
Surf Forecasts:
Thirroul surf forecast from 13 Sep 2026:
- Best quality surf: Sunday 13 Sep, 7PM (local time) - 4ft (1.2m), 6s period, NE swell with cross-offshore winds.
- Most powerful swell: Thursday 17 Sep, 4AM (local time) - 11ft (3.5m), 10s period, S swell with 2,684 kJ wave energy.
- Next surfable swell (1★+): Sunday 13 Sep, 7PM (local time) - 4ft (1.2m), 6s 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 Sunday (Sep 13) at 7PM. The primary swell is predicted to be 0.7m and 10s period with a secondary swell of 0.9m and 5s. Another secondary swell of 1.2m and 6s 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 3.5m 10s and forecast to arrive on Thursday (Sep 17) at 4AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Sunday (Sep 20) at 10AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7PM (Sun 13th Sep) | 4ft (1.2m) 6s |
| Best Surf | 7PM (Sun 13th Sep) | 4ft (1.2m) 6s |
| Most Powerful | 4AM (Thu 17th Sep) | 11ft (3.5m) 10s |
Table - best surf conditions forecast for Thirroul over the next 16 days.
The Lowdown
Alright folks, Rusty here with a look at what’s cookin’ for the next couple of weeks down at Thirroul. It’s a bit of a slow burn to start, but there’s a couple of moments that’ll get the heart pumping if you’re patient.
The water temp’s sittin’ at about 64°F, which is pretty much bang on average for this time of year, so no surprises there.
Right now, it’s pretty quiet. The first solid chance we’ve got to wet a line isn’t until Wednesday the 16th, but don't get too excited. That day brings a big jump in size – 10ft to 12ft of south swell – but the wind’s gonna be a fresh cross-shore at 19 mph, and the combined energy is a massive 1400-2134 (moderate to strong). That’s a lot of power, but with that chop, it’s gonna be a messy, lumpy mess. Only for the real die-hards who don’t mind a wrestling match.
Thursday the 17th keeps the size up at 10ft from the south with a moderate cross-shore, but the energy jumps to a whopping 3208 (strong). Still a bit rough around the edges, though. Not the cleanest, but there’s grunt there.
The real standout window, the one you wanna circle on the calendar, is Friday morning the 18th. We’ve got a drop in size to a much friendlier 4ft from the south, but the kicker is the wind – it goes glassy, dead calm. Combined energy is a healthy 314 (moderate). That’s the kind of morning where the waves have some shape, it’s clean as a whistle, and you might just have the place to yourself if the crowds aren’t on it. That’s your best bet of the whole outlook, hands down.
After that, it drops away again. We see some small clean-ish surf on Saturday the 19th (2ft, light offshore) but it’s tiny, and then a big lull with almost nothing until Monday the 21st when a 8ft SSE swell rolls in with a cross-onshore breeze. Not ideal. The next real glimmer is Saturday the 26th – another glassy morning, this time with a 5ft swell from the ENE and moderate energy (398). That’s a promising second option, a week and a half out, so keep an eye on it, but it’s a long way off.
Monday the 28th wraps things up with a 7ft S swell and light cross-onshore wind. Big energy (1158), but the onshore element will make it a bit lumpy.
So to sum it up: get out for that Friday the 18th morning glass-off if you can. The rest of the window is either too small, too messy, or just plain blown out. Hang in there.
Rusty.
Short Range ForecastSome drizzle, heaviest during Tue night. Warm (max 25°C on Mon morning, min 9°C on Tue night). Winds increasing (calm on Sun night, fresh winds from the SSW by Tue night). | Days 4-6 Weather SummaryMostly dry. Warm (max 22°C on Fri morning, min 8°C on Wed night). Winds decreasing (fresh winds from the S on Wed morning, calm by Fri morning). | ||||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | |||||||||||||||
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) | S 10 | S 10 | NE 6 | S 11 | S 10 | NE 6 | NE 7 | NE 7 | S 9 | S 10 | S 10 | S 10 | S 10 | SSE 9 | SSE 8 | S 8 | S 8 | ESE 10 | SE 10 | S 9 | S 9 |
Wave Graph | |||||||||||||||||||||
141 | 100 | 149 | 85 | 56 | 56 | 49 | 38 | 1172 | 1394 | 2124 | 2250 | 1891 | 792 | 414 | 239 | 173 | 130 | 85 | 55 | 25 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | off | cross-off | cross | off | cross | cross-on | cross-off | cross | cross | cross-off | cross | cross-on | off | glassy | cross | off | cross-off | cross | off |
High Tide | 9:37PM1.35m | 9:59AM1.44m | 10:18PM1.22m | 10:37AM1.41m | 11:00PM1.09m | 11:17AM1.36m | 11:46PM0.98m | 12:02PM1.30m | 00:43AM0.90m | 12:58PM1.25m | 1:57AM0.85m | 2:06PM1.22m | 3:21AM0.85m | ||||||||
Low Tide | 3:33PM0.18m | 3:42AM0.20m | 4:18PM0.23m | 4:14AM0.28m | 5:05PM0.29m | 4:47AM0.37m | 5:56PM0.37m | 5:23AM0.46m | 6:56PM0.43m | 6:08AM0.53m | 8:07PM0.47m | 7:08AM0.59m | 9:23PM0.47m | ||||||||
5:58 | — | — | 5:58 | — | — | 5:56 | — | — | 5:54 | — | — | 5:54 | — | — | 5:52 | — | — | 5:50 | — | — | |
— | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — | 5:47 | — | — | 5:49 | — | — | 5:49 | — | |
mm | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 20 | 16 | 25 | 24 | 20 | 22 | 18 | 11 | 14 | 14 | 12 | 15 | 14 | 10 | 22 | 21 | 16 | 26 | 24 | 18 |
Feels °C | 19 | 17 | 16 | 21 | 20 | 18 | 19 | 15 | 4 | 5 | 5 | 4 | 10 | 10 | 8 | 17 | 18 | 12 | 23 | 20 | 15 |
Swell 1 Height (m) Direction Period (s) | S 10 | S 10 | ENE 6 | NE 7 | S 10 | NE 6 | NE 7 | NE 7 | NE 7 | NE 7 | NE 12 | ENE 13 | SSE 10 | SSE 9 | SSE 8 | S 8 | S 8 | ESE 10 | SE 10 | S 9 | S 9 |
141 | 100 | 71 | 55 | 56 | 56 | 49 | 38 | 8 | 2 | 6 | 17 | 1314 | 792 | 414 | 239 | 173 | 130 | 85 | 55 | 25 | |
Swell 2 Height (m) Direction Period (s) | NE 5 | ENE 13 | S 10 | S 11 | ENE 13 | SSE 10 | S 9 | S 9 | E 14 | E 14 | E 15 | — | E 13 | E 13 | E 13 | ESE 8 | ESE 8 | S 9 | S 9 | SE 9 | SE 8 |
12 | 17 | 104 | 85 | 17 | 31 | 15 | 14 | 4 | 4 | 4 | — | 3 | 3 | 3 | 72 | 66 | 104 | 56 | 37 | 18 | |
Swell 3 Height (m) Direction Period (s) | SSE 16 | — | E 13 | E 13 | S 15 | E 12 | E 12 | E 13 | S 16 | — | — | — | — | NE 13 | — | E 13 | ESE 10 | SSE 16 | SSE 17 | SSE 17 | SSE 15 |
26 | — | 13 | 13 | 5 | 12 | 3 | 13 | 5 | — | — | — | — | 7 | — | 3 | 20 | 89 | 58 | 54 | 23 | |
Wind waves Height (m) Direction Period (s) | NE 5 | NE 5 | NE 6 | — | NE 6 | — | WSW 3 | SE 3 | S 9 | S 10 | S 10 | S 10 | S 10 | — | — | — | NE 3 | WNW 2 | — | ENE 3 | — |
31 | 45 | 149 | — | 38 | — | 1 | 11 | 1172 | 1394 | 2124 | 2250 | 1891 | — | — | — | 4 | 1 | — | 1 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 2 | 102 | 0 | 0 | 52 | 0 | 2 | 105 | 5 | 860 | 658 | 118 | 39 | 39 | 0 | 0 | 40 | 0 | 0 | 6 | 0 |
Best forecast wave conditions in Illawarra | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.










