Surf Forecasts:
Thirroul surf forecast from 6 Sep 2026:
- Best quality surf: Thursday 10 Sep, 4AM (local time) - 8ft (2.5m), 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 2,251 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 1AM (local time) - 5.5ft (1.7m), 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 1.7m 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-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Sunday (Sep 13) at 10AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Mon 7th Sep) | 5.5ft (1.7m) 8s |
| Best Surf | 4AM (Thu 10th Sep) | 8ft (2.5m) 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 folks, Rusty here. Let’s have a look at what’s on the cards for Thirroul over the next couple of weeks.
Straight up, the first few days are a bit of a write-off. Sunday the 6th is a no-go with poor surf conditions and a weak, messy 3ft SSW swell with a short period of 6 seconds and combined energy of only 88. The wind is all over the shop. We’ve got a bit of a wait on our hands.
Things start to look up on Monday morning the 7th. We score a clean 4ft SSE swell with a light NNW cross-offshore wind. The energy is moderate at 289, and it’s a decent enough start to the week. It’s not the biggest, but it’s clean and that’s a win.
Tuesday the 8th morning sees a bump in size to 8ft from the south, with a period of 9 seconds and strong energy at 1517. The wind is cross-shore, so it’s a bit lumpy. It’s more of a challenge, but there’s power there. The afternoon drops to 7ft but gets a cross-onshore wind, making it choppy.
The real standout, the one you’ve been waiting for, is Friday the 18th. That morning, we’ve got a solid 16ft south swell rolling in with a period of 12 seconds – that’s proper groundswell energy. The combined energy is a massive 11255, so it’s powerful. The wind is a clean cross-offshore from the NNW. This is big, heavy, and only for experienced surfers. The afternoon cleans up even more with a moderate offshore wind from the NW, dropping to 13ft but still with energy at 4213. It’s excellent but only for the skilled crew.
Before that, we have a great window on Friday the 11th and Saturday the 12th. Friday morning brings a 7ft SSE swell with glassy conditions – absolutely clean. The energy is 806. Saturday morning is similar, with a 6ft SSE swell and glassy again. These are your best bets for cleaner, more manageable waves.
The second week has a couple of nice moments. Sunday the 20th morning has a clean 6ft SSE swell with a long period of 13 seconds and a cross-offshore wind, feeling very good. But the big swell on the 18th is the clear winner. Heavy, powerful, and clean – that’s the one to circle.
Water temp is sitting at 64°F, which is about average for the time of year, nothing unusual there. Crowds at Thirroul can be an issue, especially on the cleaner days, so get in early.
Rusty.
Short Range ForecastMostly dry. Warm (max 20°C on Sun morning, min 10°C on Tue night). Winds increasing (light winds from the WNW on Sun night, fresh winds from the S by Mon night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 17°C on Fri morning, min 8°C on Wed night). Winds decreasing (fresh winds from the S on Wed morning, calm by Fri morning). | ||||||||||||||||||||
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 10 | S 9 | S 9 | SSE 10 | SSE 9 | SSE 8 | SSE 8 | S 10 | S 10 | S 10 | S 10 | SSE 10 | SSE 10 | S 10 | SSE 11 | SSE 10 | SSE 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 57 | 660 | 403 | 229 | 204 | 1520 | 868 | 717 | 343 | 202 | 1055 | 1877 | 1586 | 1649 | 1570 | 800 | 787 | 1109 | 698 | 482 | 295 |
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 | cross-on | off | cross | cross-on | cross | cross | cross-on | cross-off | glassy | on | cross-off | glassy | cross-on | 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 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 20 | 18 | 14 | 20 | 18 | 15 | 16 | 16 | 12 | 15 | 14 | 13 | 15 | 15 | 12 | 17 | 16 | 12 | 17 | 16 | 11 |
Feels °C | 16 | 14 | 12 | 17 | 15 | 10 | 13 | 13 | 9 | 10 | 7 | 7 | 9 | 10 | 9 | 15 | 13 | 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 8 | ESE 13 | ESE 11 | S 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | S 10 | SSE 11 | SSE 10 | SSE 10 |
| kJ | 18 | 7 | 403 | 229 | 142 | 9 | 647 | 717 | 343 | 202 | 17 | 42 | 1138 | 1065 | 1086 | 800 | 787 | 799 | 698 | 482 | 295 |
Swell 2 Height (m) Direction Period (s) | E 11 | E 11 | E 10 | SSE 10 | E 10 | — | E 11 | E 10 | E 10 | E 10 | E 9 | E 16 | ESE 10 | ESE 10 | ESE 9 | E 15 | E 14 | E 13 | E 14 | ENE 14 | SSE 18 |
| kJ | 9 | 9 | 8 | 58 | 8 | — | 2 | 2 | 2 | 2 | 2 | 5 | 34 | 18 | 8 | 4 | 4 | 14 | 15 | 19 | 32 |
Swell 3 Height (m) Direction Period (s) | S 15 | — | NE 6 | NE 8 | NE 8 | — | — | — | N 9 | E 15 | S 16 | — | S 23 | SSE 22 | S 22 | E 10 | E 10 | E 9 | E 9 | E 10 | ENE 14 |
| kJ | 4 | — | 2 | 2 | 2 | — | — | — | 2 | 4 | 5 | — | 41 | 48 | 40 | 2 | 2 | 2 | 2 | 2 | 19 |
Wind waves Height (m) Direction Period (s) | SSW 6 | S 10 | — | — | SE 10 | S 9 | S 9 | — | NNW 2 | SSW 4 | SSE 8 | S 10 | S 10 | S 10 | S 10 | — | — | S 10 | — | — | — |
| kJ | 57 | 660 | — | — | 204 | 1520 | 868 | — | 1 | 11 | 1055 | 1877 | 1586 | 1649 | 1570 | — | — | 1109 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 5 | 690 | 0 | 0 | 316 | 118 | 27 | 79 | 0 | 79 | 881 | 5 | 39 | 131 | 0 | 0 | 86 | 0 | 0 | 94 | 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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