
Surf Forecasts:
Thirroul surf forecast from 9 Aug 2026:
- Best quality surf: Tuesday 11 Aug, 7PM (local time) - 4.5ft (1.4m), 11s period, S swell with offshore winds.
- Most powerful swell: Thursday 13 Aug, 1PM (local time) - 7.5ft (2.3m), 9s period, S swell with 880 kJ wave energy.
- Next surfable swell (1★+): Tuesday 11 Aug, 7PM (local time) - 4.5ft (1.4m), 11s period with S swell.
Best Forecast Surf Conditions for Thirroul this week:
The surf forecast for Thirroul over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Aug 11) at 7PM. The primary swell is predicted to be 1.4m and 11s period with a secondary swell of 0.5m and 9s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Thirroul in the next 16 days are 2.3m 9s and forecast to arrive on Thursday (Aug 13) at 1PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 4s period and expected on Monday (Aug 10) at 4PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7PM (Tue 11th Aug) | 4.5ft (1.4m) 11s |
| Best Surf | 7PM (Tue 11th Aug) | 4.5ft (1.4m) 11s |
| Most Powerful | 1PM (Thu 13th Aug) | 7.5ft (2.3m) 9s |
Table - best surf conditions forecast for Thirroul over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let's break down what Thirroul's got for us over the next couple of weeks. It's a slow start, but there's some real firepower later on.
Right now, the water's sitting at about 64°F, which is right on the money for this time of year, so no need to go digging for the 5/4.
The first few days are a total bust. Monday the 10th has some size, about 6ft from the ENE, but that 30 km/h NNW cross-off wind is just too strong and messy. The combined energy is a moderate 497, but the conditions are poor. Tuesday the 11th stays rough, though the afternoon brings a shift with a 5ft south swell and a cleaner cross-off wind, making it just barely rideable. Wednesday the 12th is tiny at 3ft, so not worth the paddle.
Thursday the 13th sees a jump back up to 6ft-7ft south swell, but the cross-shore and cross-onshore winds keep things lumpy and marginal. The afternoon has the combined energy cranking up to 1029, which is strong, but the wind is ruining it.
Now, here's a little gem. Friday morning the 14th is the standout for the near-term. The swell drops to 4ft from the south, but the wind goes glassy—absolutely dead calm. The combined energy is a light 239, but that glassy surface means clean, smooth waves. It won't be big, but for a fun, easy session, that's your pick.
We hit a rough patch from Saturday the 15th right through to Wednesday the 19th. The swell drops and the wind stays onshore or cross-onshore, with the energy levels falling below 100 at times. Conditions are poor to marginal, and honestly, you'd be fighting the wind more than riding the waves.
Thursday the 20th offers another glassy morning with 3ft from the ENE and a combined energy of 301. Good conditions again, but small. Friday the 21st morning is also clean with 4ft from the east.
But here's the real deal. The true standout is Sunday the 23rd into Monday the 24th. Sunday morning, the swell jumps to 6ft from the south with a clean cross-off northerly breeze at 15 km/h. The combined energy is a solid 675, and the forecast is for very good surf conditions. This one's got some punch and will be clean. Then Monday the 24th keeps the energy high with 6ft from the southeast and offshore WNW winds—gentle offshore and clean. That's your best window right there, with combined energy in the 700s both days. Tuesday the 25th morning brings a 4ft groundswell from the east with a 13-second period—nice and long—and clean conditions, though that long period might make the beach break a bit straight, so keep that in mind.
So, the long and short of it: the first week is mostly a dud, with just Friday the 14th offering a small, glassy reprieve. The second week is where the magic is, with Sunday the 23rd and Monday the 24th being the absolute best on offer. Get out there then.
Rusty.
Short Range ForecastMostly dry. Very mild (max 19°C on Tue morning, min 9°C on Tue night). Winds decreasing (fresh winds from the NW on Mon morning, light winds from the NW by Tue night). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sat morning. Very mild (max 16°C on Thu morning, min 10°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | |||||||||||||||
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) | ENE 9 | NE 9 | NE 10 | ENE 10 | S 11 | S 10 | S 9 | S 9 | SSW 8 | S 9 | S 9 | S 8 | S 9 | S 8 | SSE 7 | SSE 6 | SSE 6 | SSE 6 | S 7 | SSE 6 | SSE 6 |
Wave Graph | |||||||||||||||||||||
497 | 424 | 134 | 81 | 599 | 259 | 106 | 106 | 112 | 473 | 582 | 115 | 215 | 186 | 82 | 53 | 52 | 85 | 240 | 160 | 70 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | cross-off | cross-off | cross-off | off | off | off | cross-off | cross | cross-on | cross-off | glassy | on | cross-off | cross-on | cross-on | cross | cross | cross-on | cross-on |
High Tide | 6:08PM1.67m | 7:01AM1.10m | 7:01PM1.73m | 7:50AM1.17m | 7:50PM1.75m | 8:36AM1.23m | 8:37PM1.72m | 9:19AM1.29m | 9:21PM1.63m | 10:01AM1.32m | 10:04PM1.51m | 10:42AM1.34m | 10:47PM1.35m | ||||||||
Low Tide | 11:31AM0.33m | 1:02AM0.05m | 12:29PM0.28m | 1:50AM-0.01m | 1:23PM0.23m | 2:34AM-0.04m | 2:14PM0.20m | 3:15AM-0.02m | 3:03PM0.20m | 3:53AM0.03m | 3:52PM0.23m | 4:29AM0.10m | 4:42PM0.28m | ||||||||
6:41 | — | — | 6:41 | — | — | 6:39 | — | — | 6:39 | — | — | 6:37 | — | — | 6:35 | — | — | 6:35 | — | — | |
— | 5:21 | — | — | 5:22 | — | — | 5:22 | — | — | 5:22 | — | — | 5:23 | — | — | 5:24 | — | — | 5:25 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | 3 | 2 |
Temp °C | 16 | 13 | 14 | 19 | 18 | 12 | 18 | 18 | 13 | 16 | 15 | 11 | 15 | 15 | 13 | 14 | 15 | 14 | 15 | 14 | 14 |
Feels °C | 8 | 6 | 7 | 13 | 12 | 7 | 13 | 13 | 7 | 11 | 11 | 8 | 13 | 13 | 11 | 11 | 10 | 9 | 11 | 11 | 10 |
Swell 1 Height (m) Direction Period (s) | ENE 9 | NE 9 | NE 10 | ENE 10 | S 11 | S 10 | S 9 | S 9 | ENE 9 | S 9 | S 8 | S 8 | S 9 | S 8 | SSE 7 | SSE 6 | ENE 10 | ENE 10 | ESE 9 | SSE 12 | SSE 6 |
497 | 424 | 134 | 81 | 599 | 259 | 106 | 106 | 49 | 473 | 415 | 115 | 215 | 186 | 79 | 53 | 9 | 9 | 8 | 28 | 70 | |
Swell 2 Height (m) Direction Period (s) | — | S 13 | E 13 | S 7 | ENE 9 | ENE 9 | ENE 9 | ENE 10 | SE 13 | ENE 10 | ENE 10 | S 9 | ENE 10 | ENE 9 | SSE 20 | ENE 9 | SE 8 | ESE 7 | ENE 10 | ESE 9 | S 11 |
— | 3 | 4 | 38 | 59 | 49 | 49 | 52 | 7 | 31 | 30 | 64 | 18 | 17 | 82 | 9 | 3 | 5 | 10 | 15 | 37 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | S 12 | — | — | — | S 14 | S 16 | — | NE 7 | ENE 10 | S 18 | SSE 19 | ENE 9 | SSE 16 | S 16 | ESE 7 | SSE 18 | ENE 10 | ESE 8 |
— | — | — | 11 | — | — | — | 4 | 5 | — | 2 | 18 | 6 | 37 | 17 | 24 | 5 | 5 | 30 | 11 | 6 | |
Wind waves Height (m) Direction Period (s) | NNW 4 | NW 4 | W 4 | W 4 | — | WNW 4 | NW 3 | WSW 3 | SSW 8 | WSW 3 | S 9 | W 3 | — | — | — | — | SSE 6 | SSE 6 | S 7 | SSE 6 | — |
22 | 41 | 18 | 6 | — | 5 | 1 | 3 | 112 | 1 | 582 | 1 | — | — | — | — | 52 | 85 | 240 | 160 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 51 | 52 | 109 | 2 | 2 | 0 | 0 | 0 | 2 | 2 | 5 | 0 | 0 | 36 | 0 | 5 | 130 | 5 | 39 | 27 | 39 |
Best forecast wave conditions in Illawarra | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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Information about the Thirroul Surf forecast
The above surf forecast table for Thirroul provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Thirroul can be found by selecting the local surf guide option on the grey menu. Our Thirroul 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 (Thirroul) 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 Thirroul 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.
Are you planning a holiday in Illawarra? If you are looking for accommodation near Thirroul, camping, hotels and holiday cottages in Illawarra, consider staying in Wollongong which is 12 km (7 miles) away. Other places in and around Illawarra where you can find information about places to rent, and car hire include Port Kembla which is 19 km (12 miles) away, Engadine, Cronulla and Caringbah.











