Surf Forecasts:
Cyrils and Big Left surf forecast from 18 Aug 2026:
- Best quality surf: Saturday 22 Aug, 4PM (local time) - 8ft (2.5m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Saturday 22 Aug, 4PM (local time) - 8ft (2.5m), 16s period, SW swell with 2,982 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 1AM (local time) - 2.5ft (0.7m), 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 Thursday (Aug 20) at 1AM. The primary swell is predicted to be 0.7m and 15s period with a secondary swell of 0.2m and 20s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Cyrils and Big Left in the next 16 days are 2.5m 16s and forecast to arrive on Saturday (Aug 22) at 4PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 4s period and expected on Wednesday (Aug 19) at 1PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Thu 20th Aug) | 2.5ft (0.7m) 15s |
| Best Surf | 4PM (Sat 22nd Aug) | 8ft (2.5m) 16s |
| Most Powerful | 4PM (Sat 22nd Aug) | 8ft (2.5m) 16s |
Table - best surf conditions forecast for Cyrils and Big Left over the next 16 days.
The Lowdown
Alright, let’s talk surf. Only one spot in the mix for the next 16 days, so we’re gonna focus on Cyrils and Big Left – a reef that loves a south swell. Water temp is about 13°F? No, that’s metric – we’re in imperial now. Water temp is around 56°F, which is dead average for this time of year.
The first real action is Tuesday 18th August. Morning: 4ft from the SW, 14 second period (groundswell), with a NE cross-off breeze. Combined energy is 962 (moderate, but solid). Clean, fun waves. Not huge, but the conditions are dialed.
Wednesday 19th is a write-off – strong north winds (25 mph), tiny swell, messy.
Thursday 20th morning: 2ft, very long period (18 seconds), NW offshore wind. Clean but tiny – longboard territory.
The standout is Saturday 22nd August. Morning: 8ft from the SW, 16 second period, NW offshore wind – energy 3084 (strong). That’s expert-only. The afternoon: still 8ft, 16s, but wind drops to a light W cross-off, energy 3126. This is the best of the whole run. Clean, powerful, big.
Sunday 23rd afternoon: 7ft, 14s, glassy conditions (NNW 3 mph). Energy 1599. Still big, but glassy makes it magic.
Second week: Monday 24th has 5ft, fresh offshore NW wind, energy 1014 – clean but not as punchy. Friday 28th morning: 8ft WSW, 14s, WNW cross-off, energy 2224 (strong). Clean, but cross-off wind.
The rest is smaller, wind-affected, or just average. The last few days (31st to 2nd September) have 3-4ft, mostly offshore winds, but low energy.
Bottom line: Saturday 22nd August afternoon is the day. Big, clean, powerful – experts only. Friday 21st afternoon and Sunday 23rd afternoon are solid backups. The rest is a gamble.
Rusty.
Short Range ForecastLight rain (total 9mm), mostly falling on Thu night. Very mild (max 18°C on Tue afternoon, min 11°C on Thu night). Winds increasing (light winds from the ENE on Tue afternoon, strong winds from the N by Wed afternoon). | Days 4-6 Weather SummaryMostly dry. Very mild (max 15°C on Sun afternoon, min 9°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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 14 | SW 15 | SW 14 | SW 15 | SW 15 | SW 18 | WSW 13 | WSW 13 | WSW 15 | WSW 14 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 16 | SW 14 | SW 14 | SW 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 597 | 621 | 465 | 251 | 239 | 217 | 157 | 303 | 219 | 791 | 947 | 2438 | 2944 | 2982 | 2614 | 1657 | 1541 | 1622 | 978 | 872 | 1010 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-off | cross-off | off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off | glassy | off | off | off | off |
High Tide | 3:27PM2.12m | 4:08AM2.04m | 4:01PM2.07m | 4:48AM1.99m | 4:33PM1.99m | 5:28AM1.90m | 5:04PM1.90m | 6:08AM1.81m | 5:36PM1.80m | 6:53AM1.71m | 6:09PM1.70m | 7:47AM1.63m | 6:49PM1.61m | ||||||||
Low Tide | 9:49PM0.16m | 10:03AM0.53m | 10:25PM0.18m | 10:39AM0.64m | 11:01PM0.23m | 11:15AM0.75m | 11:37PM0.31m | 11:50AM0.87m | 00:14AM0.40m | 12:29PM0.98m | 00:57AM0.48m | 1:18PM1.08m | 1:49AM0.56m | ||||||||
 | |  |  |  | |  | |  | | | | | | |  | | | | | | |
 | 7:03 | — | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — | — | 6:56 | — | — | 6:56 | — | — | 6:54 | — | — |
 | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — | 5:47 | — | — | 5:49 | — | — | 5:50 | — |
mm | — | — | — | 3 | 2 | — | — | — | 4 | — | — | — | — | — | — | — | — | — | — | 3 | 2 |
Temp °C | 15 | 18 | 17 | 14 | 14 | 13 | 13 | 14 | 12 | 12 | 13 | 13 | 12 | 13 | 13 | 12 | 15 | 14 | 16 | 16 | 14 |
Feels °C | 11 | 15 | 13 | 6 | 6 | 7 | 8 | 10 | 7 | 8 | 8 | 8 | 7 | 11 | 9 | 8 | 13 | 12 | 10 | 11 | 8 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 14 | SW 15 | SW 14 | SW 15 | SW 15 | WSW 9 | WSW 13 | WSW 13 | WSW 15 | WSW 14 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 16 | SW 14 | SW 14 | SW 12 |
| kJ | 597 | 621 | 465 | 251 | 239 | 217 | 80 | 303 | 219 | 791 | 947 | 2438 | 2944 | 2982 | 2614 | 1657 | 1541 | 1622 | 978 | 872 | 1010 |
Swell 2 Height (m) Direction Period (s) | SW 17 | SSW 16 | WSW 16 | ESE 6 | SE 7 | WSW 20 | SW 14 | SW 17 | SW 16 | SW 20 | SW 18 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SW 17 | SSW 17 | SSW 16 | SW 22 | WSW 21 | SW 19 |
| kJ | 358 | 51 | 212 | 4 | 2 | 40 | 147 | 222 | 216 | 98 | 379 | 87 | 140 | 144 | 212 | 671 | 58 | 48 | 18 | 43 | 93 |
Swell 3 Height (m) Direction Period (s) | SE 5 | — | SSW 16 | SW 15 | — | SW 20 | SW 18 | SW 18 | WSW 7 | — | — | — | — | — | SSW 20 | SSW 18 | — | — | SW 22 | — | — |
| kJ | 7 | — | 24 | 9 | — | 15 | 157 | 109 | 36 | — | — | — | — | — | 38 | 62 | — | — | 18 | — | — |
Wind waves Height (m) Direction Period (s) | — | ESE 5 | ESE 4 | N 4 | N 4 | NNW 3 | NW 4 | NNW 4 | WNW 3 | WSW 7 | — | NW 3 | WNW 4 | — | — | — | — | NW 3 | NNW 4 | NW 4 | — |
| kJ | — | 11 | 5 | 18 | 27 | 7 | 7 | 13 | 4 | 84 | — | 1 | 8 | — | — | — | — | 3 | 12 | 12 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 12 | 92 | 72 | 0 | 0 | 6 | 8 | 8 | 15 | 8 | 13 | 0 | 0 | 8 | 0 | 0 | 34 | 0 | 0 |
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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