Surf Forecasts:
Cyrils and Big Left surf forecast from 9 Aug 2026:
- Best quality surf: Monday 10 Aug, 1AM (local time) - 4ft (1.2m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Wednesday 12 Aug, 10PM (local time) - 10ft (3.0m), 17s period, WSW swell with 4,358 kJ wave energy.
- Next surfable swell (1★+): Monday 10 Aug, 1AM (local time) - 4ft (1.2m), 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 Monday (Aug 10) at 1AM. The primary swell is predicted to be 1.2m and 16s period with a secondary swell of 0.9m and 20s. 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 17s and forecast to arrive on Wednesday (Aug 12) at 10PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 4s period and expected on Wednesday (Aug 12) at 4AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Mon 10th Aug) | 4ft (1.2m) 16s |
| Best Surf | 1AM (Mon 10th Aug) | 4ft (1.2m) 16s |
| Most Powerful | 10PM (Wed 12th Aug) | 10ft (3.0m) 17s |
Table - best surf conditions forecast for Cyrils and Big Left over the next 16 days.
The Lowdown
Alright, Rusty here, checking the charts for the next couple of weeks. Only one spot in the mix, so let’s talk it through.
We’re looking at Cyrils and Big Left. It’s a reef break, pretty consistent. Water temp is 56°F, which is right where it should be for this time of year.
The first few days are a bust. Sunday the 9th is a washout with light rain and a cross-off breeze, only pushing 1.0 to 1ft of swell. Not worth the wet suit.
Monday the 10th is where it gets real. A solid SW groundswell hits at 2ft, with a very long period of 19 seconds. The wind goes offshore out of the NNW, which is perfect. The energy is strong (2759). That long period on a reef means heavy, powerful lines. Monday morning is the top pick of the first week. The afternoon turns to garbage with a strong cross-shore, so get in early.
Tuesday the 11th is a mixed bag. Morning is clean but smaller at 1ft. The afternoon improves to 2ft with offshore wind, making it a clean session. Solid option.
Thursday the 13th is the next big one. Swell jumps to 3ft from the SW, period of 15 seconds. The wind is a gentle cross-off in the afternoon, and it’s clean. The energy is strong (2857). This is excellent for experienced surfers. Thursday afternoon is a winner. The morning is also good, but a bit windier.
Friday the 14th morning is still solid with 3ft and clean conditions, but the afternoon turns onshore and choppy.
From the 15th through the 17th, it’s a lull. Swell drops, wind goes onshore, and it’s choppy. Sit it out.
Monday the 17th morning is a nice rebound. Clean with a light offshore breeze and a 1ft SW swell. Small but fun.
Tuesday the 18th morning is another gem. 1ft of SW swell, but the wind is offshore and light, the energy is moderate (1020), and it’s clean. Great for a log or a fish.
The 19th is also good, with clean conditions and a 1 to 1ft swell. The afternoon has a light offshore, making it very clean.
Skip the 20th. The wind is screaming offshore at 40 km/h (25 mph), and while it’s clean, you’ll be stuck fighting the wind for the 0.9ft waves. Not happening.
The 21st and 22nd are small and a bit onshore, but the 22nd morning is glassy. That’s a rare treat. A 1ft swell with glassy conditions means a quiet, clean session.
The absolute standout, the one you block out for, is Sunday the 23rd. The morning is glassy – dead flat water – with a 2ft SW groundswell, period of 17 seconds, and huge energy (2809). This is the best wave of the forecast. On a reef, that long period will be magic. If you’re experienced, this is the session. The afternoon is still good but gets a slight cross-on breeze.
Monday the 24th is still solid, with 2ft of SW swell, but the wind is cross-shore, so it’s not as clean as the 23rd.
Bottom line: the morning of the 23rd is the top pick, with the afternoon of the 13th a close second. Don’t sleep on the 10th morning either.
Rusty.
Short Range ForecastHeavy rain (total 30mm), heaviest during Sun night. Very mild (max 13°C on Sun afternoon, min 8°C on Sun night). Winds increasing (light winds from the NNE on Sun night, strong winds from the SW by Mon afternoon). | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Wed morning. Very mild (max 13°C on Thu afternoon, min 10°C on Wed morning). Winds decreasing (strong winds from the WSW on Wed morning, light winds from the SW by Fri night). | ||||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | |||||||||||||||
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 13 | SW 16 | SW 19 | SW 17 | SW 16 | SW 14 | SW 14 | SW 17 | SW 16 | SW 16 | WSW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 548 | 347 | 711 | 2612 | 2375 | 3745 | 821 | 1147 | 1350 | 2694 | 2645 | 4036 | 3204 | 2717 | 2754 | 2906 | 2906 | 2525 | 2178 | 1863 | 1580 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | off | cross | cross-off | cross-off | off | off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | cross | on | on | cross-on |
High Tide | 6:27PM1.90m | 8:14AM1.86m | 7:25PM1.83m | 9:29AM1.84m | 8:38PM1.76m | 10:44AM1.87m | 10:04PM1.74m | 11:50AM1.94m | 11:29PM1.79m | 12:45PM2.02m | 00:42AM1.88m | 1:31PM2.09m | 1:43AM1.98m | ||||||||
Low Tide | 12:47PM0.91m | 1:19AM0.15m | 1:50PM1.01m | 2:24AM0.19m | 3:09PM1.05m | 3:38AM0.23m | 4:34PM0.99m | 4:54AM0.25m | 5:49PM0.85m | 6:02AM0.25m | 6:51PM0.66m | 7:02AM0.26m | 7:42PM0.47m | ||||||||
 | |  | |  |  |  | |  | |  | | | | | | |  | |  |  | |
 | 7:13 | — | — | 7:11 | — | — | 7:11 | — | — | 7:09 | — | — | 7:09 | — | — | 7:07 | — | — | 7:05 | — | — |
 | — | 5:37 | — | — | 5:37 | — | — | 5:38 | — | — | 5:39 | — | — | 5:39 | — | — | 5:40 | — | — | 5:42 | — |
mm | 5 | 4 | 17 | 2 | 1 | 1 | — | — | — | 1 | — | 1 | — | 1 | — | 1 | — | — | 1 | — | — |
Temp °C | 11 | 13 | 13 | 9 | 13 | 13 | 11 | 12 | 11 | 11 | 12 | 12 | 12 | 13 | 13 | 13 | 12 | 12 | 12 | 11 | 11 |
Feels °C | 4 | 5 | 7 | 2 | 4 | 6 | 4 | 5 | 1 | 3 | 6 | 5 | 7 | 10 | 8 | 8 | 6 | 8 | 9 | 7 | 8 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 13 | SW 16 | SW 19 | NW 4 | SSW 16 | SW 14 | SW 14 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 |
| kJ | 548 | 347 | 711 | 2612 | 6 | 83 | 821 | 1147 | 1350 | 2694 | 2645 | 3417 | 3204 | 2717 | 2754 | 2906 | 2906 | 2525 | 2178 | 1863 | 1580 |
Swell 2 Height (m) Direction Period (s) | SW 18 | SW 18 | SW 20 | SSW 19 | ESE 10 | — | WSW 8 | SW 7 | — | SSW 16 | — | — | SSW 15 | SSW 16 | — | — | SSW 16 | SSW 16 | SSW 14 | — | SSW 15 |
| kJ | 83 | 154 | 598 | 143 | 32 | — | 232 | 75 | — | 140 | — | — | 135 | 140 | — | — | 196 | 191 | 156 | — | 71 |
Swell 3 Height (m) Direction Period (s) | SSW 14 | — | ESE 6 | ESE 4 | — | — | S 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 18 | — | 12 | 4 | — | — | 39 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNE 3 | NE 3 | NE 3 | NNW 3 | SW 17 | SW 16 | NW 4 | NW 4 | NNW 4 | WNW 4 | WSW 7 | WSW 16 | — | — | — | — | — | — | — | — | — |
| kJ | 6 | 4 | 2 | 5 | 2375 | 3745 | 7 | 11 | 42 | 30 | 266 | 4036 | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 25 | 29 | 0 | 50 | 319 | 59 | 58 | 50 | 269 | 62 | 1 | 59 | 1 | 0 | 8 | 8 | 90 | 13 | 10 | 10 | 10 |
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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