
Surf Forecasts:
Thirroul surf forecast from 7 Sep 2026:
- Best quality surf: Thursday 10 Sep, 10PM (local time) - 8ft (2.5m), 10s period, SSE swell with cross-offshore winds.
- Most powerful swell: Wednesday 9 Sep, 10PM (local time) - 11ft (3.5m), 10s period, S swell with 2,448 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 10PM (local time) - 4.5ft (1.3m), 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 08) at 10PM. The primary swell is predicted to be 1.3m and 9s period with a secondary swell of 0.9m and 7s. 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 Wednesday (Sep 09) at 10PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Saturday (Sep 12) at 10PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Tue 8th Sep) | 4.5ft (1.3m) 9s |
| Best Surf | 10PM (Thu 10th Sep) | 8ft (2.5m) 10s |
| Most Powerful | 10PM (Wed 9th Sep) | 11ft (3.5m) 10s |
Table - best surf conditions forecast for Thirroul over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s on offer at Thirroul over the next couple of weeks.
The week starts off a bit average, but we’ve got a couple of windows that look promising, especially if you can wait it out. The water temp is sitting at 64°, which is pretty much bang on average for this time of year, so don’t expect any surprises when you get in.
Monday the 7th is the best bet early on. The morning session is where it’s at with a clean 5ft swell from the SSE and a light cross-offshore breeze from the NNW. The energy is weak (311), so it’s not a powerhouse, but it’ll be fun and clean. The period is short at 8 seconds, so it’s a bit of a wind-swell feel, but it’ll be rideable. The afternoon turns ugly as the wind swings onshore, so make it a dawn patrol.
Tuesday the 8th has a bigger push of swell, 8ft from the SSE, and the energy is up to moderate (756). The morning is a bit messy with a cross-shore wind, but it might be okay for the more experienced. By the afternoon, the wind goes light onshore, but it’s unclear if it’s any good. I’d be cautious.
Wednesday the 9th is a write-off. Strong winds, messy surf, and a lot of energy but no quality. The afternoon gets a 10ft S swell, but with a 22 mph cross-shore, it’s just a washing machine. At that size and with those winds, Thirroul’s beach-and-reef setup would be more interesting for the kite crew than paddle surfers.
Thursday the 10th is still big and messy. A 8ft S swell in the morning, but the wind is cross-shore. The afternoon sees a 10ft SSE swell, but it’s choppy and cross-onshore. Not a day for the faint-hearted.
Friday the 11th is a bit more manageable, with a 7ft SSE swell in the morning, but the wind is light cross-onshore. It’s not clean, but it’s surfable. Afternoon is similar.
Saturday the 12th morning has a 5ft SSE swell with a very long period of 11 seconds and a light onshore wind. The set waves will be well-shaped and have some punch, but the onshore breeze will put a bit of texture on it. The energy is moderate (588). The crowd factor is a thing here – it’s “sometimes” busy, so you might have some company.
We then hit a dry spell from Sunday the 13th through to Tuesday the 15th. The surf drops right off, with tiny waves and poor conditions. It’s a real lull, so don’t bother.
Wednesday the 16th is a standout day. The morning session is calling out as the best of the whole forecast. A clean 7ft S swell with a cross-offshore wind from the NNW. The energy is moderate (594) and the period is 8 seconds, so it’s a punchy, chest-to-head-high wave. The light offshore breeze will keep the faces clean. This is the one to circle.
Thursday the 17th is a drop-off, with a 3ft S swell and clean morning conditions, but it’s not going to get the heart racing.
Friday the 18th morning offers a clean 2ft S swell – small, but clean.
Saturday the 19th sees a tiny 3ft NE swell in the morning, but the afternoon has a clean 4ft SSE swell with a solid offshore wind from the W. The period is short (5 seconds), so it’s a bit of a bumpy short-period wave, but it’ll be fun for a small-wave board.
Sunday the 20th and Monday the 21st are back to tiny, poor surf.
Tuesday the 22nd is the second big standout. The morning delivers a very solid 10ft S swell with a clean, cross-offshore wind. The energy is very strong (1449). This is a serious swell, only for experienced surfers. The period is 9 seconds, so it’s a powerful, fast-moving wave. The afternoon sees the swell drop to 8ft, still good, but the wind goes cross-shore. Get on it early.
So, to wrap it up: the best is Wednesday the 16th morning for a fun, clean session, and Tuesday the 22nd morning for the bigger, more challenging stuff. The rest of the time is a mix of average or blown-out conditions.
Rusty.
Short Range ForecastSome drizzle, heaviest during Mon night. Warm (max 21°C on Mon morning, min 9°C on Tue night). Winds increasing (light winds from the NNW on Mon morning, fresh winds from the S by Wed afternoon). | Days 4-6 Weather SummaryMostly dry. Very mild (max 18°C on Fri morning, min 10°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | |||||||||||||||
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) | SSE 8 | SSE 9 | SSE 9 | SSE 9 | SSE 9 | S 8 | S 8 | S 8 | S 10 | S 10 | SSE 10 | SSE 10 | SSE 9 | SSE 9 | SSE 10 | SSE 11 | SSE 10 | SSE 10 | SSE 9 | SSE 9 | SSE 9 |
Wave Graph | |||||||||||||||||||||
238 | 336 | 1393 | 754 | 559 | 210 | 157 | 1190 | 2016 | 1346 | 1706 | 1270 | 739 | 585 | 529 | 541 | 373 | 248 | 146 | 113 | 92 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross | cross | on | off | cross | cross | cross-off | cross | cross-on | cross-off | cross-on | cross-on | cross-off | on | cross-on | off | cross-off | cross | off |
High Tide | 4:59PM1.53m | 5:58AM1.09m | 5:56PM1.59m | 6:46AM1.18m | 6:46PM1.62m | 7:28AM1.27m | 7:32PM1.61m | 8:08AM1.35m | 8:15PM1.56m | 8:46AM1.41m | 8:57PM1.46m | 9:23AM1.44m | 9:37PM1.35m | ||||||||
Low Tide | 10:24AM0.42m | 11:54PM0.14m | 11:28AM0.35m | 00:42AM0.07m | 12:24PM0.27m | 1:23AM0.03m | 1:15PM0.21m | 2:01AM0.03m | 2:02PM0.17m | 2:37AM0.06m | 2:48PM0.16m | 3:10AM0.12m | 3:33PM0.18m | 3:42AM0.20m | |||||||
6:07 | — | — | 6:05 | — | — | 6:05 | — | — | 6:03 | — | — | 6:01 | — | — | 6:01 | — | — | 5:58 | — | — | |
— | 5:40 | — | — | 5:42 | — | — | 5:42 | — | — | 5:43 | — | — | 5:44 | — | — | 5:45 | — | — | 5:45 | — | |
mm | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 18 | 13 | 16 | 16 | 11 | 15 | 14 | 13 | 15 | 15 | 12 | 18 | 16 | 11 | 17 | 16 | 11 | 22 | 20 | 16 |
Feels °C | 19 | 15 | 6 | 13 | 14 | 9 | 10 | 5 | 5 | 9 | 10 | 9 | 14 | 12 | 8 | 14 | 13 | 9 | 16 | 14 | 13 |
Swell 1 Height (m) Direction Period (s) | SSE 8 | E 10 | E 10 | E 11 | SSE 9 | S 8 | SE 7 | ESE 13 | ESE 11 | ESE 10 | SSE 22 | E 15 | SSE 9 | SSE 9 | SSE 10 | SSE 11 | SSE 10 | SSE 10 | SSE 9 | SSE 9 | SSE 9 |
238 | 8 | 9 | 2 | 559 | 210 | 53 | 34 | 70 | 33 | 95 | 4 | 739 | 585 | 529 | 541 | 373 | 248 | 146 | 113 | 92 | |
Swell 2 Height (m) Direction Period (s) | SSE 10 | NE 7 | — | — | E 10 | SE 7 | E 9 | E 9 | S 24 | SSE 22 | ESE 9 | S 22 | E 15 | E 14 | E 13 | SSE 18 | SSE 17 | E 14 | E 13 | ENE 13 | NE 5 |
71 | 2 | — | — | 2 | 75 | 2 | 2 | 12 | 50 | 17 | 9 | 4 | 4 | 14 | 32 | 55 | 15 | 14 | 17 | 23 | |
Swell 3 Height (m) Direction Period (s) | NE 8 | — | — | — | — | E 10 | E 15 | E 17 | S 24 | E 16 | E 16 | — | E 10 | ENE 14 | E 9 | E 14 | ENE 14 | ENE 14 | E 9 | — | E 13 |
2 | — | — | — | — | 2 | 4 | 6 | 11 | 5 | 5 | — | 2 | 19 | 2 | 15 | 19 | 19 | 2 | — | 13 | |
Wind waves Height (m) Direction Period (s) | — | SSE 9 | SSE 9 | SSE 9 | — | NW 2 | S 8 | S 8 | S 10 | S 10 | SSE 10 | SSE 10 | — | — | — | — | NE 3 | N 3 | NNE 4 | NE 4 | — |
— | 336 | 1393 | 754 | — | 1 | 157 | 1190 | 2016 | 1346 | 1706 | 1270 | — | — | — | — | 4 | 5 | 2 | 32 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 94 | 39 | 38 | 36 | 0 | 48 | 415 | 11 | 39 | 118 | 0 | 5 | 5 | 0 | 10 | 40 | 0 | 0 | 52 | 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.










