Surf Forecasts:
Cyrils and Big Left surf forecast from 21 Aug 2026:
- Best quality surf: Sunday 23 Aug, 1AM (local time) - 10ft (3.0m), 14s period, SW swell with cross-offshore winds.
- Most powerful swell: Saturday 22 Aug, 1PM (local time) - 11ft (3.5m), 14s period, SW swell with 4,375 kJ wave energy.
- Next surfable swell (1★+): Sunday 23 Aug, 1AM (local time) - 10ft (3.0m), 14s period with SW swell.
Best Forecast Surf Conditions for Cyrils and Big Left this week:
The surf forecast for Cyrils and Big Left over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Aug 23) at 1AM. The primary swell is predicted to be 3.0m and 14s period with a secondary swell of 0.5m and 15s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Cyrils and Big Left in the next 16 days are 3.5m 14s and forecast to arrive on Saturday (Aug 22) at 1PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Saturday (Aug 22) at 1AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Sun 23rd Aug) | 10ft (3.0m) 14s |
| Best Surf | 1AM (Sun 23rd Aug) | 10ft (3.0m) 14s |
| Most Powerful | 1PM (Sat 22nd Aug) | 11ft (3.5m) 14s |
Table - best surf conditions forecast for Cyrils and Big Left over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's on the table for the next couple of weeks. The main event is a solid run of swell, but the wind is going to be the real story, keeping things clean for a couple of standout sessions.
The water temperature is sitting at 56.3°F with a 1.6°F anomaly, so it's pretty much right where it should be for this time of year.
First up, we've got a bit of a slow start. The first real action worth mentioning is on Friday, the 21st of August, but it's not great. We're looking at small 4.3ft to 3.9ft swells from the SW with a long 15-second period, combined energy around 1078 (moderate), but those WNW and NW cross-off winds at 16 to 19 mph are going to make it a bit of a wrestling match. It's a marginal call, and the wave energy is moderate, so I'd give it a miss.
The next couple of days aren't much better. Saturday the 22nd shows a bigger 6.9ft to 11.5ft SW swell, but by the afternoon the wind is straight onshore from the SW at 22 mph, creating a lumpy mess. The combined energy spikes to 4334 (strong), but it's poor surf for sure.
Now, here's the real standout. Sunday, the 23rd of August, at Cyrils and Big Left is our pick. We've got a nice 7.5ft to 7.2ft SW groundswell, with a 14-second period, and the combined energy is a solid 2476 (strong) in the morning and 2138 (strong) in the afternoon. But the wind is the hero here. Sunday morning we get a clean offshore from the NW at 9 mph, and by the afternoon it goes glassy with a light 3 mph offshore breeze. This is excellent surf for experienced surfers, with clean, well-shaped waves. The 7.2ft to 7.5ft size is a bit much for beginners, but for the intermediates and up, this is the session to circle. The swell direction is a solid SW, which is a great match for this spot.
Monday the 24th still has some good energy. The swell drops to 4.9ft to 4.6ft from the SW, with a 14-second period. The combined energy is moderate (896 to 758). The offshore winds are back, 19 mph from the NNW in the morning and a lighter 12 mph from the N in the afternoon, keeping conditions clean. It's not the standout of the weekend, but it's a very good option for a fun session.
After that, the forecast gets a bit messy. Tuesday through to the end of the month sees a mix of light rain, onshore winds, and lumpy conditions. There's a bit of a gap here with no real highlights. The swell stays around 4.3ft to 5.6ft but the wind is all over the shop, mostly cross or cross-onshore, and the combined energy is moderate. Nothing to get excited about.
We get a little flicker of hope on Thursday the 27th of August. The swell has dropped back to 3.3ft to 3.6ft, but the period is a long 14-seconds, and the combined energy is a weak 455 to 577. The offshore winds are light from the NNW and N, making for a clean, if small, session. Expect very good conditions for a mellow surf, but it's not a standout.
Friday the 28th of August sees the swell pick up again to 6.6ft to 6.9ft, but with a very long 17 to 18-second period. The combined
Short Range ForecastSome drizzle, heaviest during Sat morning. Very mild (max 15°C on Sun afternoon, min 8°C on Sat night). Winds decreasing (strong winds from the WNW on Fri night, calm by Sun afternoon). | Days 4-6 Weather SummaryModerate rain (total 13mm), heaviest on Mon night. Very mild (max 17°C on Mon afternoon, min 8°C on Wed night). Winds increasing (light winds from the NE on Mon night, strong winds from the WSW by Tue night). | ||||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | |||||||||||||||
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) | WSW 15 | SW 14 | WSW 17 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 16 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 14 | SW 11 | SW 13 | SW 13 | SW 12 | SW 14 | SW 19 |
Wave Graph  | |||||||||||||||||||||
 kJ | 791 | 606 | 2215 | 2021 | 4334 | 3067 | 1892 | 1785 | 1719 | 874 | 743 | 633 | 905 | 976 | 915 | 1685 | 1619 | 689 | 319 | 401 | 1210 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross | cross-off | off | glassy | off | off | off | cross-off | cross-off | cross | cross-off | cross | cross | cross | off | off | off |
High Tide | 5:04PM1.90m | 6:08AM1.81m | 5:36PM1.80m | 6:53AM1.71m | 6:09PM1.70m | 7:47AM1.63m | 6:49PM1.61m | 8:56AM1.58m | 7:45PM1.52m | 10:15AM1.59m | 9:08PM1.46m | 11:22AM1.66m | 10:38PM1.48m | ||||||||
Low Tide | 11:15AM0.75m | 11:37PM0.31m | 11:50AM0.87m | 00:14AM0.40m | 12:29PM0.98m | 00:57AM0.48m | 1:18PM1.08m | 1:49AM0.56m | 2:28PM1.15m | 2:54AM0.61m | 4:02PM1.16m | 4:08AM0.63m | 5:24PM1.07m | ||||||||
 |  |  |  |  | | | |  | | |  |  | |  | | | | | | | |
 | 6:58 | — | — | 6:56 | — | — | 6:56 | — | — | 6:54 | — | — | 6:52 | — | — | 6:52 | — | — | 6:50 | — | — |
 | — | 5:46 | — | — | 5:47 | — | — | 5:49 | — | — | 5:50 | — | — | 5:51 | — | — | 5:52 | — | — | 5:52 | — |
mm | — | — | — | 1 | — | — | — | — | — | — | — | 6 | 2 | 3 | 2 | — | — | — | — | — | — |
Temp °C | 13 | 13 | 12 | 13 | 12 | 12 | 11 | 15 | 13 | 15 | 17 | 15 | 13 | 12 | 12 | 12 | 12 | 11 | 11 | 15 | 13 |
Feels °C | 8 | 7 | 5 | 6 | 4 | 7 | 8 | 12 | 9 | 9 | 13 | 12 | 9 | 5 | 3 | 4 | 4 | 7 | 7 | 11 | 9 |
Swell 1 Height (m) Direction Period (s) | WSW 15 | SW 14 | WSW 17 | SW 15 | — | SW 14 | SW 14 | SW 14 | SW 16 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 14 | SW 11 | SW 13 | SW 13 | SW 12 | SW 14 | SW 19 |
| kJ | 791 | 606 | 2215 | 2021 | — | 3067 | 1892 | 1785 | 1719 | 874 | 743 | 633 | 905 | 976 | 915 | 1685 | 1594 | 689 | 319 | 401 | 1210 |
Swell 2 Height (m) Direction Period (s) | SW 20 | WSW 7 | — | — | — | SSW 15 | SW 18 | SSW 16 | SSW 15 | SSW 15 | SW 20 | SW 18 | ESE 4 | SW 17 | — | SW 20 | SW 18 | SSW 9 | SW 15 | SW 22 | SW 14 |
| kJ | 98 | 85 | — | — | — | 123 | 522 | 353 | 259 | 22 | 15 | 50 | 3 | 281 | — | 15 | 80 | 103 | 106 | 166 | 548 |
Swell 3 Height (m) Direction Period (s) | SW 20 | SW 18 | — | — | — | — | SSW 18 | — | — | — | — | NNW 3 | — | — | — | — | S 18 | SW 16 | S 8 | SSW 7 | SSW 20 |
| kJ | 97 | 460 | — | — | — | — | 62 | — | — | — | — | 1 | — | — | — | — | 6 | 127 | 30 | 10 | 75 |
Wind waves Height (m) Direction Period (s) | W 7 | WSW 7 | WNW 4 | SW 11 | SW 14 | — | — | — | — | N 3 | NNW 3 | NE 3 | NNW 3 | W 3 | WSW 8 | SW 10 | WSW 13 | — | — | — | — |
| kJ | 92 | 135 | 20 | 1403 | 4334 | — | — | — | — | 4 | 4 | 2 | 2 | 6 | 587 | 1156 | 1619 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 8 | 13 | 58 | 62 | 73 | 0 | 0 | 0 | 0 | 34 | 0 | 0 | 0 | 73 | 62 | 62 | 294 | 1 | 0 | 0 | 0 |
Best forecast wave conditions in Mornington Peninsula | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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Information about the Cyrils and Big Left Surf forecast
The above surf forecast table for Cyrils and Big Left provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Cyrils and Big Left can be found by selecting the local surf guide option on the grey menu. Our Cyrils and Big Left 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 (Cyrils and Big Left) 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 Cyrils and Big Left 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.
Cyrils and Big Left is 30 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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