Siriu Surf Forecast and Surf Report

Right… g’day, I’m Rusty.

Alright, let’s look at what’s coming up for Siriu. We’ve got a mixed bag here, with some decent windows but plenty of choppy days to wade through. The first proper surf on offer kicks off Thursday morning, 27 August, with a 1.6m SSE swell at 14 seconds. That period is long, so there’s some proper groundswell energy coming in – combined energy’s sitting at 1092 (moderate-to-strong) – but the wind’s a cross-shore NNE at 20 km/h, and the report calls it “marginal” with questionable tide. It’s rideable for sure, but not the standout. That afternoon, the wind cranks up to 30 km/h and goes cross-onshore, turning it lumpy and pretty ordinary.

Friday 28th sees a shift to a shorter period NE swell, dropping from 6ft down to 5ft through the day. The period is only 8 seconds, so it’s a weak windswell, not much push, and the cross wind stays moderate. Nothing to get excited about.

Now, Saturday 29th morning: a slight improvement. We’ve got 5ft ENE swell with a cross-off SSW breeze at 25 km/h giving clean conditions. That’s better – the combined energy is only 275 (weak), but it’s clean and you might snag a few. Sunday 30th morning looks your best bet early in the window: 4ft from the east, 8 second period, with a gentle cross-off SW breeze at 15 km/h and clean conditions. It’s small, but the report says “expect good surf conditions” so it’ll be fun on a log or a fish.

Monday 31st is damp with light rain and a 5ft E swell at 9 seconds. The wind is light and cross-shore, but the ride’s still only marginal. Tuesday 1st September gets a bit more interesting: the morning is clean with 4ft ENE, but then Tuesday afternoon the swell jumps to 8ft from the south at 10 seconds, with combined energy hitting 1180 (moderate-strong). The problem? The wind is a fresh cross-shore at 30 km/h, creating a lumpy mess. Get it early or forget it.

Here’s the standout. Wednesday 2nd September morning is the real winner. You’ve got a 7ft SSE groundswell at 11 seconds – that’s long period, good energy, and combined energy is 1152 (moderate-strong). The wind is a light cross-off SSW at 10 km/h, making it clean. The report calls it “excellent surf conditions for experienced surfers”. This is the session. It’s big enough (over 7ft) that it’s for experienced crew only – beginners stay out. That period will make it pitchy at a beach break, but at Siriu, which is exposed to east swell, this SSE direction isn’t the optimum (the guide says optimum is from the east), but with that quality and clean wind, it’s still your best shot.

Thursday 3rd September morning is another good clean window: 6ft SSE at 10 seconds, light cross-off wind, “very good surf conditions” – a solid follow-up for those who can get back out.

From Friday 4th through the weekend, it drops right off. Small 3–4ft SSE swell with onshore and cross-onshore winds and poor conditions. Not worth paddling out. Then Sunday 6th September morning brings a small 5ft ENE swell at only 6 seconds – short period wind swell – but the wind is clean cross-off. It’s a passable session if you’re desperate.

The next real highlight is Tuesday 8th September morning: 7ft NE swell at 8 seconds, combined energy 894 (moderate), with a gentle cross-off SW breeze and clean conditions. It’s “very good” according to the report, so another solid day for experienced surfers. But that short period (8s) means it’s a bit weaker than the earlier standout.

After that, it’s messy again from the 9th to the 10th, with onshore winds and poor conditions. Then on Friday 11th September morning – this is the one to circle. You’ve got a 5ft SSE swell at a very long 12 second period, combined energy 1191 (moderate-strong), clean cross-off wind. The report calls it “excellent surf conditions for experienced surfers”. Friday afternoon holds at 6ft with a 14 second period – that’s very long period groundswell, energy jumping to 1528 (strong-very strong) and still clean, though the wind picks up a little. That afternoon session is also top-tier.

To sum it: the absolute standouts are Wednesday 2nd September morning and Friday 11th September morning and afternoon. The swell sizes are in the 5ft to 7ft range, good groundswell periods, and clean cross-off winds. Forget the weak, choppy days in between. The water temp is 18°C right now, which is about 0.7° cooler than average – nothing wild, just a touch fresh. Spring wetsuit territory.

Rusty.

Read more