Surf Forecasts:
Thirroul surf forecast from 23 Jul 2026:
- Best quality surf: Friday 24 Jul, 10PM (local time) - 5.5ft (1.7m), 13s period, S swell with offshore winds.
- Most powerful swell: Friday 24 Jul, 10PM (local time) - 5.5ft (1.7m), 13s period, S swell with 1,003 kJ wave energy.
- Next surfable swell (1★+): Friday 24 Jul, 7AM (local time) - 4.5ft (1.4m), 9s 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 Friday (Jul 24) at 7AM. The primary swell is predicted to be 1.4m and 9s period with a secondary swell of 0.4m and 9s. 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 1.7m 13s and forecast to arrive on Friday (Jul 24) at 10PM. Winds are predicted to be offshore 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 (Jul 26) at 1AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Fri 24th Jul) | 4.5ft (1.4m) 9s |
| Best Surf | 10PM (Fri 24th Jul) | 5.5ft (1.7m) 13s |
| Most Powerful | 10PM (Fri 24th Jul) | 5.5ft (1.7m) 13s |
Table - best surf conditions forecast for Thirroul over the next 16 days.
The Lowdown
Alright, I’m looking at the same chart for Thirroul, and it’s a bit of a slow burner before it fires up.
The real start of the surf is Saturday the 25th. Saturday morning, we’ve got a 4ft south swell with a 11-second period and a clean offshore wind from the WNW. The energy is moderate (403) and it’ll have some punch. Saturday afternoon goes glassy, dropping to 3ft, so it’ll be smooth as silk. Sunday morning the 26th keeps it clean with 5ft from the south, 10 seconds, and a cross-off breeze. That stretch is the best of the first week.
After that, it fades. Monday the 27th is small and glassy but only 3ft, weak energy (153). Tuesday the 28th is even smaller at 2ft, and the energy drops to 74. Wednesday the 29th is a total loss – tiny, long-period slop from the SSE, 1.0ft, with a strong cross-shore wind. Not worth it.
Then a gap. Thursday the 30th has bumpy 4ft from the south, but onshore wind messes it up. Friday the 31st morning is a little gem – glassy, 4ft from the SSE, 10-second period, and solid energy (261). That’s clean.
The second week is where it gets big. From Sunday the 2nd of August, we’re looking at 12ft of south swell, but with a strong cross-shore wind and massive energy (3693). That’s expert-only, and messy. The size stays huge through Monday, Tuesday, and Wednesday, with waves between 10ft and 13ft, but the wind is mostly onshore. It’s more of a kite-surfing scene than a clean paddle-out.
The one to circle is Friday the 7th of August. That morning, we’ve got 10ft of ESE swell, a 13-second period, a light offshore wind from the NNW, and massive energy (3341). The forecast says excellent for experienced surfers. That’s the standout. The swell direction is a bit off the optimum, but with that offshore wind and long period, it’ll be powerful and well-shaped. At 10ft, this is for experts only.
Water temp is 65°F, which is a touch warmer than normal for this time of year.
So, bottom line: first week, Saturday morning the 25th through Sunday morning is your best bet. Then a lull, then a glassy Friday the 31st. Second week is big and messy until Friday the 7th of August, which is the best day of the whole outlook. The crowd at Thirroul can be there sometimes, but on a day like that, it’s worth it.
Rusty.
Short Range ForecastMostly dry. Very mild (max 19°C on Sat morning, min 6°C on Fri night). Winds decreasing (fresh winds from the WSW on Thu afternoon, calm by Sat afternoon). | Days 5-7 Weather SummaryMostly dry. Warm (max 20°C on Tue afternoon, min 9°C on Sun night). Wind will be generally light. | |||||||||||||||||||
Thu 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 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) | ENE 9 | S 9 | S 9 | SSE 12 | S 12 | S 11 | S 10 | S 11 | S 10 | S 10 | S 10 | S 9 | S 10 | S 9 | S 8 | S 8 | SSE 15 | SSE 19 | SSE 19 | S 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 73 | 348 | 276 | 205 | 855 | 381 | 206 | 302 | 416 | 260 | 183 | 139 | 117 | 79 | 52 | 33 | 44 | 71 | 36 | 285 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-on | off | off | glassy | cross-off | cross-off | cross-on | off | glassy | cross-on | off | cross-off | cross-off | cross-off | cross | cross | cross |
High Tide | 4:12AM0.87m | 4:35PM1.33m | 5:17AM0.88m | 5:25PM1.37m | 6:11AM0.91m | 6:11PM1.42m | 6:56AM0.95m | 6:53PM1.48m | 7:36AM0.99m | 7:32PM1.52m | 8:13AM1.04m | 8:08PM1.55m | ||||||||
Low Tide | 10:38PM0.47m | 9:39AM0.49m | 11:37PM0.42m | 10:35AM0.49m | 00:25AM0.36m | 11:28AM0.47m | 1:07AM0.30m | 12:15PM0.43m | 1:45AM0.24m | 12:58PM0.40m | 2:20AM0.20m | 1:39PM0.36m | 2:54AM0.16m | |||||||
 |  | | | | | | | | | | | | |  | |  | |  | | |
 | — | — | 6:56 | — | — | 6:54 | — | — | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — | 6:52 | — | — |
 | 5:08 | — | — | 5:08 | — | — | 5:09 | — | — | 5:10 | — | — | 5:10 | — | — | 5:12 | — | — | 5:13 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 10 | 14 | 13 | 9 | 19 | 19 | 13 | 17 | 17 | 11 | 16 | 16 | 12 | 19 | 20 | 14 | 13 | 12 | 13 |
Feels °C | 11 | 4 | 10 | 10 | 5 | 17 | 17 | 8 | 14 | 15 | 7 | 14 | 14 | 10 | 15 | 17 | 10 | 8 | 6 | 9 |
Swell 1 Height (m) Direction Period (s) | ENE 9 | S 9 | S 9 | S 8 | S 12 | S 11 | S 10 | S 11 | S 10 | S 10 | S 10 | S 9 | S 10 | S 9 | S 8 | S 8 | NE 5 | SSE 19 | SSE 19 | SSE 15 |
| kJ | 73 | 348 | 276 | 205 | 855 | 381 | 206 | 302 | 416 | 260 | 183 | 139 | 117 | 79 | 52 | 33 | 6 | 71 | 36 | 84 |
Swell 2 Height (m) Direction Period (s) | S 9 | ENE 9 | ENE 9 | SSE 12 | ENE 8 | ENE 9 | ENE 8 | ENE 8 | NE 8 | NE 8 | NE 8 | NE 8 | SE 15 | SE 16 | SSE 15 | SSE 17 | SSE 15 | S 10 | S 10 | E 8 |
| kJ | 14 | 45 | 29 | 186 | 14 | 15 | 7 | 7 | 3 | 2 | 2 | 2 | 8 | 10 | 21 | 28 | 44 | 7 | 9 | 1 |
Swell 3 Height (m) Direction Period (s) | SE 8 | SE 8 | S 18 | NE 8 | — | S 19 | E 9 | — | — | — | S 14 | SE 18 | NE 8 | NE 8 | E 8 | SE 14 | S 8 | NE 5 | NE 4 | E 13 |
| kJ | 3 | 2 | 7 | 18 | — | 7 | 2 | — | — | — | 4 | 12 | 2 | 3 | 1 | 8 | 11 | 1 | 1 | 3 |
Wind waves Height (m) Direction Period (s) | WSW 4 | WSW 3 | W 3 | — | WNW 3 | WNW 3 | — | W 3 | WSW 3 | — | W 3 | — | — | — | — | NE 3 | — | — | SSE 3 | S 7 |
| kJ | 10 | 3 | 1 | — | 2 | 1 | — | 5 | 2 | — | 1 | — | — | — | — | 5 | — | — | 2 | 285 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 2 | 2 | 0 | 10 | 0 | 0 | 0 | 2 | 0 | 51 | 0 | 0 | 98 | 0 | 0 | 0 | 0 | 74 | 658 | 39 |
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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