
Surf Forecasts:
Thirroul surf forecast from 6 Sep 2026:
- Best quality surf: Thursday 10 Sep, 7AM (local time) - 10ft (3.0m), 10s period, S swell with cross-offshore winds.
- Most powerful swell: Wednesday 9 Sep, 10PM (local time) - 11ft (3.5m), 10s period, SSE swell with 1,997 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 1AM (local time) - 6ft (1.8m), 8s 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 Monday (Sep 07) at 1AM. The primary swell is predicted to be 1.8m and 8s period with a secondary swell of 0.2m and 10s. 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 3.5m 10s and forecast to arrive on Wednesday (Sep 09) at 10PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Wednesday (Sep 09) at 10AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Mon 7th Sep) | 6ft (1.8m) 8s |
| Best Surf | 7AM (Thu 10th Sep) | 10ft (3.0m) 10s |
| Most Powerful | 10PM (Wed 9th Sep) | 11ft (3.5m) 10s |
Table - best surf conditions forecast for Thirroul over the next 16 days.
The Lowdown
Alright, this is Rusty, and I’ve got the local gen on what’s coming up for us here at Thirroul over the next couple of weeks. Let’s get straight into it.
The first real chance to get wet doesn’t come until Monday the 7th. Before that, Sunday the 6th is a complete write-off with poor surf conditions all day, so don’t even bother.
Monday the 7th morning looks alright – we’ve got a clean 4 ft swell from the SSE with a light cross-off breeze. It’s not huge, but it’s a start. The combined swell energy is modest at 245, so nothing too powerful. The water temp is sitting at 64°, which is pretty much normal for this time of year.
Tuesday the 8th morning is where things get a bit more interesting. That swell jumps up to 8 ft from the south, with a period of 9 seconds. The combined energy is a solid 2192, so there’s some proper grunt behind it. Wind is gentle and cross-shore, keeping it reasonably clean, but at 8 ft this is getting into expert territory. It’s a beach and reef setup here, so it can handle that size, but it’s not for the faint-hearted.
The standout window, and I mean the one to circle on the calendar, hits Saturday the 12th morning. This is the best of the whole run. We’ve got 6 ft of SSE swell rolling in with a period of 9 seconds, giving a combined energy of 643. The real winner here is the wind – it’s glassy, dead calm. That’s as good as it gets for clean, lined-up waves. The swell direction is right in the sweet spot for Thirroul’s optimum. This is the session to chase.
Sunday the 13th keeps the good vibes going with a glassy afternoon and 4 ft of SSE swell, period pushing 11 seconds. That longer period means the waves will have a bit more shape and energy, but at a point break like this, it’ll be a treat. The morning is also clean with a cross-off breeze. This is a solid second day.
Monday the 14th morning stays clean with 3 ft swell, but the energy drops off a bit. Still a nice, mellow option if you’re keen.
Then we hit a bit of a gap. Tuesday the 15th morning throws a big 10 ft south swell at us, but with onshore wind and a very high combined energy of 2713, this is more for the brave or the kites. The water will be a mess. After that, the swell drops and the wind patterns get messy, with only brief windows of clean but small surf through the 16th.
Wednesday the 16th morning is a last little nod – 4 ft from the south, clean with a cross-off breeze. Worth a look if you’re desperate.
From Thursday the 17th to the end of the forecast on Monday the 21st, it’s mostly poor conditions, small swell, and lumpy wind. The combined energy drops into the double digits at times, and the surf just isn’t there. It’s a long, quiet end to the period.
So, to wrap it up: Saturday the 12th morning is the absolute standout – glassy, clean, decent size. Sunday the 13th is a close second. The rest is a mixed bag with a few clean but smaller windows, and a lot of time where you’re better off waiting for the next swell.
Rusty
Short Range ForecastLight rain (total 2mm), mostly falling on Mon afternoon. Warm (max 20°C on Sun morning, min 10°C on Tue night). Winds increasing (light winds from the NW on Sun night, fresh winds from the S by Mon night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 18°C on Fri morning, min 9°C on Wed night). Winds decreasing (fresh winds from the S on Wed afternoon, calm by Thu afternoon). | ||||||||||||||||||||
Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | |||||||||||||||
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) | SSW 6 | S 10 | S 8 | SSE 8 | SE 8 | S 9 | S 9 | SSE 10 | SSE 9 | SSE 9 | SSE 8 | S 10 | S 10 | S 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 9 | SSE 10 | SSE 11 |
Wave Graph | |||||||||||||||||||||
47 | 643 | 472 | 235 | 184 | 1437 | 1210 | 795 | 397 | 245 | 526 | 1656 | 1732 | 1106 | 988 | 653 | 680 | 721 | 564 | 463 | 415 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-off | cross-off | cross-on | cross | cross | on | cross-off | cross | cross-on | cross | cross-on | cross-on | off | cross-on | on | cross-off | glassy | cross-on | cross-off |
High Tide | 3:54PM1.47m | 5:00AM1.00m | 4:59PM1.53m | 5:58AM1.09m | 5:56PM1.59m | 6:46AM1.18m | 6:46PM1.62m | 7:28AM1.27m | 7:32PM1.61m | 8:08AM1.35m | 8:15PM1.56m | 8:46AM1.41m | 8:57PM1.46m | ||||||||
Low Tide | 10:57PM0.22m | 10:24AM0.42m | 11:54PM0.14m | 11:28AM0.35m | 00:42AM0.07m | 12:24PM0.27m | 1:23AM0.03m | 1:15PM0.21m | 2:01AM0.03m | 2:02PM0.17m | 2:37AM0.06m | 2:48PM0.16m | 3:10AM0.12m | ||||||||
6:09 | — | — | 6:07 | — | — | 6:05 | — | — | 6:05 | — | — | 6:03 | — | — | 6:01 | — | — | 6:01 | — | — | |
— | 5:39 | — | — | 5:40 | — | — | 5:42 | — | — | 5:42 | — | — | 5:43 | — | — | 5:44 | — | — | 5:45 | — | |
mm | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 20 | 18 | 14 | 20 | 17 | 14 | 15 | 15 | 11 | 14 | 14 | 14 | 15 | 14 | 12 | 18 | 17 | 12 | 17 | 16 | 12 |
Feels °C | 16 | 14 | 12 | 17 | 14 | 9 | 12 | 13 | 9 | 8 | 8 | 8 | 10 | 11 | 9 | 16 | 14 | 10 | 14 | 13 | 9 |
Swell 1 Height (m) Direction Period (s) | NE 7 | NE 7 | S 8 | SSE 8 | S 8 | E 10 | SSE 9 | SSE 10 | SSE 9 | SSE 9 | E 13 | ESE 11 | S 10 | S 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 9 | SSE 10 | SSE 11 |
18 | 7 | 472 | 235 | 112 | 9 | 980 | 795 | 397 | 245 | 3 | 42 | 1161 | 904 | 988 | 653 | 680 | 721 | 564 | 463 | 415 | |
Swell 2 Height (m) Direction Period (s) | E 11 | E 11 | E 10 | NE 8 | E 10 | — | E 11 | E 10 | E 10 | E 10 | S 16 | E 16 | ESE 10 | SSE 16 | ESE 9 | E 15 | E 14 | E 13 | SSE 18 | SSE 19 | SSE 20 |
9 | 9 | 8 | 2 | 8 | — | 2 | 2 | 2 | 2 | 5 | 5 | 34 | 344 | 8 | 4 | 4 | 14 | 64 | 136 | 301 | |
Swell 3 Height (m) Direction Period (s) | S 15 | — | NE 6 | E 10 | NE 8 | — | — | — | N 9 | — | E 17 | — | SSE 23 | ESE 10 | S 23 | E 10 | E 10 | E 9 | E 14 | ENE 14 | ENE 13 |
4 | — | 2 | 8 | 2 | — | — | — | 2 | — | 6 | — | 100 | 18 | 42 | 2 | 2 | 2 | 15 | 19 | 17 | |
Wind waves Height (m) Direction Period (s) | SSW 6 | S 10 | — | — | SE 8 | S 9 | S 9 | — | — | SW 3 | SSE 8 | S 10 | S 10 | S 10 | — | — | — | — | — | — | NW 2 |
47 | 643 | — | — | 184 | 1437 | 1210 | — | — | 8 | 526 | 1656 | 1732 | 1106 | — | — | — | — | — | — | 1 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 5 | 130 | 0 | 0 | 328 | 86 | 7 | 36 | 0 | 48 | 86 | 79 | 5 | 36 | 0 | 36 | 86 | 0 | 0 | 51 | 0 |
Best forecast wave conditions in Illawarra | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.










