Surf Forecasts:
Thirroul surf forecast from 20 Jul 2026:
- Best quality surf: Friday 24 Jul, 7PM (local time) - 4ft (1.2m), 11s period, S swell with offshore winds.
- Most powerful swell: Saturday 25 Jul, 1AM (local time) - 5ft (1.5m), 13s period, S swell with 787 kJ wave energy.
- Next surfable swell (1★+): Tuesday 21 Jul, 1AM (local time) - 4.5ft (1.4m), 10s period with ENE 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 (Jul 21) at 1AM. The primary swell is predicted to be 1.4m and 10s period with a secondary swell of 0.5m and 11s. 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 1.5m 13s and forecast to arrive on Saturday (Jul 25) at 1AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Thursday (Jul 23) at 7PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Tue 21st Jul) | 4.5ft (1.4m) 10s |
| Best Surf | 7PM (Fri 24th Jul) | 4ft (1.2m) 11s |
| Most Powerful | 1AM (Sat 25th Jul) | 5ft (1.5m) 13s |
Table - best surf conditions forecast for Thirroul over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s break down the next few weeks at Thirroul. It’s a slow start, but the end of the month and early August have some real teeth.
The water’s sitting at about 65°, which is a degree warmer than usual for this time of year – nice little bonus.
Monday the 20th kicks off with a 5ft swell from the ENE, but cross-shore wind and moderate energy (690) make it a write-off. Tuesday the 21st morning is cleaner with a lighter wind and 4ft ENE swell, but nothing special. The real standout is Thursday the 30th of July morning. That’s a 6ft south swell with a 13-second period – long-period groundswell – and serious energy (1192). The wind is a clean cross-off from the NW, perfect for experienced surfers. The south direction matches up well with the spot’s optimal SE direction. Thursday afternoon holds up too, with 6ft and offshore winds.
Sunday the 2nd of August afternoon has a 3ft SSE swell with a 12-second period and offshore WNW wind – clean. Monday the 3rd of August morning brings a 6ft south swell, but the period is short at 8 seconds. The big one is Tuesday the 4th of August morning: a massive 10ft south swell with an 11-second period and glassy calm wind. The energy is off the charts (3755). That’s experts only, but it’s a dream.
The pick is Thursday the 30th of July morning, with Tuesday the 4th of August morning for the big-wave crew. The rest of the period is mostly small or messy.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Wed morning, min 10°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 18°C on Sat morning, min 6°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | ||||||||||||||
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 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | S 8 | S 9 | S 10 | S 13 | S 11 | S 11 | S 12 | S 11 | S 10 | S 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 572 | 419 | 331 | 286 | 218 | 179 | 175 | 103 | 73 | 73 | 203 | 351 | 290 | 787 | 358 | 244 | 324 | 332 | 239 | 198 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | cross | off | off | glassy | off | cross-off | cross-off | cross-off | cross-off | cross-on | off | cross-off | cross-off | cross-off | cross-off | glassy | cross-off |
High Tide | 00:57AM1.14m | 1:53PM1.27m | 1:54AM1.01m | 2:46PM1.28m | 3:00AM0.92m | 3:41PM1.30m | 4:12AM0.87m | 4:35PM1.33m | 5:17AM0.88m | 5:25PM1.37m | 6:11AM0.91m | 6:11PM1.42m | ||||||||
Low Tide | 7:05PM0.46m | 7:14AM0.31m | 8:15PM0.49m | 7:57AM0.39m | 9:28PM0.50m | 8:45AM0.45m | 10:38PM0.47m | 9:39AM0.49m | 11:37PM0.42m | 10:35AM0.49m | 00:25AM0.36m | 11:28AM0.47m | 1:07AM0.30m | |||||||
 |  | | |  |  | | | | | | | | | | | | | | | |
 | — | — | 6:56 | — | — | 6:56 | — | — | 6:56 | — | — | 6:56 | — | — | 6:54 | — | — | 6:54 | — | — |
 | 5:07 | — | — | 5:07 | — | — | 5:07 | — | — | 5:08 | — | — | 5:08 | — | — | 5:09 | — | — | 5:10 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 11 | 18 | 17 | 13 | 21 | 20 | 14 | 18 | 15 | 10 | 13 | 13 | 10 | 18 | 16 | 12 | 16 | 16 | 13 |
Feels °C | 14 | 9 | 15 | 14 | 11 | 19 | 18 | 11 | 12 | 9 | 4 | 9 | 9 | 5 | 12 | 10 | 8 | 13 | 14 | 9 |
Swell 1 Height (m) Direction Period (s) | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | S 8 | S 9 | S 10 | S 13 | S 11 | S 11 | S 12 | S 11 | S 10 | S 9 |
| kJ | 572 | 419 | 331 | 286 | 218 | 179 | 175 | 103 | 73 | 73 | 203 | 351 | 290 | 787 | 358 | 244 | 324 | 332 | 239 | 198 |
Swell 2 Height (m) Direction Period (s) | S 11 | S 11 | S 10 | S 10 | S 10 | SSE 10 | S 11 | S 10 | S 10 | S 8 | ENE 9 | ENE 9 | NE 8 | ENE 8 | ENE 8 | SSE 18 | ENE 8 | ENE 8 | NE 8 | NE 8 |
| kJ | 93 | 57 | 35 | 31 | 17 | 19 | 21 | 8 | 8 | 28 | 45 | 29 | 18 | 14 | 14 | 31 | 7 | 6 | 2 | 2 |
Swell 3 Height (m) Direction Period (s) | SSE 15 | SE 14 | SSE 15 | SSE 14 | SE 13 | SE 13 | S 12 | — | E 9 | E 8 | SE 8 | E 7 | SSE 20 | — | S 20 | ENE 8 | — | E 8 | E 8 | — |
| kJ | 21 | 8 | 21 | 20 | 7 | 6 | 3 | — | 2 | 1 | 2 | 1 | 81 | — | 8 | 6 | — | 1 | 1 | — |
Wind waves Height (m) Direction Period (s) | NE 3 | NNW 3 | N 3 | NE 4 | NNW 2 | — | — | W 3 | SW 3 | WSW 3 | WSW 3 | — | — | WNW 3 | W 3 | — | WSW 3 | WSW 3 | — | — |
| kJ | 4 | 2 | 4 | 13 | 1 | — | — | 2 | 5 | 6 | 3 | — | — | 3 | 1 | — | 3 | 2 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 2 | 0 | 0 | 98 | 0 | 0 | 0 | 0 | 2 | 2 | 2 | 0 | 6 | 0 | 2 | 2 | 0 | 0 | 0 | 2 |
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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