Gunnamatta Beach Surf Break

Lat Long: 38.46° S 144.87° E

Gunnamatta Beach Surf Forecast and Surf Report

Issued: 9 pm 20 Aug 2026 (local time)

Forecast update in  hr  min

Today's Gunnamatta Beach sea temperature is
13.7° C
1.1° 

Gunnamatta Beach surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Gunnamatta Beach surf forecast from 20 Aug 2026:

  • Best quality surf: Saturday 22 Aug, 10PM (local time) - 10ft (3.0m), 14s period, SW swell with cross-onshore winds.
  • Most powerful swell: Saturday 22 Aug, 10AM (local time) - 13ft (4.0m), 15s period, WSW swell with 6,312 kJ wave energy.
  • Next surfable swell (1★+): Saturday 22 Aug, 10PM (local time) - 10ft (3.0m), 14s period with SW swell.

Best Forecast Surf Conditions for Gunnamatta Beach this week:

The surf forecast for Gunnamatta Beach over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Aug 22) at 10PM. The primary swell is predicted to be 3.0m and 14s period with a secondary swell of 0.4m and 21s. The wind is predicted to be cross-onshore as the swell arrives.

The most powerful waves expected at Gunnamatta Beach in the next 16 days are 4.0m 15s and forecast to arrive on Saturday (Aug 22) at 10AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Friday (Aug 28) at 4AM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+)10PM (Sat 22nd Aug)10ft (3.0m) 14s
Best Surf10PM (Sat 22nd Aug)10ft (3.0m) 14s
Most Powerful10AM (Sat 22nd Aug)13ft (4.0m) 15s

Table - best surf conditions forecast for Gunnamatta Beach over the next 16 days.


The Lowdown

Alright, let’s take a look at what’s on offer for Gunnamatta Beach over the next couple of weeks. It’s been a proper mixed bag lately, so buckle up.

We’re kickin’ things off with a bit of a rough patch. Friday the 21st is looking pretty average – cloudy, a fresh cross-breeze, and the swell is around 4 ft to 6 ft but it’s got that lumpy, cross-chop feel. The wave energy is weakish at first (927) and then builds to moderate (1559) but the conditions are just not there. Not worth paddling out for.

Saturday the 22nd is a write-off. The swell jumps up to 13 ft in the morning with a fresh cross-onshore wind, and the energy is massive (over 11,000), but it’s lumpy and messy. By the afternoon, it’s a full-on onshore 25 mph wind from the SW. This is more for the kite crew than paddle surfers.

Sunday the 23rd is where it starts to get interesting. The morning is still a bit rough with a 8 ft SW swell and a moderate cross-shore, but the afternoon is the real standout of the week. The wind drops to a light 3 mph from the north, turning cross-offshore, and the swell holds at 7 ft from the SW with a very long 16-second period. The wave energy is strong (2981). Conditions are clean, and this is prime for experienced surfers. The water temp is about average for this time of year, so no surprises there.

Monday the 24th keeps the clean cross-off wind but the swell drops to 5 ft and the energy dips to moderate (around 945-987). It’s surfable but not special.

Tuesday the 25th morning is a gem. The wind goes glassy – absolutely still from the SSW – and the swell is 6 ft from the SW with a 13-second period. The energy is solid (1263). It’s clean, glassy, and excellent for experienced surfers. The afternoon falls apart though, with a fresh cross-onshore wind ruining it.

From Wednesday the 26th through to Friday the 28th, it’s a rough stretch. The swell is all over the place, from 10 ft down to 4 ft, but the wind is consistently onshore or cross-onshore, and the conditions are choppy, messy, or just poor. There’s a brief window on Saturday the 29th morning with a clean cross-off breeze and a 4 ft SW swell (15-second period, energy 566), but it’s marginal.

Sunday the 30th drops right off – tiny swell around 2 ft to 2 ft, clean but not worth the effort.

The first week of September offers some hope. Monday the 31st of August and Tuesday the 1st of September have clean conditions but very small swell (1 ft to 4 ft), and the energy is moderate (up to 733). The long period (20-21 seconds) on the 31st is interesting but the wave height is just too small.

The real long-range standout is Friday the 4th of September. The morning shows a 8 ft SW swell with a very long 18-second period, and the wind is a moderate cross-off from the NNW, keeping it clean. The wave energy is strong (4858). This is promising for experienced surfers, though it’s a way off so keep an eye on the forecast. The afternoon brings rain showers and a cross-onshore wind, so hit the morning session.

Overall, the best window is Sunday afternoon the 23rd of August, with Tuesday morning the 25th a close second. For the long-range, Friday morning the 4th of September is the one to pencil in.

Rusty.

Short Range Forecast

Light rain (total 4mm), mostly falling on Thu night. Very mild (max 15°C on Sun afternoon, min 9°C on Thu night). Winds decreasing (strong winds from the WNW on Fri night, light winds from the N by Sun afternoon).

Days 5-7 Weather Summary

Light rain (total 7mm), mostly falling on Tue morning. Very mild (max 17°C on Mon afternoon, min 11°C on Sun night). Winds decreasing (fresh winds from the N on Mon morning, calm by Tue morning).

Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
1
0
0
0
3
2
4
3
1
1
1
4
0
0
0
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)
1
SW
16
1.3
WSW
15
1.7
WSW
14
2.1
SW
16
4
WSW
15
3.5
WSW
14
2.5
SW
14
2.3
SW
14
2.2
SW
16
2
SW
16
1.6
SW
14
1.6
SW
14
1.6
SW
13
1.8
SW
13
2.1
SW
13
3
SW
15
3
SW
14
1.9
SW
13
1.5
WSW
13
Wave Graph
Metric surfscale
Energy kJ
502
770
1130
2284
6312
5457
2903
1892
2325
1856
970
930
765
1144
1475
3614
3051
1308
772
Wind (km/h)
30
WNW
30
WNW
30
NW
35
WNW
30
W
40
SW
20
WNW
20
NW
5
N
20
NNW
35
N
25
N
20
NW
5
SSW
30
S
25
SSW
25
SSW
25
SW
20
WSW
Wind State
cross
cross
cross
cross
cross-on
on
cross
cross
cross-off
cross-off
cross-off
cross-off
cross
glassy
cross-on
cross-on
cross-on
on
on
High Tide
5:26AM1.54m
5:01PM1.53m
6:06AM1.46m
5:31PM1.45m
6:51AM1.38m
6:04PM1.37m
7:47AM1.31m
6:44PM1.29m
8:59AM1.27m
7:41PM1.21m
10:20AM1.29m
9:06PM1.17m
Low Tide
10:58PM0.19m
11:12AM0.62m
11:33PM0.25m
11:48AM0.71m
00:11AM0.32m
12:26PM0.81m
00:53AM0.40m
1:16PM0.89m
1:46AM0.46m
2:29PM0.95m
2:53AM0.50m
4:09PM0.95m
rain showers
cloud
cloud
part cloud
clear
clear
clear
clear
clear
part cloud
part cloud
cloud
light rain
light rain
light rain
part cloud
part cloud
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:58
6:58
6:56
6:54
6:54
6:52
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:47
5:49
5:50
5:51
5:52
5:52
 mm
4
2
4
1
Temp °C
11
13
13
12
13
12
12
11
15
13
16
17
14
11
12
12
12
12
12
Feels °C
7
8
6
6
6
4
8
8
12
9
10
11
9
10
6
6
7
6
6
  • 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 Gunnamatta Beach Surf forecast

The above surf forecast table for Gunnamatta Beach provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Gunnamatta Beach can be found by selecting the local surf guide option on the grey menu. Our Gunnamatta Beach 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 (Gunnamatta Beach) 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 Gunnamatta Beach 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.

Gunnamatta Beach is 31 km (19 miles) from Mornington. If you plan a holiday in Mornington Peninsula, look for hotels and other accommodation in Mornington. Mornington has rooms for a wide range of budgets as well as car hire and transport links.

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