Surf Forecasts:
Thirroul surf forecast from 10 Sep 2026:
- Best quality surf: Friday 11 Sep, 4AM (local time) - 5.5ft (1.7m), 10s period, SSE swell with cross-offshore winds.
- Most powerful swell: Wednesday 16 Sep, 7AM (local time) - 8ft (2.5m), 9s period, S swell with 1,171 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 4AM (local time) - 5.5ft (1.7m), 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 Friday (Sep 11) at 4AM. The primary swell is predicted to be 1.7m and 10s period with a secondary swell of 0.1m and 15s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Thirroul in the next 16 days are 2.5m 9s and forecast to arrive on Wednesday (Sep 16) 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 0.8m 5s period and expected on Sunday (Sep 13) at 10PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Fri 11th Sep) | 5.5ft (1.7m) 10s |
| Best Surf | 4AM (Fri 11th Sep) | 5.5ft (1.7m) 10s |
| Most Powerful | 7AM (Wed 16th Sep) | 8ft (2.5m) 9s |
Table - best surf conditions forecast for Thirroul over the next 16 days.
The Lowdown
Alright, Rusty here. Let's have a look at what's cookin' for Thirroul over the next couple of weeks.
Right off the bat, we've got a bit of a mixed bag. The first real standout is this Friday morning, the 11th of September. The swell is coming in at a solid 5 ft from the SSE, with a period of 10 seconds and a combined energy of 441 (moderate). The wind is glassy, dead calm from the SE at only 3 mph. That's going to make for some clean, smooth waves. The water temp is sitting about average for this time of year. This is the pick of the whole run, no question about it. The wave comment says "expect good surf conditions," and I'm with that.
The rest of the first week is pretty ordinary. Saturday the 12th sees the swell drop to 3 ft, but the wind swings onshore and picks up, making it choppy and messy. Sunday and Monday look even smaller and uglier. A small window of "clean" conditions shows up on Monday morning, the 14th of September, but the swell is only 2 ft – it's surfable, but you'd be fighting for scraps.
Then we get a spike on Wednesday the 16th of September. The swell jumps to 8 ft from the S, with a period of 9 seconds and a big combined energy of 942 (strong). That's a solid amount of water moving, but the wind is a moderate cross-shore at 16 mph. The wave comment says "marginal surf forecast or questionable tide conditions." This one's a bit of a wildcard; it could be a beast, but it's going to be a messy, choppy beast. For experienced surfers only, and even then, it's a gamble.
The best chance of a decent session after Friday is on Thursday morning, the 17th of September. We've got a 4 ft swell from the S, period of 10 seconds, combined energy of 240 (moderate), and the wind is a light cross-offshore at 6 mph. The wave comment says "expect good surf conditions." It's not as clean as Friday, but it's a solid, surfable wave.
Looking further out, the second week is a bit of a desert. There's a glimmer on Saturday the 19th of September with a 2 ft swell and clean offshore wind (WNW, 9 mph), but it's tiny. The next real highlight is on Sunday the 20th of September: a 3 ft swell from the S, period of 10 seconds, with a gentle offshore wind from the NW at 9 mph. The wave comment says "expect good surf conditions." That's a promising one for the weekend, but it's a long way out, so don't bank on it.
After that, it's a long stretch of small, weak, and onshore conditions. The swell energy drops right off, dipping into double digits (65, 24). There's a nine-day run from the 20th to the 28th of September where there's no real recommendable surf. So, if you're looking for a wave, your best bet is this Friday morning, the 11th of September, at Thirroul. Get in the water while it's clean.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Sun morning, min 11°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Tue night. Warm (max 27°C on Mon morning, min 12°C on Wed afternoon). Wind will be generally light. | ||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | ||||||||||||||
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 10 | SSE 9 | SSE 10 | SSE 11 | SSE 10 | SSE 9 | SSE 11 | S 10 | NE 6 | S 11 | S 10 | SSE 10 | ENE 6 | SSE 7 | SSE 8 | S 9 | S 8 | SSE 10 |
Wave Graph  | |||||||||||||||||||
 kJ | 640 | 435 | 314 | 230 | 254 | 170 | 118 | 150 | 102 | 106 | 83 | 55 | 31 | 26 | 102 | 639 | 919 | 355 | 435 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | glassy | on | cross-off | cross | cross-on | cross-off | cross | cross | off | cross-off | cross | cross-off | cross-on | cross-on | cross-on | cross | cross-on | off |
High Tide | 8:08AM1.35m | 8:15PM1.56m | 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 | |||||||
Low Tide | 2:01AM0.03m | 2:02PM0.17m | 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 | |||||||
 |  |  | | | |  | | | |  | | | |  |  | | | | |
 | — | 6:01 | — | — | 6:01 | — | — | 5:58 | — | — | 5:58 | — | — | 5:56 | — | — | 5:54 | — | — |
 | — | — | 5:44 | — | — | 5:45 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 2 | — | — | — |
Temp °C | 12 | 17 | 16 | 13 | 19 | 18 | 13 | 21 | 19 | 16 | 27 | 24 | 21 | 19 | 16 | 13 | 15 | 14 | 11 |
Feels °C | 10 | 15 | 14 | 12 | 16 | 15 | 12 | 17 | 15 | 16 | 24 | 22 | 19 | 18 | 13 | 8 | 10 | 10 | 10 |
Swell 1 Height (m) Direction Period (s) | SSE 10 | SSE 10 | SSE 9 | SSE 10 | SSE 11 | SSE 10 | SSE 9 | SSE 11 | S 10 | NE 6 | NE 6 | S 10 | ENE 6 | ENE 6 | NE 6 | NE 6 | E 14 | E 12 | SSE 10 |
| kJ | 640 | 435 | 314 | 230 | 254 | 170 | 118 | 150 | 102 | 33 | 31 | 55 | 21 | 26 | 12 | 1 | 4 | 3 | 435 |
Swell 2 Height (m) Direction Period (s) | ESE 9 | E 15 | E 14 | SSE 19 | SSE 19 | SSE 20 | NE 4 | SSE 16 | ENE 13 | S 10 | S 11 | ENE 13 | SSE 10 | S 9 | E 13 | E 14 | ENE 14 | E 15 | E 13 |
| kJ | 7 | 4 | 4 | 35 | 70 | 76 | 8 | 26 | 17 | 106 | 83 | 17 | 31 | 14 | 13 | 14 | 19 | 4 | 14 |
Swell 3 Height (m) Direction Period (s) | S 21 | E 10 | E 10 | E 13 | ENE 14 | ENE 14 | SSE 19 | ENE 13 | — | E 13 | E 13 | S 15 | E 12 | E 12 | — | S 17 | — | — | S 19 |
| kJ | 9 | 2 | 2 | 14 | 19 | 19 | 74 | 17 | — | 13 | 13 | 5 | 12 | 3 | — | 6 | — | — | 7 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | ENE 3 | NE 4 | NE 4 | NE 5 | NE 6 | — | NE 6 | — | S 6 | SSE 7 | SSE 8 | S 9 | S 8 | — |
| kJ | — | — | — | — | — | 3 | 13 | 4 | 41 | 98 | — | 36 | — | 22 | 102 | 639 | 919 | 355 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 79 | 0 | 6 | 94 | 0 | 2 | 436 | 0 | 0 | 2 | 0 | 39 | 118 | 86 | 86 | 39 | 0 |
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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