
Surf Forecasts:
Nanwan Beach (South Bay) surf forecast from 14 Jul 2026:
- Most powerful swell: Monday 20 Jul, 2AM (local time) - 11ft (3.5m), 10s period, SW swell with 2,243 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 20) at 2AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 9s period and expected on Thursday (Jul 16) at 5PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Mon 20th Jul) | 11ft (3.5m) 10s |
Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.
The Lowdown
Alright, this is Rusty, checking in with a look at what's shaping up for the next couple of weeks.
Right off the bat, things are looking pretty grim for the first week and a half. We’ve got a solid run of swell, but it’s all getting trashed by some nasty onshore winds. For the first week, from Tuesday the 14th right through to the 21st of July, it’s a write-off. The wind is just a mess, mostly cross or cross-on, with gusts pushing 25 mph at times. The swell is there, with wave energy in the moderate to strong range, but it’s not going to be any fun to paddle into. It’s really more of a kite-surfing setup than a paddle-surfing one. The water is a warm 86°, which is about average for the time of year, but that’s small comfort when the waves are a wind-blown mess.
We finally get a bit of a break from the 22nd to the 24th. The wind goes light and clean, cross-off from the west, but by then the swell has dropped off. The energy is weak, and the waves are just too small to get excited about. It’s surfable, but very ordinary.
Then, there’s a real gap. From the 25th to the 27th, it’s flat and clean, but with barely a ripple. The swell is gone, and the energy is below 100.
Now, the real standout is the 28th of July. That’s when things get interesting. We’ve got a new, clean swell arriving from the east, with a super long period of 16 seconds. That’s proper groundswell energy, and the combined energy is strong. The wind is offshore, light and clean from the north-northwest. This is a setup that’s going to produce some really good, clean waves. The only catch is that with such a long period, it might break a bit straight at the beach, so the best shape will be on the reef and point sections at Nanwan Beach (South Bay). This is the one to keep an eye on. The swell size is around 4ft with the offshore wind, so it’s a good size for intermediates and up.
The following day, the 29th, the swell picks up to 7ft to 8ft, with even more energy, but the wind gets a lot stronger, up to 25 mph. The wave comment says it’s questionable, so it’s going to be a lot more challenging. That’s one for the experts only, and even then, it’s going to be a handful.
So, to wrap it up: the first week is a total loss. The 22nd to the 24th is small and clean, a good day for a longboard. The 28th of July is the one to circle on the calendar. That’s your best bet for a quality session. Get ready for that one.
Rusty.
Short Range ForecastHeavy rain (total 98mm), heaviest during Tue night. Warm (max 29°C on Tue afternoon, min 27°C on Thu night). Winds increasing (light winds from the SW on Tue night, fresh winds from the SW by Thu night). | Days 4-6 Weather SummaryHeavy rain (total 99mm), heaviest during Sat morning. Warm (max 28°C on Fri morning, min 27°C on Fri afternoon). Mainly strong winds. | ||||||||||||||||||||
Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 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) | SSW 10 | SW 10 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 9 | S 8 | SSW 8 | SW 10 | SW 9 | SW 9 | SW 9 |
Wave Graph | |||||||||||||||||||||
963 | 1100 | 931 | 626 | 790 | 595 | 529 | 505 | 507 | 611 | 699 | 886 | 593 | 470 | 1050 | 756 | 1242 | 2243 | 1521 | 1874 | 1172 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | cross-on | cross | cross-off | cross | cross | cross | cross-on | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross |
High Tide | 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 | 11:08PM0.73m | 10:46AM0.84m | 11:52PM0.80m | ||||||||
Low Tide | 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 | 4:34AM0.43m | 5:18PM0.34m | ||||||||
5:20 | — | — | 5:22 | — | — | 5:22 | — | — | 5:22 | — | — | 5:22 | — | — | 5:22 | — | — | 5:24 | — | — | |
— | 6:43 | — | — | 6:43 | — | — | 6:43 | — | — | 6:42 | — | — | 6:42 | — | — | 6:42 | — | — | 6:42 | — | |
mm | 5 | 7 | 26 | 11 | 13 | 12 | 6 | 5 | 13 | 6 | 8 | 15 | 13 | 8 | 11 | 9 | 8 | 21 | 4 | 5 | 9 |
Temp °C | 28 | 29 | 28 | 29 | 29 | 28 | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 31 | 31 | 31 | 31 | 31 | 30 | 31 | 31 | 29 | 28 | 27 | 29 | 29 | 29 | 28 | 28 | 27 | 27 | 27 | 27 | 31 |
Swell 1 Height (m) Direction Period (s) | SSW 10 | SE 7 | SW 9 | SW 9 | E 10 | SW 9 | E 9 | E 10 | E 9 | E 9 | E 10 | E 10 | SW 8 | E 10 | E 10 | WSW 8 | E 10 | E 10 | E 10 | E 10 | ENE 10 |
963 | 71 | 931 | 626 | 16 | 595 | 28 | 18 | 25 | 24 | 30 | 17 | 593 | 17 | 17 | 243 | 8 | 7 | 8 | 8 | 9 | |
Swell 2 Height (m) Direction Period (s) | SE 7 | E 9 | SE 6 | SE 6 | E 9 | E 9 | — | ENE 9 | ENE 9 | — | — | — | E 10 | — | E 13 | E 10 | ESE 9 | — | ESE 9 | ESE 9 | ESE 9 |
96 | 7 | 32 | 17 | 16 | 15 | — | 8 | 8 | — | — | — | 17 | — | 3 | 8 | 8 | — | 8 | 8 | 7 | |
Swell 3 Height (m) Direction Period (s) | E 9 | — | E 9 | E 9 | — | SE 5 | — | — | — | — | — | — | E 14 | — | — | E 13 | E 13 | — | — | — | E 12 |
7 | — | 7 | 16 | — | 6 | — | — | — | — | — | — | 4 | — | — | 3 | 3 | — | — | — | 3 | |
Wind waves Height (m) Direction Period (s) | — | SW 10 | — | — | SW 9 | — | SW 9 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | — | SW 8 | SW 9 | S 8 | SSW 8 | SW 10 | SW 9 | SW 9 | SW 9 |
— | 1100 | — | — | 790 | — | 529 | 505 | 507 | 611 | 699 | 886 | — | 470 | 1050 | 756 | 1242 | 2243 | 1521 | 1874 | 1172 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 375 | 363 | 14 | 14 | 348 | 14 | 14 | 676 | 348 | 639 | 348 | 348 | 1464 | 363 | 363 | 541 | 935 | 375 | 1482 | 348 | 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.










