Surf Forecasts:
Thirroul surf forecast from 18 Jul 2026:
- Best quality surf: Sunday 19 Jul, 7PM (local time) - 5ft (1.6m), 10s period, ENE swell with glassy winds.
- Most powerful swell: Sunday 19 Jul, 10AM (local time) - 5.5ft (1.7m), 11s period, ENE swell with 705 kJ wave energy.
- Next surfable swell (1★+): Sunday 19 Jul, 7PM (local time) - 5ft (1.6m), 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 Sunday (Jul 19) at 7PM. The primary swell is predicted to be 1.6m and 10s period with a secondary swell of 0.5m and 13s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Thirroul in the next 16 days are 1.7m 11s and forecast to arrive on Sunday (Jul 19) at 10AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Thursday (Jul 23) at 4AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7PM (Sun 19th Jul) | 5ft (1.6m) 10s |
| Best Surf | 7PM (Sun 19th Jul) | 5ft (1.6m) 10s |
| Most Powerful | 10AM (Sun 19th Jul) | 5.5ft (1.7m) 11s |
Table - best surf conditions forecast for Thirroul over the next 16 days.
The Lowdown
Alright, Rusty here. Let's break down what Mother Nature's got cooking for us.
First up, we've got a pretty extended run of small to mid-period ENE groundswell through to early next week, but the wind and ride quality are all over the shop. Water temp is about what you'd expect for this time of year.
Sunday the 19th is a total no-go. Monday morning the 20th offers a glimmer of hope at Thirroul. Clean 5ft swell out of the ENE with a light cross-offshore breeze. The energy is moderate (663) and the conditions look tidy. That's your best bet in the first few days, but it's not a world-beater.
Tuesday and Wednesday see the size and energy drop right off. Wednesday morning does have a light offshore from the WNW on a puny 3ft ENE swell - you could get wet, but that's about all.
Things change late Thursday the 23rd. A fresh S swell rolls in during the afternoon, 7ft but with a short 8-second period and a cross-shore wind. It's a bit of a mess. Friday morning the 24th cleans up nicely with a glassy cross-offshore breeze on a 4ft S swell. A solid call for a quick paddle.
The weekend of the 25th and 26th is where it's at. Saturday the 25th serves up a 3ft S groundswell with glassy conditions – silky smooth. The energy is moderate (349). Sunday the 26th is almost a carbon copy: 4ft S swell and glassy again. These two mornings are the absolute cream of the crop. Do not miss them.
The start of the following week is flat and unremarkable. Then, on Wednesday the 29th, we get a proper bump of S swell. Wednesday afternoon is the pick of the bunch: clean offshore west wind and a solid 6ft SSE groundswell with a juicy 12-second period. The energy is strong (933). This one's a standout, but it's a week and a half out, so don't book the day off just yet.
From Thursday the 30th all the way through to Monday the 3rd of August, the wind cranks up from the south. Swell sizes hit 7ft to 8ft, but with fresh to strong southerly cross-shore winds, it's going to be a lumpy, choppy mess. The energy is very high (over 1200 at times) but the quality is absolutely trashed. This is kitesurfing territory, not surfboard stuff.
So, the bottom line: lock in the glassy mornings of Saturday the 25th and Sunday the 26th of July. Wednesday the 29th afternoon is a promising long-range shout if the offshore wind plays ball.
Stay stoked,
Rusty.
Short Range ForecastMostly dry. Very mild (max 17°C on Mon morning, min 9°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Thu afternoon. Warm (max 21°C on Wed morning, min 6°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | ||||||||||||||
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) | E 8 | ENE 11 | ENE 11 | ENE 11 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | S 8 | S 7 | S 8 | S 10 | S 9 |
Wave Graph  | |||||||||||||||||||
 kJ | 121 | 705 | 631 | 619 | 551 | 487 | 396 | 314 | 346 | 269 | 164 | 161 | 94 | 73 | 568 | 215 | 234 | 220 | 79 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | off | cross-off | cross | cross-off | cross-off | cross | off | off | cross-off | cross-off | cross-off | cross | cross | cross-off | off | off |
High Tide | 11:18PM1.47m | 12:12PM1.24m | 00:06AM1.30m | 1:01PM1.26m | 00:57AM1.14m | 1:53PM1.27m | 1:54AM1.01m | 2:46PM1.28m | 3:00AM0.92m | 3:41PM1.30m | 4:12AM0.87m | 4:35PM1.33m | |||||||
Low Tide | 5:54AM0.13m | 6:03PM0.40m | 6:34AM0.22m | 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 | |||||||
 |  |  |  | | | | | | |  | | | |  |  | | | | |
 | — | 6:58 | — | — | 6:58 | — | — | 6:56 | — | — | 6:56 | — | — | 6:56 | — | — | 6:56 | — | — |
 | — | — | 5:06 | — | — | 5:07 | — | — | 5:07 | — | — | 5:07 | — | — | 5:08 | — | — | 5:08 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — | — |
Temp °C | 14 | 15 | 14 | 12 | 17 | 16 | 11 | 17 | 17 | 12 | 21 | 20 | 14 | 16 | 16 | 11 | 15 | 17 | 9 |
Feels °C | 12 | 13 | 13 | 12 | 15 | 13 | 9 | 14 | 14 | 11 | 18 | 18 | 10 | 9 | 12 | 6 | 11 | 13 | 5 |
Swell 1 Height (m) Direction Period (s) | E 8 | ENE 11 | ENE 11 | ENE 11 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | S 9 | S 7 | S 8 | S 10 | S 9 |
| kJ | 121 | 705 | 631 | 619 | 551 | 487 | 396 | 314 | 346 | 269 | 164 | 161 | 94 | 73 | 348 | 215 | 234 | 220 | 79 |
Swell 2 Height (m) Direction Period (s) | S 8 | S 17 | S 16 | S 12 | S 12 | S 11 | S 11 | S 10 | S 10 | S 10 | S 10 | S 11 | S 10 | SSW 5 | ENE 9 | ENE 9 | ENE 9 | ENE 8 | NE 8 |
| kJ | 22 | 149 | 126 | 110 | 103 | 93 | 57 | 35 | 31 | 17 | 17 | 21 | 8 | 4 | 70 | 53 | 29 | 28 | 18 |
Swell 3 Height (m) Direction Period (s) | SSE 18 | SE 17 | SE 16 | SE 16 | SE 15 | SE 15 | SE 14 | SSE 15 | SSE 14 | SE 13 | SE 13 | S 12 | — | S 10 | E 9 | E 8 | E 7 | E 7 | S 21 |
| kJ | 64 | 12 | 11 | 10 | 9 | 8 | 8 | 21 | 20 | 7 | 7 | 3 | — | 8 | 2 | 1 | 1 | 1 | 34 |
Wind waves Height (m) Direction Period (s) | — | SSW 3 | — | — | — | NE 3 | NW 3 | NNW 3 | NE 4 | NNW 3 | — | WSW 3 | WSW 3 | WSW 3 | S 8 | — | — | — | W 3 |
| kJ | — | 4 | — | — | — | 3 | 1 | 1 | 23 | 1 | — | 3 | 9 | 2 | 568 | — | — | — | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 5 | 5 | 5 | 0 | 0 | 2 | 0 | 0 | 124 | 0 | 0 | 0 | 2 | 38 | 2 | 5 | 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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