Nanwan Beach (South Bay) Surf Break

Lat Long: 21.96° N 120.76° E

Nanwan Beach (South Bay) Surf Forecast and Surf Report

Issued: 1 am 23 Aug 2026 (local time)

Forecast update in  hr  min

Today's Nanwan Beach (South Bay) sea temperature is
29.1°C
0.2° 

Nanwan Beach (South Bay) surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Nanwan Beach (South Bay) surf forecast from 22 Aug 2026:

  • Best quality surf: Tuesday 25 Aug, 2PM (local time) - 7.5ft (2.3m), 18s period, E swell with cross-offshore winds.
  • Most powerful swell: Tuesday 25 Aug, 5PM (local time) - 8ft (2.4m), 17s period, E swell with 3,434 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 25 Aug, 2PM (local time) - 7.5ft (2.3m), 18s 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 Tuesday (Aug 25) at 2PM. The primary swell is predicted to be 2.3m and 18s period with a secondary swell of 2.3m and 9s. 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 2.4m 17s and forecast to arrive on Tuesday (Aug 25) 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 2.4m 17s period and expected on Tuesday (Aug 25) at 11PM.

Wave TypeTime (CST) & Date Wave Height & Period
Next good surf (1 star+) 2PM (Tue 25th Aug)7.5ft (2.3m) 18s
Best Surf 2PM (Tue 25th Aug)7.5ft (2.3m) 18s
Most Powerful 5PM (Tue 25th Aug)8ft (2.4m) 17s

Table - best surf conditions forecast for Nanwan Beach (South Bay) over the next 16 days.


The Lowdown

G’day, Rusty here. Let’s have a look at what’s cooking for Nanwan Beach (South Bay).

Right now, it’s a bit of a write-off for the next few days. We’ve got strong cross-shore winds and messy conditions, with swell pumping but no quality on offer. The water’s sitting at a warm 84°, which is pretty normal for this time of year.

Sunday (23rd) and Monday (24th) are a no-go – risk of thunderstorms, strong cross-shore breeze, and lumpy cross-chop. The swell’s there at 7ft to 10ft from the SW, period around 8-9 seconds, but the wind’s just wrecking it. Combined energy is moderate to strong (1278 and 1028 on Monday arvo), but it’s not doing anyone any favours. Forget it.

Tuesday (25th) is where things start to get interesting. Morning has a cross-offshore breeze from the WNW at 9 mph, and the swell switches to a long-period easterly groundswell at 18 seconds and 7ft. The energy is massive (3526) – this is strong, powerful stuff. It’s a bit big for beginners at that size, and that long period can make beach breaks close out, but Nanwan is a beach and reef setup, and the wind is clean. Afternoon hammers it home: 8ft E swell, 17-second period, same light cross-off wind, and the wave coment says excellent for experienced surfers. This is the standout of the forecast. Crowds are often a factor here, so expect company, but for the crew that knows what they’re doing, Tuesday arvo is your window. Clean, powerful, and decent shape.

Wednesday (26th) drops off a bit – swell backs down to 6ft-6ft from the SW, period drops to 9 seconds, and the wind stays cross-off but picks up a touch in the afternoon. Energy is moderate (464-559). The morning has ‘good surf conditions’ but the afternoon’s a dud with poor conditions.

From Thursday (27th) through to Monday (31st August), it’s mostly poor. Winds get strong again – up to 31 mph from the WNW on Thursday, and then swinging onshore or cross-shore. The swell is there (5ft to 10ft), but the wind is howling and it’s just messy. A few spots have ‘clean’ wind but the strength makes it unsurfable. Combined energy bounces between moderate and strong (388 to 1331), but it’s not worth your time. Tuesday (1st September) is marginal at best – cross-shore chop with moderate energy.

Now, Wednesday (2nd September) afternoon brings a moment of glass. Light SSW breeze at 3 mph, glassy conditions, 4ft SW swell at 10 seconds. The energy is low (294), but if you want a gentle, clean session, that afternoon could be a sneaky little score. Not a standout, but a calm option.

Then we get to Thursday (3rd September) – and this is another big one, but with a serious caveat. Swell jumps to 13ft from the SW, period 9 seconds, with a clean cross-off WNW breeze at 9-12 mph. The energy is very strong (2248). The forecast says the swell is predicted to be too big for this break. That’s expert territory only – easily double-overhead, and for most, it’s a paddle-out mission you’ll regret. If you’re a charger, it’s there, but honestly, this break isn’t built for that size. I’d give it a miss unless you know the reef inside out.

Friday (4th) and Saturday (5th September) ease off – 8ft down to 7ft SW swell, periods 9-10 seconds, clean cross-off winds. The energy drops to moderate (835-1310). Saturday afternoon is the pick of these two – light breeze, clean, and the wave comment says ‘very good surf conditions’. That’s a solid session for intermediates.

After that, the last few days (6th-7th September) taper away – 4ft to 5ft, moderate cross-off winds but the energy is low and conditions are poor to marginal. The window closes.

So, here’s the bottom line: Tuesday (25th August) afternoon is your best bet – big, long-period easterly groundswell, clean offshore wind, and excellent surf. The other standout is Saturday (5th September) afternoon – smaller but very clean and surfable. The big 13ft day on Thursday (3rd) is only for the brave. Crowds are likely most days, so get in early.

Rusty.

Short Range Forecast

Heavy rain (total 308mm), heaviest during Sun morning. Warm (max 28°C on Mon morning, min 26°C on Sun morning). Winds decreasing (strong winds from the SW on Sun afternoon, calm by Tue night).

Days 4-6 Weather Summary

Moderate rain (total 17mm), heaviest on Wed morning. Warm (max 29°C on Fri morning, min 26°C on Wed morning). Winds increasing (light winds from the WNW on Wed morning, near gales from the W by Thu night).

Sunday
23
Monday
24
Tuesday
25
Wednesday
26
Thursday
27
Friday
28
Saturday
29
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
1
3
5
1
2
0
0
0
0
0
0
1
0
1
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
3
SW
9
2.5
SW
9
2.3
SW
8
2.2
SW
8
2.4
SW
8
2.2
SW
9
2.1
E
18
2.4
E
17
1.8
SW
9
1.7
SW
9
1.8
SW
9
1.8
SW
9
1.6
SW
9
1.6
SW
9
3
WSW
7
3
WSW
8
2.5
SW
9
2.5
SSW
9
2.5
SSW
10
2.4
SSW
10
2.3
SSW
10
Wave Graph
Metric surfscale
Energy kJ
1248
1050
772
687
830
730
2827
3434
564
461
552
519
396
388
700
1175
1099
1104
1326
1146
1042
Wind (km/h)
40
SW
45
SW
40
SW
30
WSW
30
WSW
30
SW
15
WNW
15
WNW
10
WSW
15
W
25
WNW
35
W
45
WNW
50
WNW
55
W
50
W
30
W
15
SSW
15
S
20
E
30
ENE
Wind State
cross
cross
cross
cross
cross
cross
cross-off
cross-off
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-on
on
cross-on
cross
High Tide
3:51AM1.03m
6:41PM0.54m
4:42AM1.09m
6:38PM0.56m
5:24AM1.14m
6:49PM0.59m
6:02AM1.17m
7:06PM0.64m
6:38AM1.18m
7:26PM0.70m
7:13AM1.14m
7:49PM0.76m
Low Tide
11:37AM0.24m
12:05PM0.19m
9:07PM0.52m
12:31PM0.16m
10:17PM0.46m
12:55PM0.14m
11:07PM0.40m
1:18PM0.14m
11:51PM0.35m
1:39PM0.15m
00:35AM0.30m
2:00PM0.18m
1:18AM0.26m
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
mod rain
light rain
thunderstorm
mod rain
light rain
thunderstorm
thunderstorm
part cloud
thunderstorm
part cloud
part cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:37
5:37
5:37
5:37
5:37
5:37
5:39
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:21
6:21
6:20
6:19
6:17
6:16
6:15
 mm
60
48
45
15
66
52
7
3
12
6
1
2
2
1
5
3
3
4
Temp °C
27
27
27
28
26
27
27
27
27
27
27
28
28
28
28
29
29
28
29
29
28
Feels °C
25
25
26
28
25
28
29
30
31
30
28
30
27
25
25
25
28
30
33
32
30
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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