Surf Forecasts:
Thirroul surf forecast from 30 Aug 2026:
- Best quality surf: Monday 31 Aug, 7AM (local time) - 3ft (0.9m), 9s period, S swell with offshore winds.
- Most powerful swell: Sunday 6 Sep, 7AM (local time) - 3.5ft (1.1m), 11s period, S swell with 300 kJ wave energy.
- Next surfable swell (1★+): Monday 31 Aug, 7AM (local time) - 3ft (0.9m), 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 Monday (Aug 31) at 7AM. The primary swell is predicted to be 0.9m and 9s period with a secondary swell of 0.4m and 16s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Thirroul in the next 16 days are 1.1m 11s and forecast to arrive on Sunday (Sep 06) at 7AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Saturday (Sep 05) at 1PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Mon 31st Aug) | 3ft (0.9m) 9s |
| Best Surf | 7AM (Mon 31st Aug) | 3ft (0.9m) 9s |
| Most Powerful | 7AM (Sun 6th Sep) | 3.5ft (1.1m) 11s |
Table - best surf conditions forecast for Thirroul over the next 16 days.
The Lowdown
Alright folks, Rusty here with a look at what's coming up for our stretch of coast.
Right off the bat, we've got a bit of a slow start. Monday the 31st of August has some small, weak swell around, but it's nothing to get excited about. The real story is that the conditions are pretty ordinary. We'll see a few days of small, clean waves but nothing with any real punch. The best of this early period looks like Tuesday afternoon, the 1st of September, with clean, cross-offshore winds and a little bump in energy. The swell is small at 2ft from the south, but it's clean and the energy is moderate (205). For a quick after-work session, it might be okay.
Things drop right off for a few days after that. From Wednesday the 2nd through to the weekend, we're looking at pretty poor surf with very weak, small swells and next to no energy. It's a bit of a dead spell.
Now, hold on to your board, because things start to get interesting around Sunday the 6th of September. That morning we're looking at a 4ft south swell, with glassy conditions. The combined energy is moderate (275) and it's a clean setup. That's a standout for the period.
Monday the 7th of September is also a good one. The morning session has a clean 4ft south swell with a moderate 11-second period and cross-offshore winds. The energy is kicking into a higher gear at 395. It's looking like a solid option.
We get another clean morning on Tuesday the 8th of September, with a 3ft SSE swell, glassy conditions, and moderate energy (225). It's a nice, clean wave.
Then it gets a bit gnarly. Wednesday the 9th of September sees a big jump in size with a 10ft south swell, but with poor cross-onshore winds. The energy is very strong (3170), but this is only for the experts and the conditions are messy. There's a lot of water moving.
Into the second week, we've got a few more windows. Friday the 11th of September morning has a clean 5ft south swell, but the period is short at 7 seconds. The energy is moderate (375). It's a look, but don't expect the best shape.
The final standout is Tuesday the 15th of September morning. An 8ft south swell rolls in, with a 9-second period and cross-shore winds. The energy is strong (971). This is a solid swell, but it's big enough that it's only for experienced surfers, and the cross-shore wind will put a bit of a chop on the faces.
Water temp is about average for this time of year, so no need for a steamer just yet.
All in all, the best bet is the Sunday the 6th of September morning for the cleanest, most fun waves, with the Monday the 7th and Tuesday the 8th of September mornings also looking good. For the bigger stuff, keep an eye on the 15th of September.
Rusty out.
Short Range ForecastMostly dry. Warm (max 27°C on Wed morning, min 12°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 25°C on Sat morning, min 11°C on Sat night). Winds increasing (light winds from the NNW on Fri afternoon, fresh winds from the W by Sat afternoon). | ||||||||||||||||||||
Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | |||||||||||||||
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 8 | S 9 | S 9 | S 11 | S 10 | S 10 | S 10 | S 10 | S 10 | S 11 | S 10 | SSE 10 | S 10 | S 8 | S 10 | S 9 | S 9 | S 9 | S 10 | S 8 | NE 6 |
Wave Graph | |||||||||||||||||||||
113 | 106 | 101 | 149 | 135 | 98 | 77 | 73 | 48 | 57 | 52 | 32 | 73 | 30 | 74 | 43 | 28 | 15 | 259 | 82 | 151 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross | cross-off | cross-off | cross-off | cross-off | off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | off | off | cross-off | cross-off | cross-on | cross |
High Tide | 10:03AM1.38m | 10:11PM1.34m | 10:43AM1.41m | 10:56PM1.23m | 11:28AM1.41m | 11:50PM1.11m | 12:22PM1.41m | 00:56AM1.01m | 1:27PM1.40m | 2:19AM0.94m | 2:40PM1.42m | 3:46AM0.95m | 3:54PM1.47m | ||||||||
Low Tide | 4:08PM0.25m | 4:22AM0.18m | 4:58PM0.28m | 5:01AM0.25m | 5:55PM0.31m | 5:45AM0.32m | 7:04PM0.34m | 6:40AM0.40m | 8:25PM0.34m | 7:50AM0.45m | 9:47PM0.30m | 9:09AM0.46m | 10:57PM0.22m | ||||||||
6:16 | — | — | 6:16 | — | — | 6:13 | — | — | 6:13 | — | — | 6:11 | — | — | 6:09 | — | — | 6:09 | — | — | |
— | 5:36 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:38 | — | — | 5:39 | — | — | 5:39 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 20 | 19 | 14 | 25 | 26 | 17 | 27 | 26 | 19 | 22 | 22 | 16 | 22 | 20 | 16 | 25 | 23 | 17 | 19 | 18 | 15 |
Feels °C | 17 | 16 | 13 | 21 | 23 | 15 | 23 | 23 | 16 | 16 | 17 | 11 | 18 | 16 | 14 | 20 | 17 | 14 | 15 | 14 | 13 |
Swell 1 Height (m) Direction Period (s) | S 8 | S 9 | S 9 | S 11 | S 10 | S 10 | S 10 | S 10 | S 10 | S 11 | S 10 | SSE 10 | S 10 | S 8 | S 10 | S 9 | S 9 | S 9 | S 10 | S 8 | NE 6 |
113 | 106 | 101 | 149 | 135 | 98 | 77 | 73 | 48 | 57 | 52 | 32 | 73 | 30 | 74 | 43 | 28 | 15 | 259 | 82 | 46 | |
Swell 2 Height (m) Direction Period (s) | SSE 15 | ENE 9 | NE 4 | ENE 9 | NE 5 | NE 6 | NE 6 | NE 6 | ENE 10 | ENE 10 | NE 6 | ENE 10 | ENE 10 | ENE 10 | NE 6 | NE 5 | NE 6 | NE 6 | NE 6 | S 12 | S 7 |
43 | 16 | 2 | 15 | 18 | 15 | 13 | 12 | 19 | 19 | 6 | 19 | 9 | 9 | 15 | 9 | 8 | 5 | 5 | 11 | 24 | |
Swell 3 Height (m) Direction Period (s) | ENE 9 | SSE 16 | ENE 9 | E 11 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | SSE 12 | NE 6 | ENE 10 | NE 7 | NE 7 | SSE 12 | ENE 10 | E 9 | E 9 | E 11 | E 11 | E 10 | SSE 12 |
17 | 50 | 16 | 10 | 22 | 20 | 19 | 20 | 29 | 5 | 19 | 7 | 7 | 14 | 9 | 7 | 7 | 9 | 9 | 9 | 44 | |
Wind waves Height (m) Direction Period (s) | — | — | NNE 4 | NE 4 | NE 5 | NNW 3 | WNW 2 | — | NNW 2 | WNW 2 | WSW 3 | W 4 | WSW 2 | NE 3 | NNE 6 | NNW 3 | NW 4 | WSW 4 | — | ENE 3 | NE 6 |
— | — | 8 | 2 | 67 | 2 | 1 | — | 1 | 1 | 3 | 9 | 1 | 4 | 47 | 2 | 17 | 2 | — | 6 | 151 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 52 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 2 | 0 | 0 | 40 | 0 | 0 | 95 | 7 | 0 | 660 | 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.











