Surf Forecasts:
Isla Negra surf forecast from 1 Sep 2026:
- Best quality surf: Friday 4 Sep, 2AM (local time) - 5.5ft (1.7m), 13s period, WSW swell with offshore winds.
- Most powerful swell: Thursday 3 Sep, 5PM (local time) - 6ft (1.9m), 15s period, WSW swell with 1,488 kJ wave energy.
- Next surfable swell (1★+): Tuesday 1 Sep, 2AM (local time) - 3.5ft (1.0m), 11s period with WSW swell.
Best Forecast Surf Conditions for Isla Negra this week:
The surf forecast for Isla Negra over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Sep 01) at 2AM. The primary swell is predicted to be 1.0m and 11s period with a secondary swell of 0.6m and 7s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Isla Negra in the next 16 days are 1.9m 15s and forecast to arrive on Thursday (Sep 03) at 5PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 8s period and expected on Friday (Sep 04) at 8PM.
| Wave Type | Time (-04) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Tue 1st Sep) | 3.5ft (1.0m) 11s |
| Best Surf | 2AM (Fri 4th Sep) | 5.5ft (1.7m) 13s |
| Most Powerful | 5PM (Thu 3rd Sep) | 6ft (1.9m) 15s |
Table - best surf conditions forecast for Isla Negra over the next 16 days.
The Lowdown
Alright, let’s get into it. Rusty here.
First up, we’ve got Isla Negra as the only spot on the menu. It’s a reef break, exposed and picking up what it can. The next couple of weeks look patchy, no doubt about it. There’s a real gap in quality coming up, but we’ll walk through it day by day.
Right now, Tuesday the 1st starts off with a bit of hope. Morning has some waist-high swell hitting around 3 feet from the WSW, with a 10-second period. The wind is cross-off from the south at 9 mph, so it’s clean enough. The energy is moderate (218), and it’s probably worth a look for the advanced crew. Afternoon drops off quick though – down to 2 feet and weak. Not much there.
Wednesday the 2nd is pretty ordinary. Morning has 3 feet and 9-second swell, but the energy is low (92). Afternoon sees a weird spike in period to 18 seconds with 2 feet, giving it moderate energy (245), but the wave state is marginal. That long period with such small height means it’ll be fat and hard to ride.
Thursday the 3rd is a bit more interesting but still tricky. Morning is tiny at 2 feet but with a 16-second period, and the energy is surprisingly strong (677). That long-period groundswell is better suited to a reef like this, but it might be too straight for a proper wave. Afternoon builds to 6 feet with a 15-second period – that’s a solid swell, very strong energy (1488). But the wind is up to 19 mph from the SSW, cross-off and fresh. That’s big and bumpy. For experts only at that size, and the conditions will be rough.
Friday the 4th morning has 3 feet with a 13-second period and moderate energy (592). Wind is 12 mph from the south, still cross-off. Afternoon is a write-off with fresh wind and poor conditions.
Saturday the 5th is a flat spell starting. Morning has a weak 3 feet, 12-second swell (180 energy), and then afternoon goes to zero. From Sunday the 6th through to Tuesday the 8th, it’s almost completely flat. There’s a tiny 0.3 feet on Tuesday afternoon, but that’s nothing.
Wednesday the 9th morning is flat, but the afternoon shows a pulse: 3 feet from the WSW, 13 seconds, light breeze, and good surf conditions with moderate energy (235). That’s a bright spot, but it’s short-lived.
Thursday the 10th to Saturday the 12th is a flat run again. Only tiny 0.3 feet pulses with no energy to speak of. Real quiet.
Sunday the 13th shows some life. Morning has 2 feet, 15-second period, but low energy (180). Afternoon picks up to 4 feet, 14-second period, with moderate energy (421) and a light breeze. That’s a solid afternoon session – clean, manageable, and the reef should make the most of that long period.
Now, Monday the 14th is the standout. Morning has 4 feet from the WSW, 12 seconds, and a light offshore from the NNW at just 3 mph. The energy is strong (695). Afternoon is even better: 4 feet, 13-second period, glassy conditions with a 3 mph west wind. That’s the best of the whole forecast – clean, lined up, proper wave energy (506). Isla Negra will be working well here. Crowds are possible (it’s listed as “sometimes”), so get in early.
Tuesday the 15th has a morning pulse at 3 feet, 12 seconds, good energy (242) with light east wind, so it’s still clean. Afternoon goes glassy but drops to 3 feet – ordinary but surfable.
Wednesday the 16th ends the run with a weak 2 feet, 10-second swell (55 energy). Light wind, but not much to get excited about.
Overall, the best session is Monday the 14th afternoon – that glassy 4-foot groundswell with strong energy is the highlight. Sunday the 13th afternoon is a solid runner-up. Everything else is either flat or marginal. If you’re around, mark that Monday.
Rusty.
Short Range ForecastMostly dry. Very mild (max 17°C on Tue afternoon, min 12°C on Tue night). Winds increasing (calm on Mon night, fresh winds from the SSW by Thu afternoon). | Days 5-7 Weather SummaryMostly dry. Very mild (max 14°C on Fri afternoon, min 9°C on Thu night). Winds decreasing (fresh winds from the SSW on Fri afternoon, light winds from the S by Sun morning). | ||||||||||||||||||
Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | ||||||||||||||
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) | WSW 11 | WSW 10 | WNW 8 | SW 19 | WSW 9 | WSW 18 | WSW 16 | WSW 14 | WSW 15 | WSW 13 | WSW 13 | WSW 13 | WSW 13 | WSW 12 | SW 18 | SW 16 | WSW 11 | SW 14 | SW 14 |
Wave Graph | |||||||||||||||||||
242 | 185 | 37 | 0 | 92 | 204 | 181 | 237 | 1488 | 1018 | 362 | 317 | 202 | 180 | 0 | 0 | 47 | 0 | 0 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | off | cross-off | cross-off | off | cross-off | cross-off | off |
High Tide | 00:30AM1.22m | 12:40PM1.12m | 1:10AM1.23m | 1:22PM0.99m | 1:59AM1.22m | 2:15PM0.86m | 3:01AM1.19m | 3:33PM0.75m | 4:23AM1.19m | 5:25PM0.71m | 5:52AM1.23m | 7:00PM0.76m | |||||||
Low Tide | 6:38AM0.21m | 6:45PM0.18m | 7:29AM0.27m | 7:20PM0.25m | 8:34AM0.34m | 8:04PM0.32m | 10:05AM0.39m | 9:09PM0.39m | 11:50AM0.36m | 10:45PM0.42m | 1:11PM0.26m | 1:17AM0.37m | |||||||
— | 7:03 | — | — | 7:03 | — | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — | — | 7:56 | — | — | |
6:28 | — | 6:29 | — | — | 6:29 | — | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 7:31 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 15 | 17 | 14 | 14 | 14 | 13 | 14 | 13 | 12 | 12 | 14 | 13 | 12 | 12 | 11 | 12 | 13 | 10 |
Feels °C | 13 | 12 | 13 | 12 | 12 | 10 | 10 | 11 | 8 | 7 | 8 | 8 | 9 | 8 | 7 | 7 | 9 | 9 | 7 |
Swell 1 Height (m) Direction Period (s) | WSW 11 | WSW 10 | SW 10 | SW 5 | WSW 9 | WSW 18 | WSW 10 | WSW 9 | — | WSW 13 | WSW 8 | WSW 13 | SW 9 | SW 9 | SW 18 | SW 12 | SW 15 | SW 14 | SW 14 |
242 | 185 | 142 | 28 | 92 | 204 | 146 | 217 | — | 1018 | 230 | 317 | 334 | 210 | 516 | 448 | 550 | 716 | 492 | |
Swell 2 Height (m) Direction Period (s) | WNW 7 | WNW 8 | WNW 8 | SW 10 | SW 6 | W 9 | WSW 16 | WSW 14 | — | — | WSW 13 | SW 24 | WSW 13 | WSW 12 | SW 12 | SW 16 | SW 9 | — | SW 18 |
37 | 33 | 37 | 96 | 26 | 14 | 181 | 223 | — | — | 362 | 22 | 202 | 180 | 144 | 492 | 159 | — | 51 | |
Swell 3 Height (m) Direction Period (s) | SW 19 | SW 18 | SW 18 | SW 19 | SW 18 | WSW 12 | SW 14 | WSW 16 | — | — | — | — | SW 21 | SW 19 | — | — | WSW 11 | — | — |
95 | 83 | 85 | 175 | 157 | 27 | 64 | 237 | — | — | — | — | 116 | 290 | — | — | 47 | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | SW 4 | — | — | SW 9 | SW 5 | — | WSW 15 | — | — | SW 8 | — | — | SW 8 | — | — | — | — |
— | — | 9 | — | — | 172 | 21 | — | 1488 | — | — | 297 | — | — | 256 | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 61 | 60 | 0 | 61 | 0 | 351 | 425 | 0 | 61 | 425 | 0 | 61 | 425 | 6 | 0 | 425 | 6 |
Best forecast wave conditions in Santiago | |||||||||||||||||||
Best forecast wave conditions in Chile | |||||||||||||||||||
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Information about the Isla Negra Surf forecast
The above surf forecast table for Isla Negra provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Isla Negra can be found by selecting the local surf guide option on the grey menu. Our Isla Negra 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 (Isla Negra) 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 Isla Negra 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.
Isla Negra is 19 km (12 miles) from the city of San Antonio. If you plan a holiday in Santiago, look for hotels and other accommodation in San Antonio. San Antonio has rooms for a wide range of budgets as well as car hire and transport links.











