Isla Negra surfForecast / Santiago / Chile

information circle12 Day Weather and Surf, issued 8 pm Thursday 18 Dec 2025 -04
Forecast update in hr  min  s Forecast update imminent
Isla Negra surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Isla Negra sea temperature is
14.0° C
(Which is 2.1°C colder than average for this time of year)


Best Forecast Surf Conditions for Isla Negra this week:

The surf forecast for Isla Negra over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Dec 19) at 12AM. The primary swell is predicted to be 0.5m and 17s period. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Isla Negra in the next 12 days are 0.8m 16s and forecast to arrive on Saturday (Dec 20) at 9AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 9s period and expected on Wednesday (Dec 24) at 6PM.

Wave TypeTime (-04) & Date Wave Height & Period
Next good surf (1 star+)12AM (Fri 19th Dec)1.5ft (0.5m) 17s
Best Surf 3AM (Fri 19th Dec)2ft (0.6m) 17s
Most Powerful 9AM (Sat 20th Dec)2.5ft (0.8m) 16s

Table - best surf conditions forecast for Isla Negra over the next 12 days.

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Mostly dry. Very mild (max 18°C on Sun morning, min 14°C on Thu night). Wind will be generally light.

Days 3-6 Weather Summary Mostly dry. Very mild (max 19°C on Wed morning, min 13°C on Mon night). Mainly fresh winds.

Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thu
25
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
1
2
0
1
2
0
2
2
0
2
2
0
0
1
0
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.5
NW
0.6
WNW
0.5
NW
0.6
WNW
0.8
WNW
0.7
NW
0.6
NW
0.7
NW
0.7
NW
0.7
NW
1.3
WSW
0.5
NW
0.5
NW
0.5
NW
0.4
NW
0.4
NW
0.3
NW
0.2
WNW
0.2
WNW
0.2
WNW
0.2
WNW
Period(s) (?)17171616161615141414813131313121216161616
Wave
Graph
(?)Metric surfscale
Energy kJ (?)14720213216931824817121421120319787858443402326252524
Wind
(km/h)
5
SSW
5
SW
15
W
5
ESE
5
NNW
15
WNW
5
E
5
SSE
20
WSW
10
SSW
15
S
25
SW
20
SSW
10
S
25
SW
20
SSW
10
S
30
SW
15
S
10
NNW
25
NW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
glasscross-
off
crossglassglasscross-
on
glassglasscrosscross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
onon
High Tide
/ height (m)
10:38PM
1.36
11:11AM
0.86
11:14PM
1.39
11:48AM
0.86
11:51PM
1.41
12:24PM
0.85
12:28AM
1.41
1:01PM
0.83
1:04AM
1.39
1:39PM
0.82
1:40AM
1.35
2:20PM
0.82
2:16AM
1.30
3:06PM
0.83
Low Tide
/ height (m)
5:26AM
0.18
4:35PM
0.28
6:04AM
0.16
5:11PM
0.26
6:41AM
0.15
5:46PM
0.26
7:19AM
0.16
6:21PM
0.27
7:56AM
0.17
6:57PM
0.29
8:34AM
0.18
7:36PM
0.33
9:11AM
0.20
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thu
25
Sunrise-6:31--6:31--6:33--6:33--6:33--6:33--6:35-
Sunset--8:53--8:54--8:54--8:55--8:55--8:57--8:57
clear
clear
clear
clear
part cloud
clear
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
Rain (mm)
---------------------
Temp. °C161717161717161818161716141818151918161919
Feels °C (?)171615161515171615161412101414111513141616
  • 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 12 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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