Surf Forecasts:
Thirroul surf forecast from 23 Aug 2026:
- Best quality surf: Monday 24 Aug, 10AM (local time) - 2.5ft (0.7m), 10s period, S swell with cross-offshore winds.
- Most powerful swell: Thursday 27 Aug, 4AM (local time) - 5ft (1.6m), 8s period, S swell with 367 kJ wave energy.
- Next surfable swell (1★+): Monday 24 Aug, 1AM (local time) - 3ft (0.9m), 10s 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 (Aug 24) at 1AM. The primary swell is predicted to be 0.9m and 10s period with a secondary swell of 0.2m and 9s. Another secondary swell of 0.8m and 5s is also forecast. 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 1.6m 8s and forecast to arrive on Thursday (Aug 27) at 4AM. 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 Wednesday (Aug 26) at 7AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Mon 24th Aug) | 3ft (0.9m) 10s |
| Best Surf | 10AM (Mon 24th Aug) | 2.5ft (0.7m) 10s |
| Most Powerful | 4AM (Thu 27th Aug) | 5ft (1.6m) 8s |
Table - best surf conditions forecast for Thirroul over the next 16 days.
The Lowdown
Alright, Rusty here, let’s look at what’s happening down at Thirroul. We’ll use feet, nautical miles, and Fahrenheit for the wind.
The next couple of weeks is a bit of a mix. A slow start, then a few windows where it cleans up and gets properly good. The water temp is around 64°, which is dead average for this time of year.
The first chance for a paddle is Monday morning, August 24th. Small 2ft south swell, with a light north wind giving you a clean surface. It’s surfable, but you’ll be scratching for them.
Tuesday afternoon, August 25th is the first real standout. We’ve got a 4ft NE swell (short period at 7 seconds), but a cross-off wind from the NNW will make for some punchy, clean walls. The wave energy is solid (345).
The best-looking window is Thursday morning, August 27th. A 4ft south swell with an 8-second period, and the wind is forecast to be glassy – flat calm from the SSE. Wave energy at 353. That’s a recipe for silky, clean, peelers. Get out for the dawn patrol.
We’ve got another promising long-range call for Monday, August 31st. It’s only a 2ft groundswell, but at 19 seconds from the SSE, and glassy conditions, it’ll be long, clean lines. Wave energy is 351. A quiet Monday with perfect conditions.
After a lull, Sunday, September 6th rolls in with a 3ft south swell, 11-second period, and clean offshores in the afternoon. Wave energy is 292. That Sunday arvo session looks like a fine way to wrap up the forecast window.
Keep in mind for the beginners: that Thursday 4ft is manageable, but the glassy conditions make it look better than it is for learning. The bigger stuff never really tops 4ft, so it’s all good fun. Main thing to watch is the wind – glassy or light offshore is gold, but the onshore chop will ruin it quickly. Expect a few mates in the lineup on the clean days.
Rusty.
Short Range ForecastModerate rain (total 15mm), heaviest on Tue afternoon. Warm (max 21°C on Mon morning, min 12°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 17°C on Fri morning, min 11°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Sun 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | ||||||||||||||
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 12 | S 10 | S 10 | S 10 | NE 6 | ENE 6 | NE 7 | NE 8 | ENE 8 | ENE 8 | S 8 | S 8 | S 8 | S 10 | SSE 11 | SSE 11 | SSE 10 | SSE 9 | SSE 9 | SSE 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 134 | 158 | 90 | 67 | 202 | 51 | 194 | 133 | 109 | 114 | 294 | 277 | 153 | 216 | 128 | 353 | 214 | 164 | 136 | 94 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | cross | cross-off | cross-off | cross-off | glassy | cross | cross-on | cross-on | glassy | on | cross-off | glassy | on | glassy | glassy | cross-on | off |
High Tide | 4:57PM1.32m | 5:49AM0.92m | 5:45PM1.38m | 6:31AM0.99m | 6:26PM1.45m | 7:08AM1.06m | 7:04PM1.50m | 7:42AM1.13m | 7:41PM1.53m | 8:16AM1.21m | 8:16PM1.53m | 8:51AM1.27m | 8:52PM1.50m | |||||||
Low Tide | 11:58PM0.37m | 11:07AM0.49m | 00:37AM0.30m | 11:56AM0.43m | 1:12AM0.23m | 12:39PM0.37m | 1:44AM0.17m | 1:19PM0.32m | 2:15AM0.13m | 1:59PM0.28m | 2:45AM0.11m | 2:40PM0.25m | 3:16AM0.11m | |||||||
 |  | |  |  |  |  |  | | |  | | | | |  | | | | | |
 | — | — | 6:26 | — | — | 6:24 | — | — | 6:22 | — | — | 6:22 | — | — | 6:20 | — | — | 6:20 | — | — |
 | 5:30 | — | — | 5:30 | — | — | 5:31 | — | — | 5:32 | — | — | 5:32 | — | — | 5:34 | — | — | 5:35 | — |
mm | — | — | — | — | — | 1 | 10 | 2 | 2 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 14 | 21 | 19 | 16 | 19 | 16 | 16 | 16 | 15 | 14 | 15 | 15 | 14 | 17 | 15 | 12 | 17 | 16 | 13 |
Feels °C | 14 | 12 | 17 | 16 | 16 | 16 | 15 | 17 | 15 | 12 | 12 | 14 | 14 | 14 | 15 | 14 | 10 | 15 | 14 | 12 |
Swell 1 Height (m) Direction Period (s) | SSE 7 | S 10 | NE 6 | S 10 | NE 6 | ENE 6 | ENE 7 | NE 8 | ENE 8 | ENE 8 | ENE 8 | S 8 | S 8 | S 10 | SSE 11 | SSE 11 | SSE 10 | SSE 9 | SSE 9 | SSE 9 |
| kJ | 89 | 158 | 38 | 67 | 94 | 51 | 102 | 133 | 109 | 114 | 80 | 277 | 153 | 216 | 128 | 353 | 214 | 164 | 136 | 94 |
Swell 2 Height (m) Direction Period (s) | S 12 | ENE 9 | S 10 | S 18 | S 10 | S 9 | S 9 | S 8 | S 16 | S 11 | S 15 | ENE 8 | ENE 8 | ENE 9 | S 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 9 |
| kJ | 134 | 8 | 90 | 6 | 46 | 26 | 25 | 13 | 19 | 2 | 4 | 54 | 52 | 71 | 65 | 59 | 44 | 43 | 47 | 44 |
Swell 3 Height (m) Direction Period (s) | — | S 18 | NE 9 | E 13 | — | ENE 10 | SSE 16 | SSE 16 | S 16 | — | — | SSE 15 | SSE 14 | S 14 | ENE 8 | S 9 | S 10 | S 10 | S 10 | S 10 |
| kJ | — | 6 | 3 | 3 | — | 9 | 24 | 25 | 5 | — | — | 22 | 36 | 36 | 61 | 57 | 2 | 32 | 2 | 8 |
Wind waves Height (m) Direction Period (s) | NE 6 | NE 5 | NE 6 | NE 5 | NE 6 | N 2 | NE 7 | — | S 4 | SSE 6 | S 8 | — | — | — | — | — | — | SW 3 | — | — |
| kJ | 18 | 26 | 80 | 67 | 202 | 1 | 194 | — | 16 | 112 | 294 | — | — | — | — | — | — | 1 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 10 | 0 | 0 | 52 | 0 | 0 | 0 | 0 | 2 | 27 | 5 | 0 | 94 | 0 | 0 | 11 | 0 | 0 | 40 | 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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