Surf Forecasts:
Thirroul surf forecast from 25 Aug 2026:
- Best quality surf: Thursday 27 Aug, 4AM (local time) - 6.5ft (2.0m), 8s period, S swell with glassy winds.
- Most powerful swell: Saturday 29 Aug, 4AM (local time) - 8ft (2.4m), 9s period, SSE swell with 940 kJ wave energy.
- Next surfable swell (1★+): Tuesday 25 Aug, 4PM (local time) - 5ft (1.6m), 7s period with NE 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 Tuesday (Aug 25) at 4PM. The primary swell is predicted to be 1.6m and 7s period with a secondary swell of 1.1m and 7s. Another secondary swell of 0.3m and 9s 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 2.4m 9s and forecast to arrive on Saturday (Aug 29) 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 0.3m 2s period and expected on Tuesday (Sep 01) at 1AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4PM (Tue 25th Aug) | 5ft (1.6m) 7s |
| Best Surf | 4AM (Thu 27th Aug) | 6.5ft (2.0m) 8s |
| Most Powerful | 4AM (Sat 29th Aug) | 8ft (2.4m) 9s |
Table - best surf conditions forecast for Thirroul over the next 16 days.
The Lowdown
G’day, it’s Rusty. Let’s take a look at what’s shaping up for Thirroul over the next couple of weeks. There’s some real gems early on, then it goes flat and messy, with a faint hope near the end.
We start Tuesday the 25th with some surf – about 4ft from the NE, but the period is short at 6 seconds, so it’s weak and wonky. Combined energy is 255 (weak) and the water temp is 64°, right about average for the season. Wednesday the 26th is no good – cross-shore and onshore winds mess it up.
Thursday the 27th morning is the one. Glassy flat calm, and a solid 6ft south swell rolling in with a 9-second period. Energy jumps to 528 (moderate to strong). That’s the goods – clean, decent size, and proper energy. Definitely a standout. The afternoon turns onshore and iffy, so hit it early.
Friday the 28th morning is another standout. Clean offshore breeze from the SW, 5ft of SSE groundswell with a long 11-second period. Energy is 630 (strong). That direction (SSE) matches the sweet spot for Thirroul (SE), so the banks will be working. Another top call.
Saturday the 29th morning is glassy again, but the swell drops to 4ft with a shorter 8-second period. Still fun, just not as powerful.
Then we hit a long dry patch. From Sunday the 30th afternoon through Friday the 4th of September, it’s onshore winds, chop, and weak or messy surf. A proper lull. There’s a chance Monday the 31st morning with clean 2ft SSE groundswell and a very long 17-second period, but it’s tiny – longboard only.
The blank run stretches over a week until a possible return around Tuesday the 8th of September. That morning goes glassy with 2ft of south swell and a long 12-second period – small but clean. Wednesday the 9th morning brings a bit more size – 5ft from the SSE with a short 7-second period – but clean offshore wind. Worth a peek, but it’s far out and uncertain.
Best bets: Thursday the 27th and Friday the 28th mornings. Clean, good energy, right direction. Don’t miss them. After that, it’s a waiting game.
Rusty
Short Range ForecastModerate rain (total 11mm), heaviest on Tue night. Very mild (max 18°C on Tue morning, min 10°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 17°C on Sat morning, min 10°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | |||||||||||||||
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) | NE 6 | NE 7 | NE 8 | ENE 8 | S 6 | S 8 | S 9 | S 9 | SSE 12 | SSE 11 | SSE 10 | SSE 9 | SSE 8 | S 10 | S 9 | S 9 | SSE 19 | SSE 19 | SSE 17 | S 12 | SSE 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 145 | 277 | 136 | 76 | 190 | 529 | 463 | 269 | 125 | 511 | 394 | 348 | 223 | 192 | 155 | 372 | 199 | 495 | 164 | 289 | 236 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | cross | cross-on | cross | glassy | on | off | cross-off | cross-on | cross | glassy | cross-on | off | cross-on | cross-on | off | cross-off | cross | cross-off |
High Tide | 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 | 9:26AM1.33m | 9:30PM1.43m | 10:03AM1.38m | 10:11PM1.34m | ||||||||
Low Tide | 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 | 3:22PM0.25m | 3:48AM0.13m | 4:08PM0.25m | ||||||||
 | |  |  |  |  | |  |  | | |  | | | | | | | | | | |
 | 6:24 | — | — | 6:22 | — | — | 6:22 | — | — | 6:20 | — | — | 6:20 | — | — | 6:18 | — | — | 6:16 | — | — |
 | — | 5:31 | — | — | 5:32 | — | — | 5:32 | — | — | 5:34 | — | — | 5:35 | — | — | 5:35 | — | — | 5:36 | — |
mm | 1 | 2 | 6 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 18 | 17 | 15 | 16 | 16 | 14 | 15 | 15 | 12 | 16 | 16 | 14 | 17 | 16 | 12 | 16 | 15 | 12 | 19 | 18 | 14 |
Feels °C | 16 | 16 | 15 | 13 | 12 | 12 | 15 | 13 | 10 | 12 | 13 | 11 | 15 | 14 | 11 | 13 | 12 | 11 | 16 | 14 | 13 |
Swell 1 Height (m) Direction Period (s) | ENE 6 | NE 7 | NE 8 | ENE 8 | ENE 8 | SSE 8 | S 9 | S 9 | S 8 | SSE 11 | SSE 10 | SSE 9 | SSE 8 | S 10 | S 9 | S 9 | SSE 8 | S 8 | SSE 9 | S 12 | SSE 12 |
| kJ | 74 | 140 | 136 | 76 | 82 | 324 | 463 | 269 | 100 | 511 | 394 | 348 | 223 | 192 | 155 | 372 | 171 | 121 | 101 | 289 | 236 |
Swell 2 Height (m) Direction Period (s) | S 9 | S 9 | S 9 | S 11 | S 11 | NE 8 | ENE 8 | ENE 8 | SSE 12 | ENE 8 | ENE 8 | ENE 8 | SSE 10 | SE 10 | SE 10 | NE 9 | SSE 19 | SSE 19 | SSE 17 | ENE 9 | NE 4 |
| kJ | 27 | 15 | 6 | 9 | 2 | 65 | 43 | 41 | 125 | 28 | 26 | 24 | 168 | 151 | 142 | 20 | 199 | 495 | 164 | 16 | 6 |
Swell 3 Height (m) Direction Period (s) | ENE 9 | SSE 16 | SSE 16 | S 16 | — | S 15 | SSE 15 | SSE 14 | ENE 9 | S 14 | SSW 11 | — | NE 9 | ENE 9 | ENE 9 | S 19 | ENE 9 | ENE 10 | S 11 | S 15 | ENE 9 |
| kJ | 9 | 25 | 25 | 5 | — | 4 | 22 | 38 | 31 | 91 | 22 | — | 19 | 29 | 31 | 7 | 16 | 18 | 66 | 17 | 16 |
Wind waves Height (m) Direction Period (s) | NE 6 | NE 7 | — | S 4 | S 6 | S 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | ENE 3 | NNW 2 |
| kJ | 145 | 277 | — | 25 | 190 | 529 | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 11 | 48 | 5 | 0 | 36 | 0 | 0 | 39 | 2 | 0 | 51 | 0 | 5 | 5 | 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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