Nanwan Beach (South Bay) Surf Break

Lat Long: 21.96° N 120.76° E

Nanwan Beach (South Bay) Surf Forecast and Surf Report

Issued: 7 pm 19 Aug 2026 (local time)

Forecast update in  hr  min

Today's Nanwan Beach (South Bay) sea temperature is
29.1° C
0.1° 

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 19 Aug 2026:

  • Best quality surf: Thursday 20 Aug, 5PM (local time) - 8ft (2.4m), 9s period, SW swell with cross-offshore winds.
  • Most powerful swell: Friday 21 Aug, 5PM (local time) - 10ft (3.0m), 10s period, SW swell with 1,480 kJ wave energy.
  • Next surfable swell (1★+): Thursday 20 Aug, 5PM (local time) - 8ft (2.4m), 9s 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 Thursday (Aug 20) at 5PM. The primary swell is predicted to be 2.4m and 9s period. 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 3.0m 10s and forecast to arrive on Friday (Aug 21) 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 2.1m 9s period and expected on Monday (Aug 24) at 8PM.

Wave TypeTime (CST) & Date Wave Height & Period
Next good surf (1 star+) 5PM (Thu 20th Aug)8ft (2.4m) 9s
Best Surf 5PM (Thu 20th Aug)8ft (2.4m) 9s
Most Powerful 5PM (Fri 21st Aug)10ft (3.0m) 10s

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


The Lowdown

Alright folks, Rusty here. Let’s get into it for Nanwan Beach (South Bay). We’ve got a decent pulse of swell, but the wind is going to be the main character in this story, so we’ll need to pick our windows carefully.

The water’s sitting at a warm 84°, which is pretty much spot on for this time of year, so no surprises there.

The first real shot of surfable waves comes in on Thursday morning, August 20th. We’ve got a 8ft swell from the SW, with a 9-second period. The combined energy is already up there at 913 (moderate energy), and with a light 10 km/h WNW breeze keeping it cross-offshore, the conditions will be clean. This is a solid, fun-sized day for an intermediate surfer. The swell ticks up through Thursday afternoon into Friday, but the wind gets rowdy. Friday morning, August 21st, sees the swell peak at 10ft from the SW, with a 10-second period and a massive 1912 combined energy (strong wave energy). However, the wind is a fresh 35 km/h from the W, making it a tough, bumpy session. That size is pushing into expert-only territory, and the quality is marginal.

The standout window, and I mean the real gem in this 16-day run, is Wednesday, August 26th. The swell holds at 6ft to 7ft from the East, with a 16-second period. That’s a very long period groundswell, which will wrap beautifully into this beach-and-reef setup, offering well-shaped, powerful lines. The combined energy is a whopping 2279 to 2633 (strong wave energy). The wind goes light and variable—10 to 15 km/h from the NE, keeping it cross-offshore and clean. This is excellent surf for experienced surfers. The long period means longer waits between sets, but the paddle-out will be easier, and the waves will be worth the patience.

Thursday, August 27th, is also a treat. The morning starts glassy with a 5 km/h WSW breeze, and the swell is 5ft from the SW. By the afternoon, the wind drops to absolute calm (0 km/h), glassy conditions, with the swell picking up to 6ft. That’s a beautiful, clean day for a more relaxed session.

After that, the wind becomes a problem. From Friday, August 28th, through the end of the run, the wind is onshore or cross-shore, and the swell drops off. The last week of August and into September sees poor surf conditions with weak, choppy waves. We’re looking at a long gap of at least 5 to 6 days of flat, wind-blown junk.

So, to sum it up: Thursday the 20th is a solid, clean start. But the absolute best is Wednesday the 26th and Thursday the 27th. That’s your window for the best quality, cleanest waves. Get out there.

Rusty.

Short Range Forecast

Heavy rain (total 101mm), heaviest during Fri morning. Warm (max 28°C on Wed night, min 26°C on Thu afternoon). Mainly fresh winds.

Days 5-7 Weather Summary

Heavy rain (total 84mm), heaviest during Sun morning. Warm (max 29°C on Sun afternoon, min 27°C on Sat night). Wind will be generally light.

Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
2
3
0
1
2
2
1
1
2
3
3
2
0
1
2
3
2
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2.4
SSW
9
2.4
SW
9
2.4
SW
9
2.5
SW
9
2.5
SW
9
3
SW
10
3
SW
10
2.5
SW
10
2.4
SW
10
2.3
SW
9
2.5
SW
9
2.4
SW
9
2.2
SW
9
2
SW
9
2.1
SW
9
1.3
E
16
1.5
E
16
1.6
E
16
1.7
SW
10
Wave Graph
Metric surfscale
Energy kJ
913
968
1033
1202
1238
1480
1433
1162
1081
931
1065
942
798
640
736
891
1177
1273
557
Wind (km/h)
30
WSW
15
W
15
WNW
25
WSW
30
W
25
W
35
W
25
WNW
25
WNW
25
WNW
15
W
15
WNW
10
WSW
25
ESE
10
SE
15
S
15
WSW
10
S
20
E
Wind State
cross
cross-off
cross-off
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross
cross-on
cross-on
cross-on
cross
cross-on
cross
High Tide
11:17PM0.93m
12:03PM0.47m
00:13AM0.94m
1:28AM0.95m
2:47AM0.98m
3:51AM1.03m
6:41PM0.54m
4:42AM1.09m
6:38PM0.56m
Low Tide
7:25AM0.40m
3:28PM0.44m
9:52AM0.36m
11:01AM0.29m
11:37AM0.24m
12:05PM0.19m
9:07PM0.52m
12:31PM0.16m
10:17PM0.46m
thunderstorm
thunderstorm
mod rain
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:35
5:35
5:35
5:37
5:37
5:37
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:24
6:23
6:22
6:22
6:21
6:21
6:20
 mm
6
15
7
17
17
14
16
5
4
17
14
9
5
4
1
12
12
10
17
Temp °C
28
27
27
27
27
27
28
28
28
28
28
29
28
29
29
28
28
28
27
Feels °C
30
30
28
30
29
28
29
28
29
30
30
33
32
30
31
32
31
32
29
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  • 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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