Surf Forecasts:
Thirroul surf forecast from 15 Sep 2026:
- Best quality surf: Thursday 17 Sep, 7AM (local time) - 8ft (2.5m), 10s period, SSE swell with cross-offshore winds.
- Most powerful swell: Wednesday 16 Sep, 10PM (local time) - 11ft (3.5m), 10s period, SSE swell with 2,413 kJ wave energy.
- Next surfable swell (1★+): Thursday 17 Sep, 7AM (local time) - 8ft (2.5m), 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 Thursday (Sep 17) at 7AM. The primary swell is predicted to be 2.5m and 10s period with a secondary swell of 0.1m and 13s. 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 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 0.4m 3s period and expected on Sunday (Sep 20) at 7AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Thu 17th Sep) | 8ft (2.5m) 10s |
| Best Surf | 7AM (Thu 17th Sep) | 8ft (2.5m) 10s |
| 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 mates, let’s talk Thirroul. The next couple weeks have a slow start, but there are a couple moments worth waking up for. Water temp is about 65°, which is normal for this time of year.
The first chance of something decent hits on Wednesday the 16th of September. There’s a big 10ft south swell, but it’s blown out by a fresh 30 km/h cross-shore wind – lumpy and rough. Not for the faint-hearted, and honestly, the setup looks better for kite surfing than a proper paddle. Energy is pumping (1838), but the quality is poor.
Thursday the 17th of September morning shapes up better. Swell drops to about 7ft from the SSE, with a light 10 km/h cross-shore breeze. It’s still on the bigger side, but for the experienced crew, this is a solid option with moderate energy (835) and cleaner conditions.
The real standout is Friday the 18th of September morning. Glassy conditions – dead calm. A clean 4ft SSE swell, light wind, and perfect conditions. This is the one to prioritise. Moderate wave energy (407) and clean surf on the beach and reef. Crowds can pop up though, so get in early.
From Saturday the 19th of September onward, it’s pretty quiet. Small swells, onshore winds, and not much to chase. There’s a brief glassy moment on Sunday the 20th of September afternoon, but it’s only 1ft. Hardly worth paddling out for.
Tuesday the 22nd of September morning has a 8ft south swell with a light cross-shore wind, but the period is short (8 seconds) and the conditions are marginal. One for the keeners only.
If you’ve got a window, Friday the 18th is your day.
Rusty.
Short Range ForecastSome drizzle, heaviest during Tue afternoon. Warm (max 21°C on Tue morning, min 8°C on Wed night). Winds decreasing (fresh winds from the S on Tue afternoon, calm by Thu afternoon). | Days 4-6 Weather SummaryMostly dry. Warm (max 30°C on Sun morning, min 16°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | |||||||||||||||
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) | NE 7 | SSE 6 | S 9 | S 10 | S 10 | S 10 | SSE 10 | SSE 9 | SSE 9 | SSE 9 | S 9 | S 9 | S 9 | S 9 | S 9 | SSE 9 | S 9 | S 10 | S 7 | SSE 9 | SSE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 50 | 90 | 1256 | 1818 | 1725 | 2155 | 825 | 488 | 315 | 295 | 211 | 110 | 113 | 87 | 43 | 28 | 27 | 17 | 155 | 471 | 678 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross | cross | cross-on | cross | cross | cross-on | off | glassy | cross-on | off | cross | cross | off | cross-off | glassy | off | cross-on | cross-on | cross-on |
High Tide | 10:37AM1.41m | 11:00PM1.09m | 11:17AM1.36m | 11:46PM0.98m | 12:02PM1.30m | 00:43AM0.90m | 12:58PM1.25m | 1:57AM0.85m | 2:06PM1.22m | 3:21AM0.85m | 3:17PM1.23m | 4:28AM0.90m | 4:18PM1.27m | ||||||||
Low Tide | 5:05PM0.29m | 4:47AM0.37m | 5:56PM0.37m | 5:23AM0.46m | 6:56PM0.43m | 6:08AM0.53m | 8:07PM0.47m | 7:08AM0.59m | 9:23PM0.47m | 8:26AM0.60m | 10:27PM0.42m | 9:42AM0.57m | 11:15PM0.36m | ||||||||
 |  |  | | | | | |  | | | | | | | | | |  |  |  | |
 | 5:56 | — | — | 5:54 | — | — | 5:54 | — | — | 5:52 | — | — | 5:50 | — | — | 5:50 | — | — | 5:48 | — | — |
 | — | 5:46 | — | — | 5:46 | — | — | 5:47 | — | — | 5:49 | — | — | 5:49 | — | — | 5:50 | — | — | 5:51 | — |
mm | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 |
Temp °C | 21 | 18 | 12 | 14 | 14 | 13 | 15 | 14 | 10 | 22 | 20 | 17 | 26 | 26 | 18 | 30 | 29 | 22 | 19 | 16 | 14 |
Feels °C | 19 | 16 | 7 | 6 | 6 | 6 | 11 | 11 | 8 | 18 | 18 | 12 | 22 | 23 | 15 | 27 | 27 | 19 | 17 | 13 | 10 |
Swell 1 Height (m) Direction Period (s) | NE 7 | NE 7 | NE 7 | ENE 14 | NE 12 | E 13 | SSE 10 | SSE 9 | SSE 9 | SSE 9 | S 9 | S 9 | S 9 | S 9 | S 9 | SSE 9 | S 9 | S 10 | S 7 | SSE 9 | S 15 |
| kJ | 50 | 38 | 7 | 20 | 6 | 3 | 825 | 488 | 315 | 295 | 211 | 110 | 113 | 87 | 43 | 28 | 27 | 17 | 155 | 471 | 18 |
Swell 2 Height (m) Direction Period (s) | S 9 | E 13 | E 14 | — | E 15 | — | E 13 | E 13 | E 13 | SSE 18 | SSE 17 | SSE 16 | SSE 17 | SSE 17 | S 17 | E 11 | NE 3 | S 6 | NE 4 | NE 4 | — |
| kJ | 15 | 13 | 4 | — | 4 | — | 3 | 3 | 3 | 109 | 101 | 51 | 57 | 28 | 6 | 2 | 2 | 7 | 1 | 1 | — |
Swell 3 Height (m) Direction Period (s) | E 12 | — | S 16 | — | — | — | S 19 | S 19 | S 19 | E 12 | SE 6 | ENE 3 | NE 5 | NE 5 | E 12 | S 16 | S 18 | NE 4 | E 11 | E 9 | — |
| kJ | 3 | — | 5 | — | — | — | 7 | 7 | 7 | 3 | 10 | 1 | 3 | 1 | 3 | 5 | 7 | 2 | 3 | 1 | — |
Wind waves Height (m) Direction Period (s) | SSW 4 | SSE 6 | S 9 | S 10 | S 10 | S 10 | — | — | — | — | ENE 3 | WNW 2 | — | E 2 | NW 2 | NW 3 | NNE 3 | W 2 | — | — | SSE 8 |
| kJ | 3 | 90 | 1256 | 1818 | 1725 | 2155 | — | — | — | — | 3 | 1 | — | 1 | 1 | 1 | 8 | 1 | — | — | 678 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 5 | 1261 | 118 | 658 | 658 | 79 | 5 | 40 | 0 | 0 | 6 | 0 | 2 | 6 | 0 | 7 | 0 | 109 | 140 | 118 | 86 |
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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