Gunnamatta Beach Surf Break

Lat Long: 38.46° S 144.87° E

Gunnamatta Beach Surf Forecast and Surf Report

Issued: 3 am 27 Aug 2026 (local time)

Forecast update in  hr  min

Today's Gunnamatta Beach sea temperature is
13.8°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 26 Aug 2026:

  • Best quality surf: Monday 31 Aug, 7AM (local time) - 7ft (2.2m), 14s period, SW swell with cross-offshore winds.
  • Most powerful swell: Monday 31 Aug, 10PM (local time) - 7.5ft (2.3m), 17s period, SW swell with 3,005 kJ wave energy.
  • Next surfable swell (1★+): Thursday 27 Aug, 1PM (local time) - 3.5ft (1.1m), 12s 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 Thursday (Aug 27) at 1PM. The primary swell is predicted to be 1.1m and 12s period with a secondary swell of 0.4m and 15s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Gunnamatta Beach in the next 16 days are 2.3m 17s and forecast to arrive on Monday (Aug 31) at 10PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Tuesday (Sep 01) at 4PM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+) 1PM (Thu 27th Aug)3.5ft (1.1m) 12s
Best Surf 7AM (Mon 31st Aug)7ft (2.2m) 14s
Most Powerful10PM (Mon 31st Aug)7.5ft (2.3m) 17s

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


The Lowdown

Alright folks, Rusty here. Let’s have a look at what’s on the cards for our local stretch.

We’ve got some solid pulses of SW swell lining up, but the first few days are a bit of a mixed bag. The real standout is shaping up to be Monday, August 31st, and with a bit of luck, a couple of sessions around that will be the ones to circle.

The window opens on Thursday, August 27th, at Gunnamatta Beach. Early morning sees a clean 4 ft SW swell with a 12-second period, and a light NW cross-off breeze. The water temp is about average for this time of year, so no surprises there. The combined energy is moderate (507). It’s a decent start, but the real juice is still a few days out.

Thursday afternoon holds a similar vibe – 4 ft SW at 14 seconds, still clean with light N winds. It’s a mellow intro to the forecast.

Friday, August 28th, gets a bit more interesting but messy. Morning is a 5 ft SW groundswell (18 seconds – that’s a long period) with a WNW cross-breeze. This long period at a beach break means it might be too straight and fat, and the chop will make it tricky. The afternoon jumps to 7 ft SW onshore – not great for a paddle.

Saturday, August 29th, and Sunday, August 30th, are pretty average. The swell hangs around 5 ft to 6 ft, but the wind is cross-on or onshore, making it lumpy. The energy is moderate, but it’s a struggle for clean lines.

Now, Monday, August 31st – that’s your window. The morning delivers a 7 ft SW swell with a 14-second period, a light NNW cross-off breeze, and clean conditions. The combined energy is strong (2303). This is the kind of session where you’ll find decent power and shape. It’s a bit meaty for beginners, but for the experienced crew, it’s a goer. The afternoon is even better – 8 ft SW, 17-second period (very long period groundswell), light N cross-off, and a massive energy reading of 4382. The waves will have plenty of push, but the long period might make it a bit shifty at the beach. It’s the best of the lot, no question.

Tuesday, September 1st, looks blown out. The swell is still 6 ft SW, but strong NNW winds at 25 mph take the shine off. The energy is still strong, but it’s a battle.

From September 2nd through to the 5th, the wind stays messy, and the swell gets bigger. On the 4th and 5th, we’re looking at 13 ft to 12 ft SW – that’s huge, and the wind is cross or cross-on. The energy values are in the thousands (5107 to 6414), but it’s a washing machine. That’s more kite-surf territory than a fun paddle.

September 6th sees a massive 20 ft WSW swell, with light winds, but the file says it’s too big for this break. The energy is a staggering 28726. That’s for chargers only, and even then, it’s questionable.

The rest of the second week, from the 7th to the 11th, is a mix of big, windy days and occasional clean spells. The 9th looks clean with cross-off winds, but the swell is 12-13 ft – still too big for most. The 10th drops to 8-8 ft but with onshore and cross-on winds, so it’s not a winner.

So, to wrap it up: Thursday and Friday this week are a tease, but the weekend is a write-off. Monday, August 31st, is the standout – the afternoon session especially. After that, it’s a big, messy, and powerful swell that’s either too big or too windy for a proper go. If you’re an experienced surfer, Monday is your day. For the rest, keep an eye on the 10th, but don’t hold your breath.

Rusty.

Short Range Forecast

Mostly dry. Very mild (max 13°C on Thu afternoon, min 9°C on Thu morning). Wind will be generally light.

Days 4-6 Weather Summary

Some drizzle, heaviest during Tue afternoon. Very mild (max 19°C on Tue afternoon, min 10°C on Sun morning). Winds increasing (light winds from the WSW on Sun afternoon, strong winds from the NNW by Tue morning).

Thursday
27
Friday
28
Saturday
29
Sunday
30
Monday
31
Tuesday
1
Wednesday
2
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
3
2
2
2
1
1
1
2
1
2
2
4
4
2
0
0
2
3
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.2
SW
12
1.1
SW
14
1.3
SW
13
1.4
SW
18
2.1
SW
17
1.9
SW
16
1.8
SW
14
1.7
SW
14
2.1
SW
13
1.9
SW
13
2
SW
12
2.2
SW
14
2.2
SW
14
2.1
SW
15
2.3
SW
17
1.8
SW
16
1.7
SW
15
2.1
SW
14
2.5
WSW
14
2
SW
14
2.1
SW
12
Wave Graph
Metric surfscale
Energy kJ
383
404
577
1136
2454
1806
1307
1163
1457
1173
1207
1719
1956
1808
2766
1613
1271
1752
2710
1559
1381
Wind (km/h)
15
NW
10
N
20
WNW
20
WNW
15
SW
20
WSW
15
WNW
20
SW
10
W
15
WNW
10
WSW
15
WNW
15
NNW
10
NNE
25
NNW
45
N
45
NNW
15
W
20
NW
35
WNW
35
NW
Wind State
cross
cross-off
cross
cross
on
on
cross-on
on
cross-on
cross-on
on
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-on
cross
cross-on
cross
High Tide
11:26AM1.34m
10:40PM1.18m
12:14PM1.41m
11:52PM1.26m
12:51PM1.48m
00:48AM1.36m
1:24PM1.54m
1:34AM1.47m
1:54PM1.58m
2:16AM1.58m
2:24PM1.62m
2:56AM1.66m
2:54PM1.64m
3:36AM1.71m
Low Tide
5:29PM0.87m
5:17AM0.49m
6:22PM0.75m
6:13AM0.45m
7:01PM0.62m
7:00AM0.41m
7:34PM0.48m
7:41AM0.39m
8:07PM0.35m
8:20AM0.38m
8:39PM0.23m
8:57AM0.40m
9:12PM0.13m
part cloud
part cloud
part cloud
part cloud
clear
clear
part cloud
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
rain showers
part cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:50
6:50
6:48
6:47
6:45
6:43
6:41
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:52
5:53
5:54
5:55
5:57
5:58
5:58
 mm
1
Temp °C
10
13
12
12
12
11
10
11
11
11
11
11
13
17
15
18
19
14
13
14
13
Feels °C
7
10
10
9
9
7
7
7
7
9
9
8
10
15
12
8
10
8
9
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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