Surf Forecasts:
Thirroul surf forecast from 15 Sep 2026:
- Best quality surf: Thursday 17 Sep, 7AM (local time) - 10ft (3.0m), 10s period, S swell with cross-offshore winds.
- Most powerful swell: Wednesday 16 Sep, 10PM (local time) - 11ft (3.5m), 10s period, SSE swell with 2,413 kJ wave energy.
- Next surfable swell (1★+): Thursday 17 Sep, 7AM (local time) - 10ft (3.0m), 10s 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 Thursday (Sep 17) at 7AM. The primary swell is predicted to be 3.0m and 10s period with a secondary swell of 2.5m and 10s. Another secondary swell of 0.1m and 13s 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 Wednesday (Sep 16) 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 Sunday (Sep 20) at 4PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Thu 17th Sep) | 10ft (3.0m) 10s |
| Best Surf | 7AM (Thu 17th Sep) | 10ft (3.0m) 10s |
| Most Powerful | 10PM (Wed 16th Sep) | 11ft (3.5m) 10s |
Table - best surf conditions forecast for Thirroul over the next 16 days.
The Lowdown
Alright, Rusty here again, same spot but in old money. Thirroul’s a beach and reef break, open to the swell, and the water’s sitting at a normal 65°F for this time of year, so no drama there.
The first real look at waves comes Wednesday the 16th, but it’s a rough one. A solid 10ft south swell hits with a 30 km/h cross-shore wind out of the SSW. That’s lumpy, choppy, and a whole lot of effort for not much fun. The energy is pumping (1948), but it’s only for the die-hard experts.
Thursday the 17th morning settles a bit. We’ve got 7ft from the SSE, but the wind drops to a light 10 km/h cross-shore. It’s not clean, but it’s manageable. The energy is moderate (817) and the period is short at 9 seconds, so it’s a bit crumbly. Marginal at best.
Now, Friday the 18th morning is the clear winner. The swell drops to a clean 4ft from the SSE, and it’s glassy with a 5 km/h ESE breeze. That’s pure magic. The energy is still solid (362) and the 9-second period keeps things fun. Expect company though—crowds are a possibility. This is your session.
After that, it fades fast. Saturday the 19th morning has tiny 3ft waves and a light cross-offshore wind, so it’s clean but small. Energy drops to 167. By Sunday the 20th, it’s almost flat at 1ft with energy down to 33. That kicks off a dry spell. Monday and Tuesday the 21st and 22nd see a bump back to around 4ft, but every session is plagued with onshore SSE winds at 15-20 km/h, making it choppy and messy.
The second week is a write-off. From the 23rd to the 30th of September, it’s mostly onshore or cross-on winds, and swell rarely gets over 5ft. Friday the 25th morning is glassy with a small 2ft south swell and a long 11-second period, but it’s tiny (energy 114). By Tuesday the 30th, we’ve got 40 km/h cross-onshore winds and messy conditions—definitely kite territory.
Bottom line: Friday the 18th morning is your only real standout. After that, it’s a long, wind-affected slog. Stay tuned, because things can change, but right now, that’s the play.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Tue afternoon. Very mild (max 19°C on Fri morning, min 8°C on Wed night). Winds decreasing (fresh winds from the S on Tue afternoon, calm by Thu afternoon). | Days 5-7 Weather SummaryMostly dry. Warm (max 29°C on Sun morning, min 16°C on Fri night). Wind will be generally light. | |||||||||||||||||||
Tue 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | ||||||||||||||
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 6 | SSE 9 | S 10 | S 10 | SSE 10 | SSE 9 | SSE 9 | SSE 9 | SSE 9 | S 10 | S 9 | S 9 | S 9 | S 9 | S 9 | SSE 22 | SSE 18 | SSE 7 | SSE 8 | SSE 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 103 | 1302 | 1940 | 1725 | 2142 | 807 | 488 | 307 | 295 | 220 | 108 | 108 | 87 | 42 | 25 | 47 | 107 | 135 | 284 | 117 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | cross-on | cross | cross | cross-on | off | glassy | cross-on | off | cross-off | cross-off | cross-off | cross-off | cross | off | cross-on | cross-on | cross-on |
High Tide | 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 | 3:17PM1.23m | 4:28AM0.90m | 4:18PM1.27m | ||||||||
Low Tide | 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 | 8:26AM0.60m | 10:27PM0.42m | 9:42AM0.57m | 11:15PM0.36m | |||||||
 |  |  | |  | | |  | | | | | | | | | |  |  |  | |
 | — | — | 5:54 | — | — | 5:54 | — | — | 5:52 | — | — | 5:50 | — | — | 5:50 | — | — | 5:48 | — | — |
 | 5:46 | — | — | 5:46 | — | — | 5:47 | — | — | 5:49 | — | — | 5:49 | — | — | 5:50 | — | — | 5:51 | — |
mm | 1 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 |
Temp °C | 18 | 12 | 14 | 14 | 13 | 15 | 14 | 10 | 19 | 18 | 17 | 26 | 27 | 20 | 29 | 27 | 21 | 19 | 17 | 14 |
Feels °C | 16 | 7 | 6 | 6 | 6 | 11 | 11 | 8 | 16 | 16 | 12 | 22 | 24 | 17 | 25 | 25 | 18 | 16 | 14 | 11 |
Swell 1 Height (m) Direction Period (s) | NE 7 | NE 7 | NE 14 | NE 12 | E 13 | SSE 9 | SSE 9 | SSE 9 | SSE 9 | S 10 | S 9 | S 9 | S 9 | S 9 | S 9 | S 10 | SSE 18 | SSE 7 | SSE 8 | SSE 12 |
| kJ | 39 | 7 | 8 | 6 | 3 | 807 | 488 | 307 | 295 | 220 | 108 | 108 | 87 | 42 | 25 | 17 | 107 | 135 | 284 | 47 |
Swell 2 Height (m) Direction Period (s) | E 13 | E 14 | — | E 15 | — | E 13 | E 13 | E 13 | SSE 18 | ESE 7 | SSE 15 | SSE 17 | SSE 17 | S 17 | S 17 | SSE 22 | S 9 | SSE 15 | NE 4 | NE 5 |
| kJ | 3 | 4 | — | 4 | — | 3 | 3 | 3 | 64 | 31 | 78 | 57 | 27 | 6 | 6 | 47 | 15 | 23 | 1 | 1 |
Swell 3 Height (m) Direction Period (s) | — | S 16 | — | — | — | NE 13 | S 19 | S 19 | E 12 | SSE 17 | ESE 8 | SE 8 | NE 4 | E 12 | E 11 | NNE 3 | NE 4 | NE 4 | E 11 | E 11 |
| kJ | — | 5 | — | — | — | 7 | 7 | 7 | 3 | 100 | 6 | 2 | 1 | 3 | 2 | 1 | 2 | 1 | 2 | 2 |
Wind waves Height (m) Direction Period (s) | SSE 6 | SSE 9 | S 10 | S 10 | SSE 10 | — | — | — | — | NE 2 | WNW 2 | — | — | NW 2 | WNW 2 | NNE 3 | WSW 2 | — | — | SSE 7 |
| kJ | 103 | 1302 | 1940 | 1725 | 2142 | — | — | — | — | 2 | 1 | — | — | 1 | 1 | 5 | 1 | — | — | 117 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1279 | 86 | 658 | 658 | 39 | 5 | 40 | 0 | 0 | 6 | 0 | 0 | 0 | 0 | 10 | 19 | 0 | 140 | 468 | 48 |
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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