Surf Forecasts:
Cyrils and Big Left surf forecast from 15 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 7AM (local time) - 5ft (1.5m), 15s period, SW swell with cross-offshore winds.
- Most powerful swell: Saturday 22 Aug, 10PM (local time) - 13ft (4.0m), 16s period, SW swell with 8,929 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 7AM (local time) - 5ft (1.5m), 15s 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 Tuesday (Aug 18) at 7AM. The primary swell is predicted to be 1.5m and 15s period with a secondary swell of 0.5m and 5s. 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 4.0m 16s and forecast to arrive on Saturday (Aug 22) at 10PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 5s period and expected on Friday (Aug 21) at 10PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Tue 18th Aug) | 5ft (1.5m) 15s |
| Best Surf | 7AM (Tue 18th Aug) | 5ft (1.5m) 15s |
| Most Powerful | 10PM (Sat 22nd Aug) | 13ft (4.0m) 16s |
Table - best surf conditions forecast for Cyrils and Big Left over the next 16 days.
The Lowdown
G'day, Rusty here. Let’s have a look at what’s on the table for the only spot we’ve got firing in this region: Cyrils and Big Left.
We’re looking at a reef break that’s fairly consistent and exposed to the south, so it picks up a lot of southwest groundswell. Water temp is sitting about average for this time of year at 56°F. The next couple of days are pretty average, with waves in the 5ft to 8ft range but cross-onshore winds messing up the surface. That Saturday 15th has a solid 8ft SW swell with a 15-second period, but the cross-on breeze kills it—marginal at best. Sunday morning the 16th brings a drop to 6ft, still cross-on, not great.
Things start to turn on Tuesday morning the 18th. The swell drops to 4ft, but we get cross-offshore winds from the NE, and it cleans right up. Moderate wave energy (967). This is a nice little window for a cruiser session if you’re after a tidy wave on a reef. Nothing huge, but clean.
We hit a real standout on Friday the 21st. The morning session is the best of the first week: 4ft SW groundswell with a long 16-second period, offshore NW winds at 12 mph, and the energy jumps to 1304 (moderate to strong). Clean, hollow lines on that reef. This is for the experienced crew—the period is long, which can make it a bit walled at a beach break, but at a reef like Cyrils and Big Left, that long-period energy is money. Crowds are possible, so get in early.
Saturday the 22nd goes nuts but in the wrong way. A massive 13ft to 15ft SW swell hits with near gale-force winds. That’s a no-go for paddle surfing—this setup is more interesting for kite surfing if you’re into that. Energy is huge (4279 to 7811). Leave it.
Sunday the 23rd sees the swell still big at 12ft, but the winds swing NW and go cross-offshore, so the reef is sheltering. It’s big, raw, and only for experts—12ft with a 16-second period is a lot of water moving. Energy is 5545. Could be a wild session if you’ve got the nerve.
Monday the 24th and Tuesday the 25th are messy again with onshore winds and big swell (10ft). Not worth it.
Then we get a second standout on Friday the 28th. Morning brings a clean 5ft SW swell with an 18-second period, strong offshore NW winds at 16 mph, and energy of 1418. Saturday the 29th has a smaller 4ft but still clean with cross-offshore winds. And Sunday the 30th is glassy with a 2ft swell but a super long 21-second period—very long lines, but tiny. That Friday 28th is the one to circle for the second week.
Summing it up: The first real draw is Friday morning the 21st of August, clean and punchy on that reef. The second is Friday the 28th, with a bit more size and serious period. Everything else is either blown out, too big, or just small and clean. Make the most of those windows.
Rusty.
Short Range ForecastMostly dry. Very mild (max 15°C on Mon afternoon, min 10°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 5mm), mostly falling on Wed afternoon. Very mild (max 17°C on Tue afternoon, min 11°C on Wed night). Winds decreasing (fresh winds from the N on Wed night, light winds from the SW by Thu night). | |||||||||||||||||||
Sat 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | ||||||||||||||
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 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 14 | SW 15 | SW 14 | SW 15 | SW 15 | SW 18 | SW 17 | WSW 13 | SW 16 | SW 14 | SW 16 |
Wave Graph | ||||||||||||||||||||
2372 | 1736 | 1238 | 1048 | 911 | 885 | 1367 | 1155 | 597 | 621 | 465 | 305 | 232 | 171 | 157 | 186 | 215 | 729 | 846 | 1262 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | on | cross | cross | cross-on | cross | cross-off | cross-on | cross-off | cross-off | cross-off | off | off | cross-off | cross-off | off | off | cross |
High Tide | 1:43AM1.98m | 2:13PM2.13m | 2:37AM2.04m | 2:51PM2.14m | 3:24AM2.06m | 3:27PM2.12m | 4:08AM2.04m | 4:01PM2.07m | 4:48AM1.99m | 4:33PM1.99m | 5:28AM1.90m | 5:04PM1.90m | ||||||||
Low Tide | 7:42PM0.47m | 7:55AM0.29m | 8:28PM0.31m | 8:41AM0.35m | 9:10PM0.21m | 9:24AM0.43m | 9:49PM0.16m | 10:03AM0.53m | 10:25PM0.18m | 10:39AM0.64m | 11:01PM0.23m | 11:15AM0.75m | 11:37PM0.31m | |||||||
— | — | 7:05 | — | — | 7:03 | — | — | 7:03 | — | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — | — | |
5:42 | — | — | 5:43 | — | — | 5:44 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 2 | — | — | — | — | — | 11 |
Temp °C | 13 | 12 | 11 | 12 | 13 | 13 | 15 | 14 | 15 | 17 | 16 | 15 | 15 | 14 | 13 | 14 | 12 | 13 | 16 | 11 |
Feels °C | 9 | 7 | 9 | 9 | 9 | 10 | 11 | 11 | 12 | 13 | 12 | 9 | 9 | 8 | 9 | 11 | 10 | 8 | 10 | 3 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 14 | SW 15 | SW 14 | SW 15 | SW 15 | WSW 14 | SW 14 | WSW 13 | SW 16 | SW 14 | SW 16 |
2372 | 1736 | 1238 | 1048 | 911 | 885 | 1367 | 1155 | 597 | 621 | 465 | 305 | 232 | 171 | 121 | 186 | 215 | 729 | 846 | 1224 | |
Swell 2 Height (m) Direction Period (s) | SSW 15 | SSW 14 | SSW 14 | — | — | SE 4 | SSW 16 | SSW 15 | SW 17 | SSW 16 | SE 4 | SE 7 | SE 7 | SW 20 | SW 18 | SW 17 | SW 16 | WSW 20 | SW 18 | SSW 17 |
376 | 229 | 104 | — | — | 4 | 53 | 79 | 362 | 51 | 4 | 2 | 2 | 60 | 157 | 175 | 201 | 253 | 600 | 27 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | SSW 11 | — | SE 6 | — | SSW 15 | SW 15 | — | ESE 6 | S 17 | E 6 | WNW 3 | WSW 19 | SW 18 | — |
— | — | — | — | — | — | 25 | — | 8 | — | 22 | 9 | — | 4 | 6 | 1 | 4 | 322 | 379 | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | ESE 4 | ESE 4 | SE 4 | ESE 5 | — | ESE 5 | E 4 | N 3 | NNW 4 | NNW 3 | NNW 4 | NNW 4 | WNW 4 | NW 3 | NW 4 | WSW 10 |
— | — | — | — | 6 | 15 | 6 | 21 | — | 11 | 12 | 2 | 10 | 3 | 16 | 15 | 10 | 1 | 10 | 1262 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 10 | 10 | 10 | 10 | 0 | 10 | 10 | 11 | 0 | 10 | 12 | 21 | 23 | 50 | 6 | 0 | 0 | 0 | 34 | 73 |
Best forecast wave conditions in Mornington Peninsula | ||||||||||||||||||||
Best forecast wave conditions in Australia | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.











