
Surf Forecasts:
Cyrils and Big Left surf forecast from 11 Sep 2026:
- Best quality surf: Saturday 12 Sep, 4AM (local time) - 8ft (2.4m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Tuesday 15 Sep, 7PM (local time) - 13ft (4.0m), 14s period, SW swell with 5,571 kJ wave energy.
- Next surfable swell (1★+): Saturday 12 Sep, 4AM (local time) - 8ft (2.4m), 16s 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 Saturday (Sep 12) at 4AM. The primary swell is predicted to be 2.4m and 16s period with a secondary swell of 0.9m 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 4.0m 14s and forecast to arrive on Tuesday (Sep 15) at 7PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 6s period and expected on Tuesday (Sep 15) at 1AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Sat 12th Sep) | 8ft (2.4m) 16s |
| Best Surf | 4AM (Sat 12th Sep) | 8ft (2.4m) 16s |
| Most Powerful | 7PM (Tue 15th Sep) | 13ft (4.0m) 14s |
Table - best surf conditions forecast for Cyrils and Big Left over the next 16 days.
The Lowdown
Alright, let’s have a look at what’s on offer over the next couple of weeks. It’s a proper mixed bag, but there’s a few windows of really good stuff if you time it right.
We’ve got one spot to focus on here: Cyrils and Big Left (a reef setup). The water’s sitting around 57°, which is pretty much bang on average for the time of year, so no surprises there.
The pattern coming up starts with a building swell, but the first real standout window kicks off on Saturday the 12th of September. Saturday morning we’ve got a solid 7ft SW groundswell, with a very long 16-second period, and a light N offshore breeze. That’s proper clean conditions. The wave energy is strong at (2575). This one is for experienced surfers only, as that size and power will be too much for beginners. Saturday afternoon gets even better – glassy conditions with a SE breeze at just 3 mph, and the swell holding at 7ft from the SW at 15 seconds. That afternoon session is the pick of the whole outlook – glassy, clean, and pumping.
Sunday the 13th is still good, but the wind kicks in strong. Morning has a fresh 22 mph N offshore, with 5ft SW swell at 14 seconds. The offshore wind will keep it clean, but it’s a battle to get out. Wave energy is moderate (1134). Afternoon sees the wind ease a bit, but it’s still fresh from the NNW.
Monday the 14th sees the swell drop to 3ft, with a moderate N offshore in the morning. It’s clean but small. Afternoon turns ugly with a strong cross-shore SW wind.
Things get proper messy from Tuesday the 15th through Wednesday the 16th – strong cross-shore winds and building swell up to 12ft, but the wind and chop make it a write-off for surfing. That’s kite-surfing territory.
We get another nice window on Friday the 18th of September. Both morning and afternoon have a solid 7ft SW swell with a 16-second period, and a fresh NNW/NW offshore wind. Clean and powerful, but again for experienced surfers only. Wave energy is strong (2328 / 2121).
Saturday the 19th of September morning is also a good shout – 6ft SW, moderate NW offshore, clean conditions. A bit smaller, but very surfable.
After that, there’s a gap of poor to marginal conditions until Monday the 21st of September. That morning sees a 7ft SW swell with an 18-second period – very long period groundswell – and a cross-offshore W wind. That’s a big, clean, powerful swell. Wave energy is very strong (3717). This will be best on the reef itself, as long period swells can be tricky on beach breaks. Afternoon has 8ft SW at 16 seconds, light cross-onshore, just small wind ripples.
Tuesday the 22nd of September morning is another standout for the long-range – a big 12ft SW swell at 16 seconds, cross-offshore WNW wind, and wave energy is very strong (6587). This is expert-only, big and powerful, but clean. Afternoon gets messy with strong cross-shore wind.
After that, conditions go downhill again until Thursday the 24th of September morning, which has a clean 5ft SW swell with a NW offshore. A nice little clean-up, but nothing huge.
The final good window is Saturday the 26th of September morning – 5ft SW swell with a very long 15-second period, light NW offshore, clean. Wave energy is moderate (1103). A solid way to wrap up the outlook.
So the absolute best on offer? Saturday 12th afternoon – glassy, 7ft SW, 15 seconds. That’s the one. For the long-range promise, Tuesday 22nd morning is the big, clean, powerful standout, but keep in mind it’s a week and a half out, so not locked in.
Crowds can pop up at Cyrils and Big Left sometimes, so keep that in mind for the good windows.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Sun afternoon, min 11°C on Fri night). Winds increasing (calm on Sat afternoon, fresh winds from the N by Sun morning). | Days 5-7 Weather SummaryLight rain (total 5mm), mostly falling on Mon night. Very mild (max 15°C on Mon night, min 9°C on Wed night). Winds decreasing (strong winds from the SSW on Tue afternoon, calm by Thu afternoon). | ||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | ||||||||||||||
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 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 14 | SW 14 | SW 14 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 |
Wave Graph | |||||||||||||||||||
3077 | 2295 | 1882 | 1381 | 1006 | 927 | 598 | 357 | 290 | 130 | 1723 | 4766 | 4950 | 3777 | 3352 | 2597 | 1804 | 1244 | 1119 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | off | glassy | cross-off | off | off | off | off | cross | cross-off | cross | cross | cross-on | on | cross-on | cross-on | cross-on | cross | off |
High Tide | 11:35PM1.80m | 12:18PM1.90m | 00:41AM1.92m | 1:03PM1.96m | 1:34AM2.03m | 1:42PM2.01m | 2:20AM2.11m | 2:19PM2.03m | 3:01AM2.13m | 2:54PM2.02m | 3:39AM2.11m | 3:27PM1.98m | |||||||
Low Tide | 5:56AM0.48m | 6:30PM0.53m | 6:53AM0.46m | 7:17PM0.36m | 7:41AM0.46m | 7:58PM0.23m | 8:23AM0.48m | 8:37PM0.16m | 9:01AM0.52m | 9:13PM0.14m | 9:37AM0.57m | 9:47PM0.17m | |||||||
— | 6:26 | — | — | 6:24 | — | — | 6:22 | — | — | 6:22 | — | — | 6:20 | — | — | 6:18 | — | — | |
— | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | — | 6:08 | — | — | 6:09 | — | — | 6:10 | — | |
mm | — | — | — | — | — | — | — | — | — | 1 | 2 | 2 | — | — | — | — | — | — | — |
Temp °C | 11 | 17 | 20 | 17 | 20 | 21 | 19 | 15 | 14 | 15 | 11 | 11 | 10 | 11 | 11 | 11 | 9 | 9 | 10 |
Feels °C | 8 | 15 | 17 | 15 | 13 | 15 | 14 | 10 | 9 | 10 | 1 | 0 | -1 | 3 | 4 | 6 | 5 | 6 | 8 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 16 | — | — | SW 14 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 |
3077 | 2295 | 1882 | 1381 | 1006 | 927 | 598 | 357 | 290 | 130 | 357 | — | — | 3777 | 3352 | 2597 | 1804 | 1244 | 1119 | |
Swell 2 Height (m) Direction Period (s) | SSW 15 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 15 | SW 20 | WSW 19 | SW 18 | SSW 14 | — | — | — | — | — | — | SSW 8 | — |
434 | 280 | 144 | 93 | 128 | 45 | 22 | 15 | 37 | 111 | 63 | — | — | — | — | — | — | 72 | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | S 14 | S 18 | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | 4 | 6 | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | N 3 | NNW 4 | N 3 | NNW 3 | WSW 4 | WSW 6 | SW 13 | SW 14 | SW 14 | SW 14 | SW 15 | — | — | — | — |
— | — | — | — | 5 | 10 | 2 | 4 | 7 | 45 | 1723 | 4766 | 4950 | 2577 | 2173 | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 21 | 12 | 0 | 21 | 73 | 62 | 501 | 665 | 266 | 486 | 10 | 10 | 1 | 1 | 0 |
Best forecast wave conditions in Mornington Peninsula | |||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.










