Isla Negra Surf Break

Lat Long: 33.45° S 71.68° W

Isla Negra Surf Forecast and Surf Report

Issued: 2 am 16 Sep 2026 (local time)

Forecast update in  hr  min

Today's Isla Negra sea temperature is
14.0°C
0.9° 

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 16 Sep 2026:

  • Best quality surf: Sunday 20 Sep, 9PM (local time) - 5ft (1.6m), 10s period, WSW swell with cross-offshore winds.
  • Most powerful swell: Sunday 20 Sep, 9PM (local time) - 5ft (1.6m), 10s period, WSW swell with 540 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 16 Sep, 12PM (local time) - 2ft (0.6m), 12s 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 Wednesday (Sep 16) at 12PM. The primary swell is predicted to be 0.6m and 12s period with a secondary swell of 0.6m and 6s. 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 1.6m 10s and forecast to arrive on Sunday (Sep 20) at 9PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 12s period and expected on Monday (Sep 21) at 3PM.

Wave TypeTime (-04) & Date Wave Height & Period
Next good surf (1 star+)12PM (Wed 16th Sep)2ft (0.6m) 12s
Best Surf 9PM (Sun 20th Sep)5ft (1.6m) 10s
Most Powerful 9PM (Sun 20th Sep)5ft (1.6m) 10s

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


The Lowdown

G’day, Rusty here. Look, it’s been a slow old start for Isla Negra. The first few days are pretty lackluster, with only tiny, weak waves and ordinary conditions. We’ve got to wait through a dead patch until the end of the week before anything really starts to happen.

Wednesday the 24th is where the story changes though. The combined energy from the swells jumps right up to (907), pushing in a solid *6ft* swell from the west at 11 seconds. That’s a proper step up in energy. There’s a bit of light rain around and a gentle cross-shore breeze, so it’s not going to be perfect, but the size is there. It’s going to be too much for most beginners, and the crowds at Isla Negra are *sometimes* an issue anyway. For experienced surfers, this one has some grunt.

Thursday the 25th might be the real standout of the whole run though. The swell holds near *6ft* from the west, with the period stretching out to 13 seconds – that’s a nice, long groundswell. The energy gets very strong, hitting (1230). It’s a reef break, so that long period will really draw into the point. The wind is a bit cross-onshore from the north, and the combined energy is so high (noted 5 digits) that it’s a lot of power. Still, that’s the day with the most potential; it will be proper, powerful stuff for the experts.

After that peak, the swell slowly drops back through the 26th and 27th with cleaner, smaller surf, then fades right out into flat, poor conditions by the end of the month. The end of the month sees the combined energy barely register a 2, so really, it’s a story of one big push mid-week.

Keep in mind, most of the good days have a slight cross-off or cross-on element to the wind, not the glassy perfection we’d dream of. But that Thursday morning on the 25th, for a thick, long-period west swell at Isla Negra – that’s the one to circle.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 20°C on Fri afternoon, min 12°C on Fri morning). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Very mild (max 17°C on Sat morning, min 12°C on Sun night). Wind will be generally light.

Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
20
Monday
21
Tuesday
22
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
1
1
1
2
2
1
1
1
1
0
1
2
2
2
0
1
1
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.4
WSW
10
0.6
WSW
12
0.4
WSW
11
0.4
WSW
14
0.8
WSW
13
1.1
WSW
12
0.9
WSW
11
0.9
WSW
11
0.9
WSW
10
0.9
WSW
10
1
WSW
10
1.2
WSW
12
1
WSW
11
1
WSW
10
1.6
WSW
10
1.2
W
10
0.8
W
9
0.9
W
10
0.9
W
9
0.8
W
10
0.6
W
9
Wave Graph
Metric surfscale
Energy kJ
32
93
46
62
195
322
173
167
158
157
220
353
218
218
473
290
101
158
142
115
60
Wind (km/h)
10
S
15
SSW
15
S
5
SSE
10
W
5
ENE
10
SSW
10
SW
10
SE
5
NNE
5
NW
15
NNW
5
NNW
0
ENE
10
S
10
SSE
25
SW
10
SSE
10
SSW
15
SSW
15
SSE
Wind State
off
cross-off
cross-off
off
cross-on
glassy
cross-off
cross-off
cross-off
glassy
on
on
on
glassy
off
off
cross-off
off
cross-off
cross-off
off
High Tide
2:25PM0.89m
2:50AM1.17m
3:13PM0.77m
3:44AM1.09m
4:28PM0.68m
5:02AM1.04m
6:38PM0.66m
6:34AM1.04m
8:10PM0.71m
7:46AM1.10m
8:53PM0.78m
8:35AM1.17m
9:24PM0.86m
Low Tide
8:08PM0.34m
9:41AM0.39m
8:43PM0.43m
11:08AM0.45m
9:37PM0.51m
12:55PM0.45m
11:22PM0.55m
2:09PM0.38m
1:01AM0.52m
2:53PM0.31m
2:04AM0.45m
3:26PM0.24m
2:49AM0.36m
part cloud
part cloud
clear
clear
part cloud
part cloud
part cloud
clear
clear
clear
cloud
cloud
cloud
part cloud
part cloud
clear
clear
part cloud
cloud
cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:45
7:43
7:41
7:39
7:39
7:37
7:35
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:37
7:38
7:39
7:39
7:40
7:42
7:42
 mm
Temp °C
16
15
15
17
16
14
16
20
15
17
15
14
15
16
16
15
15
14
16
16
16
Feels °C
15
13
13
15
15
15
15
19
14
15
14
12
14
15
14
11
11
12
14
13
15
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  • 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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