Surf Forecasts:
Cyrils and Big Left surf forecast from 24 Aug 2026:
- Best quality surf: Monday 31 Aug, 10AM (local time) - 7.5ft (2.3m), 19s period, SW swell with offshore winds.
- Most powerful swell: Monday 31 Aug, 1PM (local time) - 7.5ft (2.3m), 19s period, SW swell with 3,817 kJ wave energy.
- Next surfable swell (1★+): Monday 24 Aug, 4PM (local time) - 4.5ft (1.4m), 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 Monday (Aug 24) at 4PM. The primary swell is predicted to be 1.4m and 14s period with a secondary swell of 0.1m and 20s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Cyrils and Big Left in the next 16 days are 2.3m 19s and forecast to arrive on Monday (Aug 31) at 1PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Friday (Aug 28) at 4AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4PM (Mon 24th Aug) | 4.5ft (1.4m) 14s |
| Best Surf | 10AM (Mon 31st Aug) | 7.5ft (2.3m) 19s |
| Most Powerful | 1PM (Mon 31st Aug) | 7.5ft (2.3m) 19s |
Table - best surf conditions forecast for Cyrils and Big Left over the next 16 days.
The Lowdown
Alright, listen up, folks. Rusty here. We’ve only got one spot on the radar for the next sixteen days, and that’s Cyrils and Big Left. It’s a reef setup, so you’re looking at a proper wave, not some mushy beach slop. The water’s sitting at 56°, which is pretty much standard for this time of year, nothing wild.
The week starts slow. Monday the 24th has some clean options with a 5 ft SW swell, but the energy is moderate (874). The morning’s a bit fresh with a 19 mph offshore, but it’s clean. The afternoon glass is off, with a gentle offshore and 5 ft, feeling pretty good. Tuesday the 25th gets a bit bigger, 6 ft, but the wind swings cross-off in the morning and then goes cross in the afternoon, so it’s a bit of a lottery. Wednesday the 26th is a write-off with a cross-onshore breeze and chop, just not worth it.
Now, Thursday the 27th is where it gets interesting. The morning is clean with a light offshore, 4 ft, but the afternoon is glassy, wind is dead calm, and it’s a clean 4 ft. It’s not the biggest, but it’ll be a real treat for a nice, cruisy session. Then Friday the 28th brings a proper groundswell, period hitting 18 seconds, with a 5 ft swell. The morning is clean with a moderate offshore. That’s a standout morning for anyone who knows how to read a reef. The energy is strong (1864).
Saturday the 29th and Sunday the 30th are cleaner, smaller leftovers, but still rideable. The real highlight, though, is Monday the 31st. That’s the one. The morning has a 8 ft swell from the SW, period 19 seconds, which is a very long period groundswell. The energy is huge (4035). The wind is a light offshore. It’s going to be big, powerful, and for experienced surfers only. The afternoon is glassy, with the same 8 ft and a 18-second period. That is the best on offer in the whole run, but it’s a week out, so keep an eye on it.
The first week of September is a mixed bag. Tuesday the 1st and Wednesday the 2nd are okay but not special. Thursday the 3rd has a big jump to 10 ft in the afternoon, but the wind is howling at 31 mph in the morning, so you’ll need to be hardy. The real monster is Sunday the 6th and Monday the 7th. Sunday afternoon sees a 10 ft swell with a 13-second period and a massive energy of 5819, but the wind is a strong 28 mph offshore, making it hard to paddle into. Monday the 7th is a write-off with gale-force winds and an 18 ft swell that’s just a washing machine. The very end of the run, on Tuesday the 8th, has a 15 ft swell and a 18-second period, with an energy of 18329, but the wind is 28 mph and it’s flagged as too big for this break. The setup looks more interesting for kite surfing than paddle surfing at that point.
So, to wrap it up: your best bets are the glassy Thursday afternoon the 27th for a clean, fun session, and the big Monday the 31st for the experienced crew looking for a proper challenge. Keep your eyes on the long-range stuff, but it’s a bit of a wildcard.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Mon night. Very mild (max 16°C on Mon afternoon, min 9°C on Wed night). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Very mild (max 15°C on Fri afternoon, min 9°C on Thu morning). Wind will be generally light. | ||||||||||||||||||||
Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | |||||||||||||||
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) | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 14 | SW 14 | SW 13 | SW 13 | SW 12 | SW 12 | SW 20 | SW 18 | SW 17 | SW 16 | SW 14 | SW 14 | SW 13 | SW 13 | SW 16 | SW 14 |
Wave Graph | |||||||||||||||||||||
874 | 722 | 643 | 969 | 710 | 1094 | 1344 | 905 | 732 | 389 | 324 | 552 | 1278 | 2368 | 1449 | 928 | 752 | 444 | 424 | 427 | 1171 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | cross-off | cross-off | cross | cross | cross-on | cross-on | cross | off | glassy | off | off | cross | glassy | cross-off | cross-on | glassy | cross-off | cross-on | glassy |
High Tide | 6:49PM1.61m | 8:56AM1.58m | 7:45PM1.52m | 10:15AM1.59m | 9:08PM1.46m | 11:22AM1.66m | 10:38PM1.48m | 12:12PM1.74m | 11:51PM1.56m | 12:50PM1.83m | 00:48AM1.69m | 1:24PM1.90m | 1:35AM1.82m | ||||||||
Low Tide | 1:18PM1.08m | 1:49AM0.56m | 2:28PM1.15m | 2:54AM0.61m | 4:02PM1.16m | 4:08AM0.63m | 5:24PM1.07m | 5:16AM0.60m | 6:19PM0.93m | 6:12AM0.55m | 7:00PM0.77m | 7:00AM0.51m | 7:35PM0.60m | ||||||||
6:54 | — | — | 6:52 | — | — | 6:52 | — | — | 6:50 | — | — | 6:48 | — | — | 6:48 | — | — | 6:46 | — | — | |
— | 5:50 | — | — | 5:51 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:54 | — | |
mm | — | — | 3 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 16 | 15 | 13 | 13 | 13 | 13 | 12 | 12 | 11 | 14 | 14 | 14 | 15 | 13 | 12 | 13 | 13 | 12 | 14 | 13 |
Feels °C | 8 | 12 | 11 | 11 | 10 | 9 | 8 | 7 | 9 | 8 | 11 | 10 | 10 | 12 | 12 | 11 | 12 | 12 | 11 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 14 | SW 14 | SW 13 | SW 13 | SW 12 | SW 12 | SW 13 | SW 18 | SW 17 | SW 16 | SW 14 | SW 14 | SW 13 | SW 13 | SW 12 | SW 14 |
874 | 722 | 643 | 969 | 710 | 1094 | 1344 | 905 | 732 | 389 | 324 | 431 | 1278 | 2368 | 1449 | 928 | 752 | 444 | 424 | 423 | 1171 | |
Swell 2 Height (m) Direction Period (s) | — | SW 20 | SW 18 | SW 18 | SW 16 | — | S 15 | SW 18 | SW 16 | SW 15 | SW 22 | SW 20 | WSW 13 | SSW 17 | S 16 | S 15 | SW 24 | WSW 22 | SW 18 | SW 16 | SW 23 |
— | 15 | 50 | 51 | 381 | — | 4 | 12 | 91 | 76 | 118 | 552 | 555 | 96 | 45 | 17 | 22 | 45 | 212 | 427 | 187 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | SW 22 | SW 22 | SSW 9 | SSW 18 | — | — | — | — | S 13 | SSW 14 | SW 20 | SSW 18 |
— | — | — | — | — | — | — | — | — | 20 | 73 | 8 | 31 | — | — | — | — | 4 | 40 | 61 | 32 | |
Wind waves Height (m) Direction Period (s) | NNW 3 | NNW 4 | NE 3 | E 4 | — | SW 4 | SW 14 | SW 13 | — | — | — | — | — | — | — | — | — | — | — | — | — |
6 | 4 | 2 | 7 | — | 12 | 886 | 694 | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 12 | 0 | 12 | 6 | 1 | 73 | 10 | 10 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 1 | 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.











