
Surf Forecasts:
Cyrils and Big Left surf forecast from 6 Aug 2026:
- Best quality surf: Thursday 13 Aug, 4AM (local time) - 25ft (7.5m), 17s period, SW swell with cross-shore winds.
- Most powerful swell: Thursday 13 Aug, 7AM (local time) - 23ft (7.0m), 18s period, SW swell with 31,727 kJ wave energy.
- Next surfable swell (1★+): Friday 7 Aug, 10AM (local time) - 5ft (1.6m), 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 Friday (Aug 07) at 10AM. The primary swell is predicted to be 1.6m and 15s period with a secondary swell of 0.8m and 7s. 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 7.0m 18s and forecast to arrive on Thursday (Aug 13) at 7AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Tuesday (Aug 11) at 4AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10AM (Fri 7th Aug) | 5ft (1.6m) 15s |
| Best Surf | 4AM (Thu 13th Aug) | 25ft (7.5m) 17s |
| Most Powerful | 7AM (Thu 13th Aug) | 23ft (7.0m) 18s |
Table - best surf conditions forecast for Cyrils and Big Left over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get into it.
We’ve got one spot on the radar for the next 16 days: Cyrils and Big Left. This is a reef set-up, so it handles a decent swell, and it loves a solid S direction. The water temp is sitting at 56°, which is about 1° warmer than usual for this time of year – nothing crazy, just a touch on the mild side.
The first real standout window is Friday, August 7th. Thursday the 6th is a bit of a warm-up, but Friday morning you’re looking at a clean 5ft of SW swell with a 15-second period – that’s proper groundswell energy. The wind is a light cross-off, and the combined energy is sitting at 1336, which is a solid moderate push. The afternoon is even better: the wind drops to glassy, and the swell holds at 5ft with the same long period, energy jumping to 1648. This is the pick of the early days. The swell is a bit much for beginners, but for intermediates and up, this is prime.
Saturday the 8th still has size at 5ft, but the wind swings N and kicks up to 35 km/h, turning it cross-off and making it feel a bit messy. The afternoon is offshore but the wind is strong, so it’s clean but a bit of a battle. Sunday the 9th is a write-off with rain and strong winds – just skip it.
Now, Monday the 10th gets interesting. The swell jumps to 18ft in the morning, then 10ft in the afternoon, with a massive energy reading of 6444 and 9261. That’s serious power, but it’s also too big for most. The wind is cross-off, so it’s clean, but this is strictly for experts only. The period on the afternoon is 17 seconds – very long, so it’ll be a freight train on the reef. Not for the faint-hearted.
Tuesday the 11th drops to 6ft but the wind is a strong 45 km/h offshore, making it clean but incredibly hard to paddle into. The energy is still high at 1308, but you’ll be fighting the wind. Wednesday the 12th builds up again with a 6ft swell and a 19-second period, energy 3216, but the afternoon goes to hell with a 55 km/h WSW cross-shore and near gale conditions. Thursday the 13th sees a massive 20ft SW swell, energy hitting 23627 – that’s a huge, powerful groundswell, but it’s predicted to be too big for the break. The afternoon is a bit more manageable at 15ft, but still expert territory.
After that, the swell drops back to 8ft to 10ft through the second week, but the wind is inconsistent. Friday the 14th has a clean cross-off in the morning, but the afternoon gets messy with a cross-chop. Saturday the 15th is blown out by a cross-onshore. Sunday the 16th through Tuesday the 19th sees a return to cleaner conditions, with Monday the 17th offering a nice 4ft SW swell and moderate offshore wind – good for a relaxed session if you missed the big stuff. Wednesday the 19th morning is the late highlight: 6ft of SW swell, 16-second period, clean offshore wind, and energy at 1538. That’s a proper, well-shaped wave for experienced surfers.
The last few days, from the 20th onwards, are a mixed bag. The 20th holds clean 6ft swell with a 21-second period – that’s very long, so expect big lulls and then a set that stands up fast. The 21st is a complete write-off with strong cross-onshore winds and rain.
So, if you’re picking your window, Friday the 7th is the cleanest, most user-friendly standout for a solid intermediate session. For the big-wave crew, Monday the 10th and Thursday the 13th are the real heavy hitters, but only if you know what you’re doing.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Sat night. Very mild (max 15°C on Sat afternoon, min 10°C on Thu morning). Winds increasing (calm on Fri afternoon, strong winds from the N by Sat night). | Days 4-6 Weather SummaryHeavy rain (total 22mm), heaviest during Sun night. Very mild (max 14°C on Tue afternoon, min 10°C on Mon night). Winds decreasing (near gales from the WSW on Sun night, moderate winds from the NW by Mon night). | ||||||||||||||||||||
Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | |||||||||||||||
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 12 | SW 16 | SW 18 | SW 15 | SW 15 | SW 17 | SW 16 | SW 16 | SW 14 | SW 14 | SW 13 | SW 16 | SW 11 | SW 17 | WSW 16 | SW 14 | SW 14 | SW 13 | SW 19 | WSW 18 | WSW 16 |
Wave Graph | |||||||||||||||||||||
287 | 242 | 522 | 1219 | 1171 | 1757 | 1210 | 1074 | 857 | 548 | 342 | 952 | 6444 | 5176 | 2986 | 1289 | 1034 | 543 | 2074 | 7125 | 13404 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross-off | cross-off | glassy | cross-off | cross-off | off | off | cross-off | cross-off | cross | cross-off | cross-off | off | off | off | off | off | cross | cross |
High Tide | 4:28PM2.02m | 5:22AM1.97m | 5:02PM1.99m | 6:11AM1.96m | 5:41PM1.95m | 7:08AM1.91m | 6:27PM1.90m | 8:14AM1.86m | 7:25PM1.83m | 9:29AM1.84m | 8:38PM1.76m | 10:44AM1.87m | 10:04PM1.74m | ||||||||
Low Tide | 10:30AM0.60m | 10:55PM0.19m | 11:11AM0.69m | 11:36PM0.14m | 11:56AM0.80m | 00:23AM0.12m | 12:47PM0.91m | 1:19AM0.15m | 1:50PM1.01m | 2:24AM0.19m | 3:09PM1.05m | 3:38AM0.23m | 4:34PM0.99m | ||||||||
7:16 | — | — | 7:16 | — | — | 7:15 | — | — | 7:13 | — | — | 7:11 | — | — | 7:11 | — | — | 7:09 | — | — | |
— | 5:34 | — | — | 5:35 | — | — | 5:36 | — | — | 5:37 | — | — | 5:37 | — | — | 5:38 | — | — | 5:39 | — | |
mm | — | — | — | — | — | — | — | — | 3 | 1 | 2 | 18 | 1 | — | — | — | — | — | — | 3 | 3 |
Temp °C | 12 | 14 | 12 | 11 | 14 | 14 | 14 | 15 | 14 | 12 | 12 | 11 | 12 | 11 | 11 | 13 | 14 | 14 | 12 | 10 | 11 |
Feels °C | 7 | 9 | 7 | 8 | 12 | 10 | 6 | 8 | 7 | 3 | 5 | 4 | 2 | 3 | 4 | 5 | 6 | 6 | 4 | -2 | 0 |
Swell 1 Height (m) Direction Period (s) | SW 12 | WSW 12 | SW 18 | SW 15 | SW 15 | SW 17 | SW 16 | SW 16 | SW 14 | SW 14 | SW 13 | SW 16 | — | SW 10 | SW 16 | SW 14 | SW 14 | SW 13 | WSW 13 | SSW 18 | — |
287 | 174 | 522 | 1219 | 1171 | 1757 | 1210 | 1074 | 857 | 548 | 342 | 952 | — | 1591 | 2868 | 1289 | 1034 | 543 | 932 | 182 | — | |
Swell 2 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 14 | SW 7 | SW 19 | SW 18 | SSW 16 | SSW 16 | SSW 14 | SW 18 | SW 18 | SW 20 | — | SW 17 | SSW 16 | SSW 8 | SSW 8 | SW 22 | SW 19 | — | — |
206 | 242 | 211 | 67 | 441 | 437 | 50 | 48 | 41 | 83 | 154 | 694 | — | 2494 | 84 | 19 | 13 | 379 | 2074 | — | — | |
Swell 3 Height (m) Direction Period (s) | SW 16 | WSW 20 | S 15 | SSW 16 | SW 7 | SW 6 | — | — | — | SSW 14 | SW 25 | SSW 21 | — | — | — | — | SSW 14 | S 22 | SSW 19 | — | — |
93 | 38 | 17 | 50 | 36 | 14 | — | — | — | 18 | 24 | 86 | — | — | — | — | 40 | 9 | 210 | — | — | |
Wind waves Height (m) Direction Period (s) | NW 3 | W 4 | SW 6 | — | — | N 3 | N 4 | N 4 | N 3 | N 4 | N 4 | N 3 | SW 11 | SW 17 | WSW 16 | NNW 4 | NNW 4 | NNW 4 | WNW 4 | WSW 18 | WSW 16 |
2 | 9 | 120 | — | — | 4 | 13 | 9 | 8 | 27 | 48 | 8 | 6444 | 5176 | 2986 | 11 | 15 | 49 | 42 | 7125 | 13404 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 8 | 50 | 0 | 0 | 0 | 38 | 21 | 34 | 59 | 52 | 136 | 62 | 50 | 50 | 50 | 65 | 92 | 90 | 462 | 62 |
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.











