Surf Forecasts:
Thirroul surf forecast from 9 Sep 2026:
- Best quality surf: Thursday 10 Sep, 10PM (local time) - 6ft (1.8m), 10s period, SSE swell with cross-offshore winds.
- Most powerful swell: Wednesday 9 Sep, 10PM (local time) - 11ft (3.5m), 10s period, SSE swell with 2,561 kJ wave energy.
- Next surfable swell (1★+): Thursday 10 Sep, 10PM (local time) - 6ft (1.8m), 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 10) at 10PM. The primary swell is predicted to be 1.8m and 10s period with a secondary swell of 0.2m and 9s. 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-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 5s period and expected on Sunday (Sep 13) at 10PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Thu 10th Sep) | 6ft (1.8m) 10s |
| Best Surf | 10PM (Thu 10th Sep) | 6ft (1.8m) 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, Rusty here, looking at the charts for our local patch. Let's see what we've got.
Honestly, for the next week and a half, it's a bit of a struggle. We're looking at a long stretch of messy, choppy conditions with very little in the way of quality surf. The water is sitting at 64° which is about average for this time of year. The first real glimmer of hope doesn't show up until Saturday the 19th.
The standout window is that Saturday morning, the 19th of September. We've got a clean, 4ft swell from the south with a light cross-offshore breeze from the NNW. The combined energy is moderate (251). It’s not going to be huge, but the conditions will be right. After two weeks of nothing, this is the one to circle. The only downside is that crowds at Thirroul are sometimes an issue, so get in early.
Before that, the 14th of September, Monday morning, actually has some clean conditions with a light cross-offshore wind, but the swell is tiny at 2ft (126). It's surfable, but you'll be working hard for little reward. The 17th of September, Thursday morning, is similar—clean again with a cross-offshore breeze, but the swell is only 3ft (179). It's very ordinary.
The rest of the period is a write-off. You’ve got strong onshore winds and lumpy, 8ft walls of close-out slop on the 10th, and a lot of weak, choppy days in between. The period from the 10th to the 18th is a real dead zone.
So, to sum it up: sit tight, wait for Saturday the 19th. That’s your best bet. Everything else is just looking at the ocean and wishing.
Rusty.
Short Range ForecastMostly dry. Very mild (max 17°C on Wed morning, min 9°C on Wed night). Winds decreasing (fresh winds from the S on Wed afternoon, calm by Fri afternoon). | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Mon morning, min 13°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | |||||||||||||||
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) | S 8 | S 8 | S 10 | S 10 | SSE 9 | SSE 10 | SSE 9 | SSE 9 | SSE 9 | SSE 11 | SSE 10 | SSE 9 | S 9 | S 10 | S 10 | S 11 | S 10 | NE 6 | S 9 | SSE 7 | SSE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 84 | 923 | 2037 | 1129 | 572 | 614 | 409 | 360 | 225 | 268 | 170 | 92 | 56 | 102 | 102 | 83 | 80 | 56 | 85 | 163 | 284 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross | cross | cross-on | cross-off | cross-on | on | off | cross | cross-on | cross-off | cross | cross | off | cross-off | cross | off | cross-on | cross-on | cross-on |
High Tide | 6:46PM1.62m | 7:28AM1.27m | 7:32PM1.61m | 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 | ||||||||
Low Tide | 12:24PM0.27m | 1:23AM0.03m | 1:15PM0.21m | 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 | ||||||||
 | |  | |  | | | |  | | | | | | | | | |  | |  | |
 | 6:05 | — | — | 6:03 | — | — | 6:01 | — | — | 6:01 | — | — | 5:58 | — | — | 5:58 | — | — | 5:56 | — | — |
 | — | 5:42 | — | — | 5:43 | — | — | 5:44 | — | — | 5:45 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 14 | 13 | 15 | 15 | 12 | 17 | 16 | 13 | 20 | 18 | 14 | 21 | 19 | 16 | 26 | 25 | 19 | 16 | 14 | 14 |
Feels °C | 13 | 6 | 5 | 10 | 11 | 10 | 14 | 14 | 13 | 16 | 14 | 13 | 17 | 16 | 16 | 23 | 23 | 18 | 13 | 11 | 12 |
Swell 1 Height (m) Direction Period (s) | S 8 | ESE 13 | ESE 11 | S 10 | SSE 22 | SSE 10 | SSE 9 | SSE 9 | SSE 9 | SSE 11 | SSE 10 | SSE 9 | S 9 | S 10 | NE 6 | S 11 | S 10 | NE 6 | NE 6 | NE 6 | SSE 8 |
| kJ | 84 | 17 | 41 | 813 | 164 | 614 | 409 | 360 | 225 | 268 | 170 | 92 | 56 | 102 | 32 | 83 | 80 | 56 | 33 | 13 | 284 |
Swell 2 Height (m) Direction Period (s) | SE 7 | E 16 | S 24 | ESE 10 | ESE 9 | ESE 8 | E 15 | E 14 | SSE 18 | SSE 19 | SSE 19 | NE 4 | SSE 11 | ENE 13 | S 10 | NE 6 | ENE 13 | S 10 | E 12 | E 13 | NE 6 |
| kJ | 42 | 5 | 11 | 19 | 17 | 6 | 4 | 4 | 32 | 69 | 74 | 9 | 40 | 17 | 102 | 30 | 16 | 49 | 12 | 13 | 5 |
Swell 3 Height (m) Direction Period (s) | E 9 | E 16 | S 16 | SSE 23 | E 16 | S 21 | E 10 | E 10 | E 13 | E 14 | ENE 14 | SSE 18 | ENE 13 | E 9 | ENE 13 | E 13 | — | ENE 12 | — | ENE 13 | E 13 |
| kJ | 7 | 5 | 20 | 102 | 5 | 36 | 2 | 2 | 14 | 15 | 19 | 66 | 17 | 2 | 17 | 13 | — | 15 | — | 16 | 14 |
Wind waves Height (m) Direction Period (s) | SSW 4 | S 8 | S 10 | S 10 | SSE 9 | — | — | — | — | — | E 3 | NNW 2 | NE 4 | NE 5 | NE 6 | — | NE 5 | — | S 9 | SSE 7 | — |
| kJ | 13 | 923 | 2037 | 1129 | 572 | — | — | — | — | — | 5 | 1 | 7 | 45 | 83 | — | 57 | — | 85 | 163 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 36 | 821 | 5 | 36 | 48 | 0 | 5 | 79 | 0 | 2 | 94 | 0 | 6 | 436 | 0 | 0 | 6 | 0 | 262 | 39 | 5 |
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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