Surf Forecasts:
Cyrils and Big Left surf forecast from 30 Aug 2026:
- Best quality surf: Monday 31 Aug, 10PM (local time) - 7ft (2.2m), 17s period, SW swell with cross-offshore winds.
- Most powerful swell: Friday 4 Sep, 4AM (local time) - 10ft (3.0m), 15s period, SW swell with 4,668 kJ wave energy.
- Next surfable swell (1★+): Monday 31 Aug, 7AM (local time) - 6.5ft (2.0m), 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 Monday (Aug 31) at 7AM. The primary swell is predicted to be 2.0m and 14s period with a secondary swell of 0.4m and 21s. 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 3.0m 15s and forecast to arrive on Friday (Sep 04) at 4AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 5s period and expected on Saturday (Sep 05) at 7AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Mon 31st Aug) | 6.5ft (2.0m) 14s |
| Best Surf | 10PM (Mon 31st Aug) | 7ft (2.2m) 17s |
| Most Powerful | 4AM (Fri 4th Sep) | 10ft (3.0m) 15s |
Table - best surf conditions forecast for Cyrils and Big Left over the next 16 days.
The Lowdown
Alright, Rusty here again, giving you the same story in feet and miles per hour.
We’re looking at Cyrils and Big Left for the next couple of weeks. Water temp is about 57°, which is dead average for the season.
The kick-off on Sunday the 30th of August has a 6ft SW swell. Wind is a cross-off at 12 mph, keeping things tidy, but the report calls it marginal. The combined energy is moderate (1217). The afternoon gets a bit cleaner but more side to it, not the best.
Monday the 31st of August is where we get the first standout. Swell bumps to 7ft from the SW, and we score a glassy morning – wind just 3 mph from the SSW. The energy jumps to 1828. That’s clean, lined-up reef for the experienced. The afternoon holds steady at 7ft with glass conditions and even more energy (1982). This is the one.
Tuesday the 1st of September, the wind cranks up to 28 mph offshore from the north. It’s clean, but that wind will kill your paddle. Swell is 6ft with a 16-second period. Only for the fit and experienced.
Wednesday the 2nd has a 7ft SW swell with cross-off winds at 19 mph. It’s clean but textured. Energy is over 2000, but not the best of the run.
Thursday the 3rd of September gets heavy. Swell hits 10ft from the WSW, with energy at 5580 – that’s powerful. Wind is cross-off at 22 mph, so it’s manageable, but this is for experts only.
Friday the 4th of September is the other big standout. Swell is 8-10ft from the SW, with offshore winds from the NNW at 12-19 mph. The morning has a 16-second period and energy of 4519. These are clean, hollow, offshore reef waves. Top shelf.
Saturday the 5th falls apart. The swell is still 10-12ft, but the wind goes near-gale at 31 mph cross-shore in the afternoon. Unsurfable.
Sunday the 6th bounces back. Offshore winds at 12 mph, a 7-8ft SW swell, and energy of 2138. Clean and solid.
Monday the 7th drops to 4ft with low energy, but the wind turns offshore in the afternoon. Small but clean.
Then it’s ugly. Tuesday the 8th of September sees 13ft swell from the WSW with a 17-second period and huge energy (8507), but the wind is a 34 mph cross-onshore near-gale. Don’t go. Wednesday the 9th is similar – 13ft swell but messy.
Things improve Thursday the 10th with a 7ft SW swell and cross-off winds at 16 mph. Surfable and clean.
The best in the second week is Saturday the 12th of September. A 7ft SW swell, light offshore wind from the NW at 6 mph, and energy of 2532. Glassy and clean.
So, if you’re picking one day: Monday the 31st of August for the glassy, mid-range power, and Friday the 4th of September for the big, clean, offshore bomb.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Tue afternoon. Very mild (max 19°C on Tue afternoon, min 9°C on Sun morning). Winds increasing (calm on Mon afternoon, strong winds from the N by Tue morning). | Days 4-6 Weather SummaryModerate rain (total 15mm), heaviest on Fri night. Very mild (max 18°C on Fri afternoon, min 10°C on Thu night). Winds increasing (light winds from the NNW on Thu night, strong winds from the N by Fri night). | ||||||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | |||||||||||||||
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 13 | SW 13 | SW 13 | SW 14 | SW 14 | SW 16 | SW 16 | SW 15 | WSW 14 | SW 15 | SW 15 | SW 14 | WSW 13 | SW 13 | SW 15 | SW 16 | SW 15 | SW 15 | WSW 15 | SW 11 | SW 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1103 | 1210 | 1438 | 1572 | 1572 | 2247 | 1474 | 949 | 1442 | 1885 | 2146 | 2544 | 3347 | 3753 | 4553 | 4193 | 3040 | 2083 | 4394 | 2987 | 2153 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross | cross-off | glassy | off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | off | off | off | cross-off | cross | cross |
High Tide | 1:24PM1.90m | 1:35AM1.82m | 1:55PM1.96m | 2:17AM1.95m | 2:25PM2.00m | 2:57AM2.05m | 2:56PM2.03m | 3:38AM2.11m | 3:28PM2.04m | 4:19AM2.12m | 4:02PM2.04m | 5:03AM2.09m | 4:39PM2.01m | ||||||||
Low Tide | 7:35PM0.60m | 7:42AM0.48m | 8:08PM0.44m | 8:21AM0.47m | 8:40PM0.29m | 8:59AM0.49m | 9:14PM0.17m | 9:36AM0.53m | 9:50PM0.08m | 10:13AM0.60m | 10:30PM0.05m | 10:53AM0.69m | 11:13PM0.07m | ||||||||
 |  |  | | |  | |  |  | |  | |  | | | | |  | | | | |
 | 6:46 | — | — | 6:45 | — | — | 6:43 | — | — | 6:41 | — | — | 6:39 | — | — | 6:39 | — | — | 6:37 | — | — |
 | — | 5:54 | — | — | 5:55 | — | — | 5:57 | — | — | 5:58 | — | — | 5:59 | — | — | 5:59 | — | — | 6:00 | — |
mm | — | — | — | — | — | — | — | 1 | 2 | — | — | — | 1 | — | — | — | — | 14 | 3 | 1 | — |
Temp °C | 10 | 11 | 10 | 10 | 12 | 13 | 17 | 19 | 15 | 13 | 14 | 14 | 14 | 13 | 12 | 15 | 18 | 13 | 12 | 13 | 11 |
Feels °C | 6 | 8 | 6 | 7 | 10 | 10 | 8 | 11 | 8 | 7 | 7 | 6 | 8 | 7 | 6 | 10 | 12 | 4 | 4 | 3 | 3 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 13 | SW 13 | SW 14 | SW 14 | SW 16 | SW 16 | SW 15 | WSW 14 | SW 15 | SW 15 | SW 14 | WSW 13 | — | SW 15 | SW 16 | SW 15 | SW 15 | — | — | SW 11 |
| kJ | 1103 | 1210 | 1438 | 1572 | 1572 | 2247 | 1474 | 949 | 1442 | 1885 | 2146 | 2544 | 3347 | — | 4553 | 4193 | 3040 | 2083 | — | — | 2153 |
Swell 2 Height (m) Direction Period (s) | SW 20 | SW 20 | — | WSW 20 | SW 20 | SSW 16 | SSW 16 | SSW 15 | SW 17 | SSW 16 | SSW 16 | — | — | — | — | SSW 15 | SSW 16 | SSW 16 | — | — | SW 15 |
| kJ | 98 | 136 | — | 256 | 373 | 232 | 94 | 47 | 290 | 98 | 138 | — | — | — | — | 326 | 220 | 95 | — | — | 104 |
Swell 3 Height (m) Direction Period (s) | SW 20 | — | — | — | SSW 20 | — | — | — | WSW 18 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 16 | — | — | — | 37 | — | — | — | 126 | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | NNW 4 | WNW 4 | — | SW 6 | NW 3 | WNW 4 | SW 14 | SW 13 | — | — | — | NNW 4 | WSW 15 | SW 11 | SW 12 |
| kJ | — | — | — | — | — | — | 28 | 32 | — | 116 | 5 | 42 | 2233 | 3753 | — | — | — | 40 | 4394 | 2987 | 1328 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 73 | 1 | 0 | 0 | 0 | 462 | 92 | 59 | 59 | 58 | 90 | 62 | 62 | 8 | 0 | 65 | 333 | 467 | 525 | 1 |
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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