Surf Forecasts:
Thirroul surf forecast from 11 Sep 2026:
- Best quality surf: Thursday 17 Sep, 10PM (local time) - 6ft (1.8m), 9s period, SSE swell with cross-offshore winds.
- Most powerful swell: Wednesday 16 Sep, 10PM (local time) - 11ft (3.5m), 10s period, S swell with 2,473 kJ wave energy.
- Next surfable swell (1★+): Saturday 12 Sep, 1AM (local time) - 3.5ft (1.1m), 10s period with SSE 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 Saturday (Sep 12) at 1AM. The primary swell is predicted to be 1.1m and 10s period with a secondary swell of 0.3m and 19s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Thirroul in the next 16 days are 3.5m 10s and forecast to arrive on Wednesday (Sep 16) at 10PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 6s period and expected on Monday (Sep 14) at 1AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Sat 12th Sep) | 3.5ft (1.1m) 10s |
| Best Surf | 10PM (Thu 17th Sep) | 6ft (1.8m) 9s |
| Most Powerful | 10PM (Wed 16th Sep) | 11ft (3.5m) 10s |
Table - best surf conditions forecast for Thirroul over the next 16 days.
The Lowdown
Alright, Rusty here, let’s chew through this sixteen-day window for Thirroul.
Right off the bat, the water’s about 64° with a normal temp for this time of year, nothing crazy. But the first few days? Pretty bleak. We’re looking at a big gap in any decent surf to start, with a lot of small, choppy, and crummy conditions.
The first glimmer of something worthwhile shows up on Saturday the 14th, early. Thirroul is clean with a light offshore breeze and a 4ft swell coming from the NE. The period is short, about 7 seconds, so not much punch, but the combined energy is moderate (296). It’ll be rideable and clean on that beach and reef setup, but it’s a mellow start.
Now, for the brave souls, Wednesday the 16th brings some serious size. We’re talking 10ft to 12ft from the south with the combined energy going through the roof (1810 to 2085). The wind is a fresh cross-shore, so it’s going to be lumpy and choppy. This is big, powerful, and strictly for experts only. Not a beginner’s day by any stretch.
Your true standout, the one to plan for, is Saturday the 26th. The morning is glassy – dead flat calm – with a solid 7ft NE swell. The combined energy is strong at 894, and that glassy surface is going to make Thirroul smooth and lined up. The period is 8 seconds, so it’s not a long-period groundswell, but with those clean conditions and that size, it’s the best session on the whole forecast. The swell direction is off from the optimum, but the quality of the conditions makes up for it.
The rest of the second week has a few small, clean moments around the 18th and 19th with tiny ankle-to-knee high waves, but nothing that’s going to get you out of bed early. The final days from the 20th onward are mostly flat and weak.
So, here’s the call: a slow, frustrating start, a big and rowdy mid-week for the hardcore, and a gorgeous, glassy Saturday the 26th as the real gem. That’s the one.
Rusty
Short Range ForecastSome drizzle, heaviest during Mon afternoon. Warm (max 25°C on Mon morning, min 12°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Tue afternoon. Warm (max 20°C on Tue morning, min 9°C on Tue night). Winds increasing (light winds from the S on Tue morning, fresh winds from the S by Wed morning). | ||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | ||||||||||||||
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) | SSE 10 | SSE 11 | SSE 10 | SSE 9 | S 10 | S 10 | S 10 | NE 7 | S 10 | NE 6 | NE 7 | NE 7 | S 9 | S 9 | S 10 | S 10 | SSE 10 | S 9 | SSE 9 |
Wave Graph  | |||||||||||||||||||
 kJ | 235 | 259 | 170 | 118 | 108 | 100 | 106 | 124 | 56 | 58 | 62 | 39 | 1569 | 1464 | 2252 | 2340 | 1819 | 1064 | 423 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross | cross-off | cross | cross | off | cross-off | cross | cross-off | cross | cross-on | cross | cross | cross | cross | cross | cross-on | off |
High Tide | 8:46AM1.41m | 8:57PM1.46m | 9:23AM1.44m | 9:37PM1.35m | 9:59AM1.44m | 10:18PM1.22m | 10:37AM1.41m | 11:00PM1.09m | 11:17AM1.36m | 11:46PM0.98m | 12:02PM1.30m | 00:43AM0.90m | |||||||
Low Tide | 2:37AM0.06m | 2:48PM0.16m | 3:10AM0.12m | 3:33PM0.18m | 3:42AM0.20m | 4:18PM0.23m | 4:14AM0.28m | 5:05PM0.29m | 4:47AM0.37m | 5:56PM0.37m | 5:23AM0.46m | 6:56PM0.43m | |||||||
 |  |  | | | |  | |  | | | |  | | | | | | | |
 | — | 6:01 | — | — | 5:58 | — | — | 5:58 | — | — | 5:56 | — | — | 5:54 | — | — | 5:54 | — | — |
 | — | — | 5:45 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — | 5:47 | — |
mm | — | — | — | — | — | — | — | — | 1 | — | — | 1 | 2 | — | — | — | — | — | — |
Temp °C | 13 | 20 | 18 | 13 | 21 | 19 | 16 | 25 | 22 | 17 | 20 | 18 | 11 | 14 | 14 | 13 | 14 | 14 | 10 |
Feels °C | 13 | 16 | 14 | 12 | 17 | 15 | 15 | 22 | 20 | 16 | 18 | 16 | 4 | 5 | 6 | 5 | 9 | 10 | 8 |
Swell 1 Height (m) Direction Period (s) | SSE 10 | SSE 11 | SSE 10 | SSE 9 | S 10 | S 10 | NE 6 | NE 7 | NE 6 | NE 6 | NE 7 | S 6 | NE 7 | ENE 14 | NE 12 | E 13 | SSE 10 | SSE 9 | SSE 9 |
| kJ | 235 | 259 | 170 | 118 | 108 | 100 | 56 | 54 | 35 | 58 | 62 | 33 | 7 | 20 | 6 | 3 | 1382 | 796 | 423 |
Swell 2 Height (m) Direction Period (s) | SSE 19 | SSE 19 | SSE 20 | NE 4 | SSE 16 | ENE 13 | S 10 | S 11 | S 10 | SSE 10 | S 9 | NE 7 | E 14 | ENE 14 | E 15 | — | E 13 | S 18 | E 13 |
| kJ | 70 | 70 | 77 | 9 | 26 | 17 | 106 | 85 | 56 | 31 | 15 | 39 | 4 | 19 | 4 | — | 3 | 25 | 3 |
Swell 3 Height (m) Direction Period (s) | E 13 | ENE 14 | ENE 14 | SSE 19 | ENE 13 | — | E 13 | E 13 | ENE 13 | E 12 | E 13 | S 9 | S 17 | — | — | — | — | E 13 | — |
| kJ | 14 | 19 | 19 | 74 | 17 | — | 13 | 13 | 17 | 12 | 3 | 7 | 6 | — | — | — | — | 3 | — |
Wind waves Height (m) Direction Period (s) | — | — | ENE 3 | NNW 2 | NE 5 | NE 5 | NNE 6 | NE 7 | NW 2 | — | SW 3 | E 3 | S 9 | S 9 | S 10 | S 10 | S 10 | S 9 | — |
| kJ | — | — | 6 | 1 | 8 | 37 | 72 | 124 | 1 | — | 1 | 6 | 1569 | 1464 | 2252 | 2340 | 1819 | 1064 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 40 | 0 | 0 | 94 | 0 | 6 | 247 | 0 | 0 | 52 | 0 | 5 | 1261 | 5 | 690 | 658 | 39 | 5 | 79 |
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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