Surf Forecasts:
Thirroul surf forecast from 31 Aug 2026:
- Best quality surf: Tuesday 1 Sep, 4PM (local time) - 2.5ft (0.8m), 10s period, S swell with cross-offshore winds.
- Most powerful swell: Monday 7 Sep, 4AM (local time) - 3ft (0.9m), 11s period, S swell with 209 kJ wave energy.
- Next surfable swell (1★+): Tuesday 1 Sep, 4AM (local time) - 2.5ft (0.7m), 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 Tuesday (Sep 01) at 4AM. The primary swell is predicted to be 0.7m and 9s period with a secondary swell of 0.4m 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 0.9m 11s and forecast to arrive on Monday (Sep 07) at 4AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Saturday (Sep 05) at 4PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Tue 1st Sep) | 2.5ft (0.7m) 9s |
| Best Surf | 4PM (Tue 1st Sep) | 2.5ft (0.8m) 10s |
| Most Powerful | 4AM (Mon 7th Sep) | 3ft (0.9m) 11s |
Table - best surf conditions forecast for Thirroul over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s look at what’s shaping up over the next 16 days for this area. It’s a slow start, but there’s one day that’ll get your heart pumping if you wait it out.
Tuesday 1st September we’ve got small surf at Thirroul—0.8ft southerly swell, 11-second period, with a light cross-off breeze from the NNW. The energy is moderate (175), waves are surfable but nothing to write home about. Water temp is about average for the season. Crowds sometimes show up here, so expect a few friends.
From Wednesday 2nd through to Tuesday 8th, it’s mostly flat or poor. Swell stays below 2ft, winds are all over the place, and the energy is weak. A few mornings clean up, but there’s barely a wave to ride.
Then Wednesday 9th September—bingo. The morning delivers a solid 10ft southerly groundswell, period 10 seconds, and glassy conditions with a light SE breeze. That’s big—over 8ft, so experts only. The combined energy is massive (3263)—strong and powerful. This is the one: excellent surf for experienced surfers. The afternoon drops to 8ft with onshore wind, so hit it early. The S swell direction is a perfect match for the break.
After that, Thursday 10th to Monday 14th is small and messy—mostly under 3ft. Tuesday 15th sees a 5ft southerly but with short period and onshore winds—choppy and ugly.
The standout is clear: Wednesday 9th September morning at Thirroul, with that 10ft S swell and glassy glass. Mark it on your calendar, but respect the size. The rest of the run is quiet.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Wed morning, min 12°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Sat morning, min 11°C on Sat night). Winds increasing (light winds from the NW on Fri afternoon, fresh winds from the WNW by Sat afternoon). | ||||||||||||||||||
Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | ||||||||||||||
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 9 | S 11 | S 10 | S 10 | S 10 | S 10 | S 10 | SSE 10 | SSE 10 | SSE 10 | S 11 | S 8 | S 10 | S 9 | S 9 | S 9 | S 9 | S 8 | SSE 13 |
Wave Graph  | |||||||||||||||||||
 kJ | 101 | 149 | 138 | 98 | 77 | 73 | 49 | 62 | 34 | 33 | 110 | 45 | 55 | 41 | 26 | 16 | 104 | 45 | 168 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off | off | cross-off | glassy | cross-on | off |
High Tide | 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 | 4:22AM0.18m | 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 | — | — | 6:13 | — | — | 6:13 | — | — | 6:11 | — | — | 6:09 | — | — | 6:09 | — | — |
 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:38 | — | — | 5:39 | — | — | 5:39 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 25 | 24 | 17 | 26 | 26 | 19 | 22 | 21 | 15 | 20 | 20 | 15 | 26 | 25 | 17 | 17 | 16 | 14 |
Feels °C | 12 | 20 | 21 | 14 | 22 | 23 | 16 | 16 | 16 | 10 | 16 | 15 | 13 | 20 | 19 | 13 | 13 | 13 | 13 |
Swell 1 Height (m) Direction Period (s) | S 9 | S 11 | S 10 | S 10 | S 10 | S 10 | S 10 | SSE 10 | SSE 10 | SSE 10 | S 11 | S 8 | S 7 | NE 6 | NE 6 | ENE 6 | S 9 | S 8 | SSE 13 |
| kJ | 101 | 149 | 138 | 98 | 77 | 73 | 49 | 62 | 34 | 33 | 110 | 45 | 27 | 32 | 19 | 16 | 104 | 45 | 168 |
Swell 2 Height (m) Direction Period (s) | ENE 9 | ENE 9 | NE 4 | NE 6 | NE 6 | NE 6 | ENE 10 | NE 6 | NE 6 | ENE 10 | NE 7 | ENE 10 | S 10 | S 9 | S 9 | S 9 | NE 6 | S 12 | S 8 |
| kJ | 16 | 15 | 16 | 19 | 12 | 8 | 19 | 11 | 14 | 19 | 8 | 9 | 55 | 41 | 26 | 14 | 6 | 23 | 46 |
Swell 3 Height (m) Direction Period (s) | ENE 3 | E 11 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | SSE 12 | ENE 10 | ENE 10 | NE 7 | ENE 10 | SSE 12 | NE 4 | E 9 | E 9 | E 11 | E 11 | E 11 | ENE 4 |
| kJ | 1 | 10 | 22 | 20 | 19 | 19 | 30 | 18 | 19 | 7 | 19 | 14 | 5 | 7 | 6 | 9 | 9 | 9 | 6 |
Wind waves Height (m) Direction Period (s) | — | NNE 4 | NE 5 | N 2 | NNW 2 | — | NW 3 | WNW 2 | WSW 3 | WSW 3 | — | ENE 3 | — | NNW 3 | WNW 4 | SW 2 | — | ENE 6 | NE 4 |
| kJ | — | 1 | 54 | 1 | 1 | — | 2 | 1 | 6 | 4 | — | 6 | — | 2 | 24 | 1 | — | 12 | 18 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 2 | 0 | 0 | 51 | 0 | 0 | 95 | 7 | 0 | 98 | 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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