Aoshima Harbour Surf Forecast and Surf Report

G’day, it’s Rusty. Let’s cut to it: Aoshima Harbour is going to test your patience over these next couple of weeks. The first week and a half is mostly a bust—cross-onshore winds and messy surf day after day. There’s a bit of size in there, sure, but the wind kills it for paddle surfing. The true standout sits at the very end of the forecast, two weeks out. That’s where you’ll want to keep your eyes peeled, but don’t book your flights yet—long-range stuff can always change.

Starting Wednesday, September 2, it’s stormy with a 5ft southeast swell at 9 seconds, but the northeast wind at 9 mph is onshore, making it marginal at best. By the afternoon, it’s down to 4ft and still poor. Thursday the 3rd sees the swell lift to 8ft by the afternoon, but the wind is cross-onshore at 22 mph—lumpy and ugly. Friday the 4th is a mess: heavy rain, a near-gale cross-onshore wind at 34 mph in the afternoon, and the surf blown out. Saturday the 5th brings a big 15ft east-northeast swell, but with a fresh cross-onshore breeze at 12 mph, it’s choppy and poor. Sunday the 6th and Monday the 7th keep the same story: big swells (up to 13ft), but cross-onshore winds ruin it.

Tuesday, September 8, offers a tiny break—a 8ft east swell at 10 seconds with a light cross-shore breeze from the north-northwest at 6 mph, and the surf is only marginal, but it’s the best in a week. After that, it’s back to poor conditions all the way through Monday the 14th. Onshore winds, lumpy seas, and nothing worth paddling out for.

Then, Tuesday, September 15, is the big one. The morning shows a 16ft east swell with a very long 14-second period, glassy conditions (southwest wind at just 3 mph), and the combined energy is massive at 17185 (very strong). The afternoon pumps up to 20ft east swell, glassy calm with zero wind. This is a beast—too big for Aoshima Harbour unless you’re an expert. The waves will be powerful, long-period groundswell, best left to the guns at reefs and points. Wednesday the 16th still has a 12ft east swell with clean offshore wind in the morning (WSW at 3 mph), but again, expert territory.

Finally, Thursday, September 17, delivers something you can actually surf: a beautiful clean morning with a northwest cross-offshore breeze at 3 mph, 6ft east swell at 10 seconds, and moderate energy (943). Expect very good conditions—clean, lined-up waves. This is your chance if the big stuff on the 15th is too much.

Water temp is about average for this time of year, nothing wild.

Aoshima Harbour can get crowded sometimes, but with this long stretch of poor surf, it’ll be quiet until that mid-September window.

Rusty.

Read more