Surf Forecasts:
Thirroul surf forecast from 2 Sep 2026:
- Best quality surf: Thursday 10 Sep, 1AM (local time) - 7ft (2.1m), 7s period, SSE swell with cross-offshore winds.
- Most powerful swell: Tuesday 8 Sep, 4AM (local time) - 7ft (2.1m), 8s period, SSE swell with 561 kJ wave energy.
- Next surfable swell (1★+): Thursday 3 Sep, 1AM (local time) - 1.5ft (0.5m), 10s 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 Thursday (Sep 03) at 1AM. The primary swell is predicted to be 0.5m and 10s period with a secondary swell of 0.3m and 10s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Thirroul in the next 16 days are 2.1m 8s and forecast to arrive on Tuesday (Sep 08) at 4AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Saturday (Sep 05) at 4PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Thu 3rd Sep) | 1.5ft (0.5m) 10s |
| Best Surf | 1AM (Thu 10th Sep) | 7ft (2.1m) 7s |
| Most Powerful | 4AM (Tue 8th Sep) | 7ft (2.1m) 8s |
Table - best surf conditions forecast for Thirroul over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down what’s coming at Thirroul over the next couple weeks.
It’s a slow start, no doubt. The first few days are tiny – knee to waist-high at best (around 2ft) with cross-off winds that keep the surface clean, but there’s no energy in the water. Swell energy is weak (106 down to 91). Just a chance to float around.
Friday morning the 4th shows a little life: a 3ft south swell with a clean offshore breeze (10 km/h). Energy ticks up to moderate (185), but the waves are still ordinary. Nothing to write home about.
Saturday the 5th is the same story – clean but too small to care.
Then we hit a real flat spot. From Sunday the 6th through Tuesday the 8th, the wind goes onshore or cross-on, and the swell gets chopped up. Tuesday morning the 8th has some size (5ft) but it’s short-period and lumpy. No thanks.
Wednesday the 9th is blown out with 30 km/h cross-onshore winds. Kite surfers might be interested, but not paddle surfers.
Now here’s the real deal. Thursday the 10th brings a big spike in energy. Morning shows 8ft of SSE swell with strong combined energy (1151), but it’s still a bit lumpy. The afternoon, though, is a freak event – a 4ft SSE swell with an insane 21-second period. The energy is massive (2710). That’s groundswell of the highest order. Glassy conditions on Friday the 11th morning with a clean 7ft SSE swell (11-second period, energy 1023). This is the standout of the entire forecast. For experienced surfers only – that long period will make it dumpy at the beach, but at the reef and point it’ll be world-class. Get out early Friday the 11th.
After that, it fades. Saturday the 12th has a clean morning with 4ft but the period drops. By Sunday the 13th it’s back to tiny, onshore slop. There’s a last little window on Wednesday the 16th morning – glassy, 4ft SSE swell, period 10 seconds, energy 375. Decent, but not a patch on that Friday.
So the big takeaway: the first week is a wash. Friday the 11th of September, early morning, is the only true standout. Don’t miss it.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Sat morning, min 12°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Mon afternoon. Warm (max 22°C on Mon morning, min 10°C on Sun night). Winds decreasing (fresh winds from the W on Sat night, calm by Sun afternoon). | ||||||||||||||||||
Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | ||||||||||||||
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) | S 10 | S 10 | S 10 | SSE 10 | S 10 | S 8 | S 10 | S 9 | S 10 | S 9 | S 11 | S 9 | SSE 8 | S 9 | S 9 | SSE 8 | SSE 8 | SSE 8 | S 9 |
Wave Graph  | |||||||||||||||||||
 kJ | 49 | 53 | 52 | 32 | 158 | 55 | 56 | 41 | 45 | 16 | 344 | 196 | 109 | 198 | 151 | 427 | 414 | 221 | 125 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross-off | cross-off | off | cross | cross-off | cross-off | off | cross-off | cross | on | off | off | cross-on | cross | cross | on | off |
High Tide | 11:50PM1.11m | 12:22PM1.41m | 00:56AM1.01m | 1:27PM1.40m | 2:19AM0.94m | 2:40PM1.42m | 3:46AM0.95m | 3:54PM1.47m | 5:00AM1.00m | 4:59PM1.53m | 5:58AM1.09m | 5:56PM1.59m | |||||||
Low Tide | 5:45AM0.32m | 7:04PM0.34m | 6:40AM0.40m | 8:25PM0.34m | 7:50AM0.45m | 9:47PM0.30m | 9:09AM0.46m | 10:57PM0.22m | 10:24AM0.42m | 11:54PM0.14m | 11:28AM0.35m | 00:42AM0.07m | |||||||
 |  | |  | | | | | | | | | |  |  |  | | | | |
 | — | 6:13 | — | — | 6:11 | — | — | 6:09 | — | — | 6:09 | — | — | 6:07 | — | — | 6:05 | — | — |
 | — | — | 5:37 | — | — | 5:38 | — | — | 5:39 | — | — | 5:39 | — | — | 5:40 | — | — | 5:42 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 1 | — | — | — |
Temp °C | 18 | 23 | 22 | 15 | 21 | 21 | 15 | 26 | 26 | 17 | 19 | 17 | 12 | 22 | 19 | 13 | 16 | 16 | 12 |
Feels °C | 16 | 17 | 17 | 10 | 17 | 19 | 13 | 21 | 21 | 10 | 15 | 13 | 11 | 19 | 15 | 8 | 13 | 14 | 11 |
Swell 1 Height (m) Direction Period (s) | S 10 | S 10 | S 10 | SSE 10 | S 10 | S 8 | S 10 | S 9 | NE 6 | NE 6 | S 11 | S 9 | SSE 8 | S 9 | S 9 | E 10 | SSE 8 | SSE 8 | S 9 |
| kJ | 49 | 53 | 52 | 32 | 158 | 55 | 56 | 41 | 16 | 9 | 344 | 196 | 109 | 198 | 151 | 9 | 414 | 221 | 125 |
Swell 2 Height (m) Direction Period (s) | ENE 10 | ENE 10 | NE 6 | NE 7 | NE 7 | ENE 10 | S 7 | E 9 | S 10 | S 9 | NE 6 | S 12 | S 11 | NNE 7 | SSE 11 | NE 8 | ENE 11 | ENE 10 | SE 8 |
| kJ | 19 | 19 | 9 | 7 | 7 | 19 | 26 | 7 | 45 | 16 | 6 | 104 | 88 | 5 | 23 | 3 | 11 | 9 | 68 |
Swell 3 Height (m) Direction Period (s) | SSE 12 | NE 6 | ENE 10 | ENE 10 | ENE 10 | NE 7 | ENE 10 | S 16 | E 9 | SSW 5 | E 11 | NE 6 | NNE 6 | E 10 | E 10 | NE 5 | N 10 | NE 6 | ENE 10 |
| kJ | 29 | 7 | 19 | 19 | 19 | 8 | 9 | 19 | 7 | 3 | 9 | 6 | 4 | 8 | 8 | 1 | 2 | 1 | 9 |
Wind waves Height (m) Direction Period (s) | NW 2 | — | W 3 | WSW 3 | W 3 | ENE 3 | — | NNE 5 | WNW 4 | SW 4 | — | — | — | NNW 3 | S 8 | SSE 8 | — | — | — |
| kJ | 1 | — | 4 | 6 | 1 | 1 | — | 15 | 12 | 9 | — | — | — | 3 | 142 | 427 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 2 | 0 | 5 | 2 | 0 | 0 | 2 | 0 | 0 | 10 | 7 | 2 | 94 | 0 | 0 | 245 | 27 | 5 | 94 |
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.
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