Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 17 Jul 2026:
- Best quality surf: Monday 20 Jul, 5AM (local time) - 4.5ft (1.4m), 7s period, SW swell with cross-offshore winds.
- Most powerful swell: Friday 17 Jul, 5PM (local time) - 5ft (1.6m), 8s period, SW swell with 276 kJ wave energy.
- Next surfable swell (1★+): Monday 20 Jul, 5AM (local time) - 4.5ft (1.4m), 7s period with SW 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 Monday (Jul 20) at 5AM. The primary swell is predicted to be 1.4m and 7s period with a secondary swell of 0.3m and 10s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Nanwan Beach (South Bay) in the next 16 days are 1.6m 8s and forecast to arrive on Friday (Jul 17) at 5PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 11s period and expected on Friday (Jul 24) at 8AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Mon 20th Jul) | 4.5ft (1.4m) 7s |
| Best Surf | 5AM (Mon 20th Jul) | 4.5ft (1.4m) 7s |
| Most Powerful | 5PM (Fri 17th Jul) | 5ft (1.6m) 8s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's on the cards for the next couple of weeks.
To be straight with you, the outlook for Nanwan Beach (South Bay) is a tough one. The entire 16-day window is a bit of a struggle, with the forecast calling for poor surf conditions from start to finish. The models are showing a lot of onshore wind – steady cross-off winds from the west, mostly in the 12 to 19 mph range, which just isn't going to do the surf any favours. The water’s sitting at 85.6°, which is about average for the time of year, so at least bumps and boardies are the go.
We kick off Friday the 17th with a bit of a pulse, around 5ft of SW swell, but it's short-period stuff at 8 seconds and the wind is up. The combined energy is in the moderate range at 293, but the call is poor surf. That theme continues right through the next week. The swell drops off steadily, getting down to barely 1.6ft by Sunday the 26th, with wave energy dropping to just 52. It's a proper flat spell.
Now, late on Monday the 27th, there's a spike in the numbers. The wind picks up to a near gale from the WNW at 31 mph, and we see a jump in the swell height to 5.6ft from the east, with a very long period of 14 seconds. That gives a combined energy of 1162, which is strong. But it's still being called poor surf conditions. The wind is cross-off, but at that strength it's going to be messy and blown out, and that long period E swell is going to be hard to handle at a beach and reef setup. This one is a pass for paddle surfing, honestly, it looks more interesting for kite surfing than anything else.
The week after that, from the 28th of July into early August, the swell tries to build again, with another 5.9ft pulse from the SSW on Friday the 31st, but the wind is still a solid 19 mph cross-off. It's the same story – poor conditions. The whole run is a washout. There's no standout day, no hidden gem. The consistent onshore wind and the prevailing poor surf quality just kill any chance of a good one. If you're desperate for a paddle, maybe a dawny on the 24th when the wind drops to a glassy 3 mph, but the swell is only 2.3ft. It's a tough block.
Stay patient, boys and girls. The forecast can always change.
Short Range ForecastModerate rain (total 13mm), heaviest on Fri morning. Warm (max 29°C on Fri morning, min 27°C on Sun night). Mainly fresh winds. | Days 4-6 Weather SummaryModerate rain (total 12mm), heaviest on Mon morning. Warm (max 29°C on Mon afternoon, min 27°C on Mon morning). Wind will be generally light. | ||||||||||||||||||||
Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | |||||||||||||||
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 8 | SW 8 | SW 8 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | WSW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 270 | 276 | 269 | 244 | 209 | 234 | 211 | 254 | 193 | 168 | 121 | 102 | 115 | 100 | 67 | 75 | 62 | 49 | 54 | 65 | 57 |
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 | cross | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | glassy |
High Tide | 8:31AM1.30m | 9:51PM0.60m | 9:17AM1.17m | 10:28PM0.66m | 10:01AM1.01m | 11:08PM0.73m | 10:46AM0.84m | 11:52PM0.80m | 11:37AM0.68m | 00:40AM0.86m | 12:53PM0.55m | 1:33AM0.92m | 3:19PM0.48m | 2:28AM0.96m | |||||||
Low Tide | 3:58PM0.09m | 2:21AM0.36m | 4:31PM0.18m | 3:23AM0.39m | 4:57PM0.27m | 4:34AM0.43m | 5:18PM0.34m | 6:03AM0.46m | 5:34PM0.40m | 7:58AM0.44m | 5:44PM0.44m | 9:54AM0.38m | 5:47PM0.47m | ||||||||
 | |  |  | | | | |  | | | | | |  | | | | | | | |
 | 5:22 | — | — | 5:22 | — | — | 5:22 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — |
 | — | 6:42 | — | — | 6:42 | — | — | 6:42 | — | — | 6:42 | — | — | 6:40 | — | — | 6:40 | — | — | 6:40 | — |
mm | 3 | 3 | 1 | — | 2 | 2 | — | — | 2 | 4 | — | 2 | 5 | 1 | — | — | — | — | — | — | — |
Temp °C | 29 | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 |
Feels °C | 31 | 30 | 29 | 30 | 30 | 30 | 30 | 29 | 29 | 28 | 29 | 31 | 32 | 30 | 33 | 33 | 31 | 33 | 33 | 31 | 34 |
Swell 1 Height (m) Direction Period (s) | E 9 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | SW 7 | E 10 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 8 |
| kJ | 23 | 29 | 30 | 17 | 17 | 16 | 17 | 17 | 193 | 17 | 121 | 102 | 115 | 100 | 67 | 75 | 62 | 49 | 54 | 65 | 57 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | E 13 | E 13 | SE 9 | ESE 9 | E 10 | ESE 9 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 11 |
| kJ | — | — | — | — | 3 | 3 | 3 | 7 | 17 | 8 | 19 | 18 | 18 | 18 | 18 | 17 | 17 | 17 | 16 | 16 | 24 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | E 13 | E 13 | ESE 8 | — | ESE 9 | ESE 8 | ESE 8 | ESE 8 | SE 8 | SE 8 | E 9 | SE 8 | E 10 | ENE 12 | ENE 9 |
| kJ | — | — | — | — | — | — | 3 | 3 | 7 | — | 8 | 7 | 7 | 6 | 3 | 2 | 7 | 2 | 8 | 15 | 8 |
Wind waves Height (m) Direction Period (s) | SW 8 | SW 8 | SW 8 | SW 8 | SW 7 | SW 7 | SW 7 | SW 7 | — | WSW 7 | — | — | — | — | — | — | W 3 | — | — | — | — |
| kJ | 270 | 276 | 269 | 244 | 209 | 234 | 211 | 254 | — | 168 | — | — | — | — | — | — | 1 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 693 | 996 | 348 | 861 | 922 | 42 | 859 | 859 | 2 | 863 | 922 | 2 | 14 | 922 | 2 | 922 | 861 | 2 | 2 | 2 | 2 |
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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