PM (local time) - 2.5ft (0.7m), 10s period, E swell with 92 kJ wave energy.
- Next surfable swell (1★+): Sunday 20 Sep, 2PM (local time) - 2.5ft (0.7m), 10s period with E 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 Sunday (Sep 20) at 2PM. The primary swell is predicted to be 0.7m and 10s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Nanwan Beach (South Bay) in the next 16 days are 0.7m 10s and forecast to arrive on Sunday (Sep 20) at 2PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 7s period and expected on Wednesday (Sep 16) at 2PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Sun 20th Sep) | 2.5ft (0.7m) 10s |
| Best Surf | 2PM (Sun 20th Sep) | 2.5ft (0.7m) 10s |
| Most Powerful | 2PM (Sun 20th Sep) | 2.5ft (0.7m) 10s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Rusty here again. Let’s break it down in feet.
It’s gonna be flat or near-flat for a while. From Wednesday the 16th all the way to Friday the 25th, expect waist-to-knee high waves at best – 0.3ft to 0.6ft – with combined swell energy in the weak range (single digits to 14). Winds are cross-off from the NE, so it’s clean but there’s just no push. A proper dry spell.
Finally, on Saturday the 26th, the morning shows 2.6ft from the east, 12-second period, moderate energy at 294. Light cross-off from the WNW. Clean, fun-sized. But the real deal is Saturday afternoon: 7.2ft from the east, a super-long 15-second groundswell, energy screaming at 2207 (strong). A light offshore from the NW – that’s glassy conditions. For Nanwan Beach (South Bay), a beach and reef setup, that long period can make the beach sections a bit walled, but the reef points should handle it beautifully. This is expert territory – 7.2ft is heavy, and the period is long. Expect crowds, it’s often busy.
Sunday the 27th still has size: 7.9ft east swell with 14-second period, energy at 2441, but the wind is a moderate cross-off from the NW. Still clean, but not as crisp as Saturday. After Sunday afternoon, the swell vanishes. Monday the 28th onwards is back to tiny waves and building wind, culminating in storm-force gusts by the 30th – total mess.
Bottom line: your best bet is Saturday afternoon the 26th. Saturday morning is a clean warm-up. Water temp is 84°, about average for this time of year, so boardshorts are fine.
Short Range ForecastMostly dry. Warm (max 29°C on Fri afternoon, min 25°C on Wed night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Sun morning. Warm (max 28°C on Sat morning, min 25°C on Mon night). Winds increasing (calm on Sun morning, fresh winds from the NE by Mon night). | ||||||||||||||||||||
Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | |||||||||||||||
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) | W 8 | SW 8 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | SE 9 | SSE 9 | SSE 8 | E 10 | E 10 | SSE 8 | SSE 7 | E 11 | SE 10 | SSE 10 | SE 10 | SE 10 | ESE 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2 | 3 | 8 | 8 | 8 | 8 | 7 | 7 | 3 | 7 | 7 | 46 | 66 | 6 | 5 | 2 | 4 | 10 | 4 | 4 | 9 |
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 | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 9:45AM0.61m | 9:30PM1.02m | 10:25AM0.50m | 10:08PM1.00m | 12:04PM0.43m | 10:59PM0.96m | 00:22AM0.93m | 2:05AM0.93m | 3:21AM0.98m | 5:52PM0.59m | 4:14AM1.03m | ||||||||||
Low Tide | 2:28PM0.41m | 5:06AM0.32m | 2:22PM0.43m | 6:41AM0.35m | 9:15AM0.34m | 10:26AM0.29m | 10:59AM0.25m | 11:23AM0.22m | 9:14PM0.53m | ||||||||||||
 | |  | | | | | | | | |  |  |  |  | | | | | | | |
 | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:45 | — | — | 5:45 | — | — | 5:45 | — | — |
 | — | 5:59 | — | — | 5:58 | — | — | 5:57 | — | — | 5:55 | — | — | 5:54 | — | — | 5:53 | — | — | 5:52 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | 2 | — | — | — | — | — | — |
Temp °C | 28 | 28 | 26 | 27 | 28 | 27 | 28 | 29 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 26 | 27 | 28 | 26 |
Feels °C | 27 | 26 | 24 | 26 | 28 | 27 | 28 | 30 | 28 | 29 | 31 | 27 | 33 | 32 | 28 | 28 | 27 | 24 | 26 | 28 | 24 |
Swell 1 Height (m) Direction Period (s) | NW 5 | ENE 16 | ENE 15 | ENE 14 | ENE 14 | ENE 14 | ENE 13 | ENE 13 | ENE 13 | ENE 12 | E 10 | E 10 | E 10 | ENE 13 | ENE 12 | SE 7 | SE 10 | SSE 10 | SE 10 | SE 10 | ESE 10 |
| kJ | 1 | 24 | 44 | 62 | 79 | 115 | 67 | 98 | 65 | 50 | 47 | 46 | 66 | 232 | 379 | 2 | 4 | 10 | 4 | 4 | 9 |
Swell 2 Height (m) Direction Period (s) | SW 7 | SW 8 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | SE 9 | SSE 9 | ENE 12 | ENE 16 | ENE 15 | SSE 8 | SSE 7 | E 11 | SW 7 | E 15 | SW 6 | SW 6 | — |
| kJ | 2 | 2 | 8 | 8 | 8 | 8 | 7 | 7 | 3 | 7 | 56 | 91 | 167 | 6 | 5 | 2 | 2 | 4 | 2 | 1 | — |
Swell 3 Height (m) Direction Period (s) | W 8 | SW 8 | S 10 | NW 5 | SE 9 | SE 8 | SE 10 | SSE 9 | SE 8 | SE 8 | SSE 8 | ENE 12 | ENE 11 | SSE 8 | E 11 | SW 7 | S 6 | — | SW 6 | S 7 | — |
| kJ | 1 | 3 | 2 | 1 | 3 | 3 | 4 | 7 | 3 | 3 | 7 | 28 | 12 | 6 | 2 | 2 | 1 | — | 2 | 1 | — |
Wind waves Height (m) Direction Period (s) | NE 7 | ENE 7 | NE 7 | ENE 6 | ENE 6 | ENE 6 | ENE 5 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | NE 5 | NE 6 | ENE 9 | NE 6 | NE 12 | ENE 12 | NE 12 | ENE 12 | ENE 11 | ENE 6 |
| kJ | 495 | 595 | 489 | 279 | 197 | 216 | 128 | 129 | 162 | 111 | 68 | 60 | 32 | 148 | 111 | 1064 | 1177 | 1148 | 743 | 458 | 176 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 694 | 449 | 329 | 348 | 476 | 316 | 694 | 348 | 329 | 348 | 676 | 348 | 2 | 676 | 348 | 348 | 676 | 316 | 694 | 449 | 316 |
Best forecast wave conditions in South Taiwan | |||||||||||||||||||||
Best forecast wave conditions in Taiwan | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Nanwan Beach (South Bay) surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest