Thirroul Surf Forecast and Surf Report

G’day, Rusty here. It’s going to be a bit of a mixed bag for Thirroul over the next 16 days. The first week is pretty slim pickings with mostly small, average energy waves and less-than-ideal winds. We do get a few windows of cleaner conditions, but nothing that screams “drop everything and go.” The water temp is sitting at 18° – pretty much bang on average for this time of year, so no surprises there.

Alright, let’s start with Friday morning, September 4th. It’s actually not a bad little session. Thirroul is a beach and reef setup, exposed to the S swell, and we’ve got a clean 3ft S swell rolling in with a 10-second period and moderate energy (213). The wind is a light WSW cross-off, so it’ll be glassy and clean. This is the best the first week has to offer – a true standout for the period. Crowds are possible here, so keep your eyes peeled. After that, things go flat and ordinary: Saturday with 2ft – 2ft and mostly messy winds, Sunday a tiny 2ft NE, and Monday a small 4ft S but with onshore wind kicking in by the arvo. Tuesday the 8th bumps up to 7ft – 7ft SSE, but it’s a mixed bag of cross and onshore wind with lots of energy (776 – 1033), so it’s messy and only really for the keen. Wednesday morning, the 9th, has some hope: 5ft SSE at 9 seconds, clean cross-off WSW breeze, energy of 318 – surfable and clean, but not a standout.

Then from Thursday the 10th through to the start of the second week, it gets bigger but wind-ruined. Thursday has 8ft – 10ft S swell with strong energy (1855 – 4851), but the wind is cross to cross-on and choppy. That’s expert territory with the size, but the wind kills it. Friday the 11th drops back to 7ft – 6ft SSE, still cross-shore chop. Saturday the 12th sees 5ft SSE and light onshore wind – ripply. Sunday the 13th is tiny again, 3ft.

Now, we’ve got a gap of a few days. Monday the 14th and Tuesday the 15th are mostly close to flat, with Tuesday morning offering a surprise: 6ft NE swell but only 6-second period, and clean N cross-off wind. That’s clean but short-period, so it’s a bit fat. Wednesday the 16th is poor.

The real standout for the whole outlook lands on Thursday afternoon, September 17th. That afternoon, Thirroul sees a 10ft S swell with a long 12-second period – that’s serious groundswell energy (3364). And the wind? Light W offshore. Conditions are clean. This is an expert-only session – it’s going to be big, powerful, and the long period will make it fat on the beach, but at a reefier part of the setup, it’ll be world-class. This is the one to circle on the calendar, but remember it’s two weeks out, so forecasts could shift. After that, Friday the 18th and Saturday the 19th have leftover 10ft – 7ft SSE swell but onshore winds kick in, making it lumpy and choppy again.

Best bet: Friday morning September 4th for a clean, fun surf, and the real cracker – Thursday afternoon September 17th for those who can handle big, clean groundswell.

Rusty.

Read more