Isla Negra Surf Break

Lat Long: 33.45° S 71.68° W

Isla Negra Surf Forecast and Surf Report

Issued: 1 am 17 Jul 2026 (local time)

Forecast update in  hr  min

Today's Isla Negra sea temperature is
12.0° C
1.3° 

Isla Negra surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Isla Negra surf forecast from 17 Jul 2026:

  • Best quality surf: Sunday 19 Jul, 5AM (local time) - 6ft (1.8m), 12s period, WNW swell with cross-offshore winds.
  • Most powerful swell: Friday 17 Jul, 2PM (local time) - 13ft (4.0m), 10s period, NNW swell with 3,313 kJ wave energy.
  • Next surfable swell (1★+): Sunday 19 Jul, 5AM (local time) - 6ft (1.8m), 12s period with WNW 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 Sunday (Jul 19) at 5AM. The primary swell is predicted to be 1.8m and 12s period. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Isla Negra in the next 16 days are 4.0m 10s and forecast to arrive on Friday (Jul 17) at 2PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 9s period and expected on Friday (Jul 17) at 8AM.

Wave TypeTime (-04) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Sun 19th Jul)6ft (1.8m) 12s
Best Surf 5AM (Sun 19th Jul)6ft (1.8m) 12s
Most Powerful 2PM (Fri 17th Jul)13ft (4.0m) 10s

Table - best surf conditions forecast for Isla Negra over the next 16 days.


The Lowdown

Alright surfers, Rusty here with the outlook for Isla Negra. This is a reef break, one for the advanced crew only, and it’s a spot that’s very consistent. The optimum swell direction here is from the NNW, and we’ve got a bunch of different swells coming through over the next two weeks.

First up, the water is about average for the time of year, nothing weird going on there. The pattern this week is pretty wild. We are looking at a gap right now with absolutely no surf on offer. The first wave worth paddling for isn’t until Sunday the 19th. So you’ve got a few days of waiting.

Let’s jump into the good stuff. Sunday the 19th is where it turns on. The morning is the standout of the whole forecast. We’ve got a clean 5 ft swell from the WNW with a nice 11-second period, and the wind is glassy. That’s about as good as it gets for conditions. The combined energy is moderate at 634, but it’s going to feel way better than that with that tide and wind combo. If you can get out there Sunday morning, you’re onto a winner.

Monday the 20th holds smaller but still fun, with glassy 4 ft to 3 ft waves from the west, same 11-second period. Still clean as a whistle. Then things get messy. Tuesday the 21st and Wednesday the 22nd are blown out with strong winds and big, junky 10 ft swell. That’s big and ugly. Skip those days.

Things clean up again Thursday the 23rd. It’s a very good session with clean 7 ft swell from the west and a 10-second period. Offshore and cross-offshore winds will have it looking nice. Friday the 24th is tiny and slow, dropping down to 3 ft. Not worth the drive.

Now, for the second week, there’s a real standout lurking. Saturday the 26th afternoon pumps up with a 7 ft swell from the NNW, but the real magic is the 7-second period and clean offshore wind. It’s an excellent session for experienced surfers, with moderate energy (1011). Then Sunday the 27th is a little bigger but with a longer 12-second period from the WSW, giving a solid 6 ft to 7 ft. It’s clean again with cross-offshore winds, but the conditions are a bit more marginal for the tide.

The absolute best of the whole outlook, though, is the end of the month. From Thursday the 30th of July through Friday the 31st and into Saturday the 1st of August, it’s firing. You’ve got a long-period groundswell from the WSW with periods of 12 to 14 seconds, pushing 6 ft to 7 ft. The combined energy is strong, hitting 1637 on Friday morning. The wind is offshore or very light, making for glassy, clean conditions. This is expert territory at over 7 ft, but for the advanced crew, this is the pick of the entire forecast. It’s a bit far out, so keep an eye on it, but it looks promising.

Rusty out.

Short Range Forecast

Heavy rain (total 39mm), heaviest during Fri morning. Very mild (max 14°C on Fri morning, min 11°C on Sat night). Winds decreasing (near gales from the N on Fri night, calm by Sun night).

Days 4-6 Weather Summary

Heavy rain (total 40mm), heaviest during Wed afternoon. Very mild (max 15°C on Mon afternoon, min 11°C on Mon morning). Winds increasing (calm on Mon afternoon, near gales from the N by Tue morning).

Friday
17
Saturday
18
Sunday
19
Monday
20
Tuesday
21
Wednesday
22
Thursday
23
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
2
3
2
0
0
2
0
0
0
0
0
0
1
2
2
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
4
NNW
9
4
NNW
10
3.5
NNW
10
1.7
WNW
9
1.6
WNW
10
1.8
WNW
12
1.6
WNW
11
1.4
WNW
11
1.2
W
11
1.1
W
11
1
W
11
0.8
W
11
3
NNW
8
2.5
NNW
8
2.3
W
11
3
W
12
3
W
12
2.3
W
11
1.9
W
10
1.7
W
10
1.4
W
10
Wave Graph
Metric surfscale
Energy kJ
2403
2676
2519
508
470
857
634
469
338
298
244
154
1194
817
1253
2460
2346
1242
745
563
384
Wind (km/h)
50
N
40
NNW
35
NNW
20
N
20
N
10
ENE
10
SE
10
SSW
10
NNW
15
NNE
10
ESE
20
NE
45
N
35
N
20
NNE
30
N
25
N
20
NNE
10
ENE
10
NNW
10
NNE
Wind State
on
on
on
on
on
cross
off
cross-off
on
cross-on
cross-off
cross-on
cross-on
on
cross-on
on
cross-on
cross-on
cross
on
cross-on
High Tide
12:27PM1.55m
1:06AM1.05m
1:12PM1.42m
1:55AM1.06m
1:57PM1.26m
2:46AM1.07m
2:44PM1.09m
3:40AM1.07m
3:37PM0.94m
4:40AM1.08m
4:44PM0.81m
5:46AM1.10m
6:08PM0.75m
Low Tide
7:08PM-0.01m
6:47AM0.16m
7:49PM0.06m
7:42AM0.25m
8:30PM0.14m
8:42AM0.34m
9:12PM0.23m
9:54AM0.42m
9:57PM0.31m
11:17AM0.46m
10:50PM0.38m
12:43PM0.44m
11:50PM0.42m
heavy rain
light rain
rain showers
rain showers
rain showers
clear
part cloud
cloud
cloud
part cloud
part cloud
light rain
mod rain
thunderstorm
rain showers
light rain
heavy rain
mod rain
light rain
cloud
light rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:47
7:47
7:46
7:46
7:45
7:45
7:43
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:58
5:59
5:59
6:00
6:00
6:00
6:01
 mm
20
5
10
3
1
5
7
6
1
1
12
8
1
2
Temp °C
14
14
14
13
14
13
13
14
12
12
15
14
13
14
13
14
13
13
14
15
14
Feels °C
6
5
6
10
10
10
11
12
11
9
13
11
3
5
9
9
9
8
12
13
12
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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.

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