Surf Forecasts:
Thirroul surf forecast from 7 Sep 2026:
- Best quality surf: Friday 11 Sep, 1AM (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, SSE swell with 2,667 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 0.4m 3s period and expected on Wednesday (Sep 09) at 4AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Tue 8th Sep) | 4.5ft (1.3m) 9s |
| Best Surf | 1AM (Fri 11th 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
G’day, Rusty here. Let’s talk Thirroul in feet and miles per hour.
Right off the bat, the first few days are a bit of a mess. Monday afternoon has a 5ft SSE swell with a cross-onshore breeze, making it choppy and ugly. Energy is weak at 340.
Tuesday morning bumps up to 7ft SSE but the wind is cross, creating a messy chop. Energy is moderate at 646. Tuesday afternoon turns onshore with a 6ft swell, still no good.
Wednesday is a write-off. The morning is poor, and by the afternoon we’ve got a 10ft S swell with a 22 mph cross wind and lumpy chop. That’s kite-surfing conditions, not for paddling. Energy is strong at 1325.
Thursday has size — 8ft to 10ft — but the wind stays cross to cross-on, ruining quality. Friday is similar, dropping from 8ft to 6ft, still messy.
Now, the standout: Saturday the 12th of September. The morning session is clean with a light cross-offshore breeze. A 4ft SSE groundswell with a long 11-second period — proper shape for the reef. Combined energy is moderate at 440. Water temp is 64°, average for this time of year. The crowd is only sometimes an issue, so you might score some peace. That’s the one.
Sunday the 13th morning is smaller at 3ft but still clean with light cross-off wind. Surfable but ordinary. Monday the 14th is tiny.
We get another gap until Wednesday the 16th morning — 4ft SSE, light cross-off, clean. Not special but doable.
Thursday the 17th kicks up to 8ft S with cross wind — marginal. Friday the 18th sees big 12ft to 13ft SSE groundswell with a long 12-second period and massive energy of 3620. The point and reef will handle it better than the beach, but the wind is cross to cross-on, so it’s expert-only and lumpy.
The 19th and 20th drop to 6ft to 6ft SSE with light cross winds — average. The 21st is tiny with glassy conditions but only 2ft.
Tuesday the 22nd morning offers a 5ft SSE wind swell (short 7-second period), but it’s clean with a cross-off breeze.
The best bet is Saturday the 12th morning — clean, 4ft groundswell, offshore wind. The rest is either small, messy, or for experts only.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Mon night. Very mild (max 16°C on Tue morning, min 9°C on Tue night). Winds increasing (light winds from the NE on Tue afternoon, fresh winds from the S by Wed afternoon). | Days 5-7 Weather SummaryMostly dry. Warm (max 24°C on Sun morning, min 10°C on Fri night). Wind will be generally light. | ||||||||||||||||||
Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | ||||||||||||||
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 | SSE 8 | SSE 8 | 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 9 | SSE 9 | SSE 10 | SSE 10 |
Wave Graph  | |||||||||||||||||||
 kJ | 1375 | 629 | 450 | 173 | 157 | 1142 | 1840 | 2137 | 1396 | 1245 | 739 | 528 | 399 | 431 | 260 | 153 | 115 | 125 | 133 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | on | off | cross | cross-on | cross-off | cross | cross-on | cross-off | cross-on | on | off | cross-off | cross | off | cross-off | cross | off |
High Tide | 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 | 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 | ||||||
 |  |  |  |  | |  | | | | | | | | | | | | | |
 | — | 6:05 | — | — | 6:05 | — | — | 6:03 | — | — | 6:01 | — | — | 6:01 | — | — | 5:58 | — | — |
 | — | — | 5:42 | — | — | 5:42 | — | — | 5:43 | — | — | 5:44 | — | — | 5:45 | — | — | 5:45 | — |
mm | 1 | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 16 | 16 | 11 | 15 | 14 | 13 | 15 | 15 | 13 | 17 | 16 | 12 | 22 | 19 | 14 | 24 | 22 | 17 |
Feels °C | 8 | 12 | 13 | 9 | 10 | 6 | 5 | 8 | 9 | 9 | 15 | 14 | 11 | 17 | 14 | 12 | 19 | 18 | 15 |
Swell 1 Height (m) Direction Period (s) | E 10 | E 11 | SSE 8 | S 8 | SE 7 | ESE 13 | ESE 11 | S 10 | SSE 22 | SE 22 | SSE 9 | SSE 9 | SSE 10 | SSE 11 | SSE 10 | SSE 9 | SSE 9 | SSE 10 | SSE 10 |
| kJ | 9 | 2 | 450 | 173 | 43 | 17 | 42 | 1490 | 166 | 18 | 739 | 528 | 399 | 431 | 260 | 153 | 115 | 125 | 133 |
Swell 2 Height (m) Direction Period (s) | — | — | E 10 | SE 7 | E 9 | E 9 | E 16 | ESE 10 | ESE 9 | E 15 | E 15 | E 14 | E 13 | SSE 18 | SSE 19 | NE 5 | NE 5 | E 13 | NE 5 |
| kJ | — | — | 2 | 69 | 7 | 2 | 5 | 20 | 17 | 4 | 4 | 4 | 4 | 65 | 69 | 10 | 4 | 14 | 8 |
Swell 3 Height (m) Direction Period (s) | — | — | — | E 10 | E 15 | E 17 | — | SSE 23 | E 16 | ENE 15 | E 10 | ENE 14 | E 16 | E 14 | E 14 | SSE 20 | SSE 17 | — | E 13 |
| kJ | — | — | — | 7 | 4 | 6 | — | 103 | 5 | 21 | 2 | 19 | 5 | 15 | 16 | 129 | 59 | — | 13 |
Wind waves Height (m) Direction Period (s) | S 9 | SSE 8 | — | NW 2 | S 8 | S 8 | S 10 | S 10 | SSE 10 | SSE 10 | — | — | — | NNW 2 | NE 4 | NNE 5 | — | NE 4 | — |
| kJ | 1375 | 629 | — | 1 | 157 | 1142 | 1840 | 2137 | 1396 | 1245 | — | — | — | 1 | 13 | 25 | — | 9 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 40 | 39 | 38 | 36 | 0 | 5 | 821 | 11 | 79 | 299 | 5 | 27 | 48 | 0 | 0 | 94 | 0 | 0 | 51 |
Best forecast wave conditions in Illawarra | |||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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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