Isla Negra Surf Forecast and Surf Report

Alright folks, Rusty here, checking in from the coast. We've got a 16-day outlook for Isla Negra, and it's a bit of a mixed bag. The good news is we've got some solid swell windows, but you'll need to pick your moments and be patient through some flat spells.

The overall pattern looks like a slow start, then a real pulse of energy building into the second week. The water temperature is sitting at about 57°F, which is pretty normal for this time of year, so nothing to write home about there.

First up, Friday morning, August 7th, we see a small, weak swell on offer with a combined energy of 154 (moderate). The swell is 4ft from the WSW with a short 8-second period, and a cross-offshore breeze. It's surfable but nothing to get excited about. Conditions are just ordinary.

We then hit a real flat patch. From Saturday the 8th through to Monday the 10th, it’s a write-off with zero surfable energy. The combined energy is 0. You could be sitting on a boat.

We finally get a little pulse early on Tuesday the 11th, with tiny 1.0ft groundswell from the WSW carrying a very long 15-second period. The combined energy is only 42 so it's weak, but a 15-second period is a classic groundswell. This is best suited for a reef like Isla Negra, but the size is tiny. It might just be a knee-slapper.

Wednesday the 12th sees a slight improvement. The morning has a clean 1ft, 13-second period swell with light offshore winds. The combined energy is still low at 84. The afternoon gets a bit more interesting: 2ft from the WSW with a long 18-second period, and combined energy jumping to 371 (moderate). That’s a better sign.

Now we’re talking. The first true standout comes on Thursday, August 13th. The morning session is the pick: a solid 4ft swell from the WSW with a 16-second period (classic groundswell) and a light cross-offshore breeze. The combined energy is a very healthy 618 (moderate to strong). This should deliver some really nice, shapely waves for intermediate and advanced surfers. The afternoon cleans up with an offshore breeze, but the swell dips slightly to 3ft.

After that, it’s back to small and ordinary through the weekend (14th & 15th), with onshore winds spoiling the surf on the 15th. The 16th of August offers a decent clean 4ft from the W with offshore winds and 259 of combined energy, which is a solid option.

But the real heavy hitters are in the second week. The best on offer is Monday, August 17th. The morning brings a 6ft WSW swell with a 12-second period and light offshore winds. The combined energy is 1004 (strong), meaning serious power. This is excellent surf, but at that size, it's an intermediate-to-expert only session.

Tuesday the 18th holds well with 4ft to 5ft and combined energy up to a massive 1008 in the afternoon. It’s consistent and clean. Then Wednesday, August 19th is an absolute peak: the morning session sees a 7ft groundswell from the WSW with a 13-second period and offshore winds. The combined energy is massive at 1405. This is powerful, serious surf. At 7ft with that kind of energy, it’s an expert-only window. The afternoon remains excellent for experienced surfers with 6ft and 1036 of energy.

Things start to taper off from the 20th with smaller but still very good surf through to the 22nd. The Saturday, August 22nd has a 5ft swell from the WSW with a 9-second period and 415 of combined energy, offering a fun, punchy option for the weekend.

The true standout: If you have one day to paddle out, make it Thursday morning, August 13th. The 4ft of clean, long-period groundswell with that light offshore breeze will make for some beautiful, lined-up waves at Isla Negra. A close second is Monday, August 17th for the power surfers. The 7ft day on the 19th is huge, but that's for the chargers.

Don't ask about the flat days in between—just plan around them. Forecasts for the second week aren't as locked in, but the potential is huge.

Rusty.

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