Surf Forecasts:
Thirroul surf forecast from 4 Aug 2026:
- Best quality surf: Monday 10 Aug, 4AM (local time) - 5ft (1.5m), 8s period, ENE swell with offshore winds.
- Most powerful swell: Monday 10 Aug, 10AM (local time) - 4.5ft (1.4m), 9s period, ENE swell with 304 kJ wave energy.
- Next surfable swell (1★+): Thursday 6 Aug, 4AM (local time) - 1.5ft (0.4m), 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 Thursday (Aug 06) at 4AM. The primary swell is predicted to be 0.4m and 8s period with a secondary swell of 0.3m 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 1.4m 9s and forecast to arrive on Monday (Aug 10) at 10AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Monday (Aug 10) at 4AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Thu 6th Aug) | 1.5ft (0.4m) 8s |
| Best Surf | 4AM (Mon 10th Aug) | 5ft (1.5m) 8s |
| Most Powerful | 10AM (Mon 10th Aug) | 4.5ft (1.4m) 9s |
Table - best surf conditions forecast for Thirroul over the next 16 days.
The Lowdown
Alright, Rusty here. Let's talk about what's cookin' for Thirroul over the next couple of weeks.
Look, I gotta be straight with you – the first week is a bit of a slow burn. We're looking at a real lean spell for a few days. It's not until next Monday, the 10th of August, that we finally see a pulse of proper swell. Before that, you're mostly looking at small, weak dribble. The combined swell energy is barely hitting triple digits until the 6th, and even then, it's offering up messy, ordinary conditions. The 8th of August, Saturday morning, is clean and glassy, but the swell is tiny at 0.5 feet – you'd be on a foamie for that.
The standout window is shaping up for Monday the 10th. We get a solid ENE pulse, pushing 5 feet on the morning with a clean 9-second period. The combined energy jumps to a solid 309 (moderate), and the wind is a clean offshore from the WNW. That's a recipe for some fun, lined-up waves all morning and into the afternoon. It's a beach and reef setup, so it can handle a bit of juice, and with the offshore wind, it'll be clean. Keep in mind it can get a crowd here sometimes, so get in early.
Then, hold onto your board, because Friday the 14th of August is looking like the real gem. The morning is pure glass – zero wind, a glassy surface. The swell picks up to 5 feet of S groundswell, with a period of 11 seconds. The combined energy is a thumping 557 (strong). This is a bigger session, pushing into that "experts only" territory if it gets a bit more punchy. The long period from the south means it'll be breaking with some serious power and shape, perfect for the reef sections. It's a true standout, but it's over a week away, so keep an eye on the forecasts.
The weekend of the 16th also has a little promise. Sunday morning the 16th offers glassy conditions with 4 feet of S swell and a 10-second period, and the energy is still a solid 264. It'll be a decent session, but not quite the bang of that Friday the 14th.
After that, the swell dips back down into the small stuff. So, to sum it up: the first week is a write-off, but the 10th brings a solid session, and the 14th of August is the one to circle on your calendar for a proper, powerful, glassy morning.
Rusty.
Short Range ForecastMostly dry. Very mild (max 18°C on Wed afternoon, min 7°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 19°C on Sun afternoon, min 8°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | |||||||||||||||
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) | SSE 10 | SSE 10 | ESE 8 | E 10 | E 9 | SSE 10 | S 8 | S 8 | S 9 | SSE 10 | S 9 | SSE 9 | S 8 | SSE 8 | SSE 8 | E 8 | NE 5 | NE 7 | ENE 9 | ENE 9 | ENE 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 10 | 10 | 7 | 18 | 15 | 31 | 90 | 127 | 76 | 68 | 58 | 47 | 45 | 40 | 38 | 32 | 33 | 273 | 304 | 211 | 108 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | off | cross-off | cross-on | cross-off | glassy | cross-on | off | cross-off | cross | off | off | off | off |
High Tide | 12:03PM1.29m | 00:01AM1.20m | 12:53PM1.32m | 1:01AM1.09m | 1:52PM1.36m | 2:15AM1.00m | 2:58PM1.41m | 3:39AM0.97m | 4:05PM1.49m | 4:58AM0.98m | 5:10PM1.58m | 6:05AM1.04m | 6:08PM1.67m | ||||||||
Low Tide | 6:07PM0.41m | 6:19AM0.25m | 7:13PM0.42m | 7:08AM0.31m | 8:30PM0.40m | 8:07AM0.36m | 9:51PM0.34m | 9:16AM0.39m | 11:05PM0.25m | 10:26AM0.38m | 00:08AM0.14m | 11:31AM0.33m | 1:02AM0.05m | ||||||||
 | |  |  | | | |  | | | |  | | | | | | | | | | |
 | 6:47 | — | — | 6:46 | — | — | 6:46 | — | — | 6:45 | — | — | 6:43 | — | — | 6:43 | — | — | 6:41 | — | — |
 | — | 5:16 | — | — | 5:17 | — | — | 5:17 | — | — | 5:19 | — | — | 5:20 | — | — | 5:21 | — | — | 5:21 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 17 | 10 | 17 | 18 | 12 | 17 | 16 | 11 | 15 | 15 | 12 | 15 | 15 | 12 | 18 | 19 | 18 | 16 | 14 | 14 |
Feels °C | 11 | 11 | 4 | 13 | 13 | 6 | 14 | 12 | 7 | 11 | 11 | 10 | 12 | 13 | 10 | 14 | 14 | 12 | 10 | 8 | 10 |
Swell 1 Height (m) Direction Period (s) | SSE 10 | S 5 | S 5 | E 10 | E 9 | SSE 10 | S 8 | S 8 | S 9 | S 8 | S 9 | SSE 9 | S 8 | SSE 8 | SSE 8 | E 8 | E 8 | E 14 | ENE 9 | ENE 9 | ENE 9 |
| kJ | 10 | 4 | 2 | 18 | 15 | 31 | 90 | 127 | 76 | 68 | 55 | 47 | 43 | 40 | 38 | 32 | 31 | 4 | 304 | 211 | 108 |
Swell 2 Height (m) Direction Period (s) | ESE 7 | SSE 10 | ESE 8 | E 7 | S 10 | E 8 | E 9 | E 9 | SSE 10 | SSE 10 | SSE 9 | S 8 | SSE 9 | S 7 | E 8 | SSE 8 | SSE 7 | S 7 | S 9 | SE 13 | — |
| kJ | 5 | 10 | 7 | 4 | 9 | 6 | 6 | 6 | 39 | 61 | 58 | 31 | 45 | 24 | 18 | 20 | 10 | 1 | 2 | 6 | — |
Swell 3 Height (m) Direction Period (s) | NE 5 | ESE 7 | SE 11 | SE 12 | S 4 | S 5 | E 12 | E 12 | E 10 | E 9 | ENE 10 | ENE 7 | ENE 7 | ENE 8 | ENE 6 | E 14 | ENE 10 | SE 10 | S 13 | — | SE 12 |
| kJ | 1 | 5 | 5 | 6 | 1 | 2 | 3 | 3 | 17 | 14 | 19 | 9 | 10 | 19 | 4 | 4 | 10 | 4 | 3 | — | 6 |
Wind waves Height (m) Direction Period (s) | WSW 3 | WSW 3 | W 3 | WSW 3 | — | WSW 3 | W 3 | — | W 2 | W 3 | — | — | WSW 2 | — | — | NNE 2 | NE 5 | NE 7 | W 3 | W 3 | WNW 2 |
| kJ | 6 | 3 | 5 | 3 | — | 6 | 1 | — | 1 | 1 | — | — | 1 | — | — | 1 | 33 | 273 | 8 | 5 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 71 | 175 | 71 | 7 | 38 | 7 | 0 | 21 | 0 | 0 | 130 | 0 | 0 | 166 | 0 | 0 | 94 | 7 | 0 | 0 | 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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