Surf Forecasts:
Thirroul surf forecast from 29 Aug 2026:
- Best quality surf: Saturday 29 Aug, 10PM (local time) - 3ft (0.9m), 9s period, SSE swell with glassy winds.
- Most powerful swell: Tuesday 1 Sep, 4AM (local time) - 3ft (0.9m), 10s period, S swell with 161 kJ wave energy.
- Next surfable swell (1★+): Saturday 29 Aug, 10PM (local time) - 3ft (0.9m), 9s 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 Saturday (Aug 29) at 10PM. The primary swell is predicted to be 0.9m and 9s period with a secondary swell of 0.7m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Thirroul in the next 16 days are 0.9m 10s and forecast to arrive on Tuesday (Sep 01) at 4AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Saturday (Sep 05) at 1PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Sat 29th Aug) | 3ft (0.9m) 9s |
| Best Surf | 10PM (Sat 29th Aug) | 3ft (0.9m) 9s |
| Most Powerful | 4AM (Tue 1st Sep) | 3ft (0.9m) 10s |
Table - best surf conditions forecast for Thirroul over the next 16 days.
The Lowdown
Alright, let’s take a look at what’s comin’ up for the next couple of weeks here at Thirroul. This is a beach and reef setup that picks up a solid SE swell, and the water’s sittin’ right around 64°F, which is bang on average for this time of year – nothing unusual there.
We’ve got a bit of a slow start, but the first real standout is Sunday morning, the 30th of August. It’s glassy, no wind at all, with a clean 3ft southerly swell rollin’ in at 9 seconds. That’s gonna be your best window early on – really clean, really cruisy. The combined energy is moderate at 252.
After that, the surf gets smaller and more ordinary for a few days. Monday the 31st has a glassy 3ft, but it’s short period and weak, so not much push. Tuesday morning the 1st of September has a little more period at 11 seconds and cross-off wind, but the swell’s only 3ft. It’s surfable but nothin’ to get excited about.
Then we hit a real flat spell from about Wednesday the 2nd through to the next week. The combined energy drops right down to around 47 to 137, and the swell is tiny – under 2ft – with short periods. There’s a few days in there with clean offshore winds, but no wave height to work with. It’s a solid gap of about 5 to 6 days with no real surf on offer.
Now, here’s where it gets interesting. On Wednesday the 9th of September, we get a big spike in the morning – 12ft southerly swell at 11 seconds, with combined energy through the roof at 4100. That’s a serious pulse, but the wind is cross-onshore and choppy, and the tide could be an issue. This is expert-only territory, and the conditions are messy, so it’s more of a big-wave challenge than a clean session. Thursday the 10th still has solid 6ft swell but the wind is sideshore, not great.
The best late-period option looks like Friday the 11th of September morning. The swell drops to 4ft from the south, period at 10 seconds, and the wind is light cross-off from the NW – that’s clean. Combined energy is moderate at 274. It’s not huge, but it’s the cleanest window in the second week and worth a paddle.
All in all, the standout is Sunday morning the 30th of August for clean, glassy fun waves. Beyond that, Friday the 11th morning is your next best bet. Don’t hold your breath for the middle of the week – it goes flat for a while.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Tue morning, min 11°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Wed morning, min 13°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Sat 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | ||||||||||||||
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) | SE 10 | SE 10 | S 9 | SSE 9 | S 9 | S 8 | S 9 | S 9 | S 11 | S 10 | S 10 | S 10 | S 10 | SSE 10 | ENE 10 | SSE 11 | SSE 10 | S 10 | S 12 | S 10 |
Wave Graph | ||||||||||||||||||||
216 | 131 | 155 | 132 | 133 | 108 | 106 | 136 | 146 | 141 | 98 | 71 | 50 | 31 | 19 | 38 | 19 | 45 | 72 | 74 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | off | glassy | on | off | glassy | cross-on | cross-off | cross-off | cross-off | cross-off | off | cross-off | off | off | cross-off | cross-off | glassy | cross-on | cross-off |
High Tide | 8:52PM1.50m | 9:26AM1.33m | 9:30PM1.43m | 10:03AM1.38m | 10:11PM1.34m | 10:43AM1.41m | 10:56PM1.23m | 11:28AM1.41m | 11:50PM1.11m | 12:22PM1.41m | 00:56AM1.01m | 1:27PM1.40m | 2:19AM0.94m | |||||||
Low Tide | 3:16AM0.11m | 3:22PM0.25m | 3:48AM0.13m | 4:08PM0.25m | 4:22AM0.18m | 4:58PM0.28m | 5:01AM0.25m | 5:55PM0.31m | 5:45AM0.32m | 7:04PM0.34m | 6:40AM0.40m | 8:25PM0.34m | ||||||||
— | — | 6:18 | — | — | 6:16 | — | — | 6:16 | — | — | 6:13 | — | — | 6:13 | — | — | 6:11 | — | — | |
5:35 | — | — | 5:35 | — | — | 5:36 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:38 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 12 | 18 | 16 | 13 | 21 | 18 | 14 | 25 | 24 | 17 | 27 | 27 | 19 | 24 | 23 | 16 | 21 | 20 | 16 |
Feels °C | 14 | 11 | 16 | 14 | 13 | 18 | 16 | 14 | 20 | 20 | 14 | 23 | 24 | 16 | 19 | 18 | 11 | 19 | 17 | 14 |
Swell 1 Height (m) Direction Period (s) | SE 10 | SE 10 | S 9 | SSE 9 | S 9 | S 8 | S 9 | S 9 | S 11 | S 10 | S 10 | S 10 | S 10 | SSE 10 | S 7 | SSE 11 | SSE 10 | S 10 | S 12 | S 10 |
216 | 131 | 155 | 132 | 133 | 108 | 106 | 136 | 146 | 141 | 98 | 71 | 50 | 31 | 14 | 38 | 19 | 45 | 72 | 74 | |
Swell 2 Height (m) Direction Period (s) | S 8 | S 9 | SE 9 | ENE 9 | SSE 17 | SSE 15 | ENE 9 | NE 4 | ENE 9 | NE 5 | ENE 6 | NE 6 | NE 6 | ENE 10 | S 9 | SSW 7 | S 5 | SSE 12 | SSE 15 | NE 4 |
84 | 76 | 71 | 25 | 99 | 44 | 16 | 2 | 15 | 19 | 22 | 16 | 8 | 19 | 14 | 15 | 5 | 28 | 44 | 7 | |
Swell 3 Height (m) Direction Period (s) | ENE 8 | ENE 9 | ENE 9 | SE 9 | ENE 8 | ENE 9 | SSE 16 | ENE 9 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | NE 5 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | S 7 |
24 | 26 | 26 | 20 | 14 | 17 | 25 | 16 | 13 | 22 | 20 | 20 | 20 | 4 | 19 | 19 | 19 | 19 | 19 | 8 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | ENE 3 | NNE 4 | NE 4 | NE 5 | NNW 2 | — | — | — | W 3 | — | WSW 3 | — | ENE 3 | — |
— | — | — | — | — | — | 3 | 10 | 4 | 77 | 1 | — | — | — | 1 | — | 2 | — | 2 | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 36 | 0 | 0 | 40 | 0 | 0 | 51 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5 | 5 | 0 | 51 | 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.











