Surf Forecasts:
Isla Negra surf forecast from 14 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 2PM (local time) - 5ft (1.6m), 14s period, WSW swell with cross-offshore winds.
- Most powerful swell: Wednesday 19 Aug, 2PM (local time) - 5ft (1.6m), 14s period, WSW swell with 1,072 kJ wave energy.
- Next surfable swell (1★+): Saturday 15 Aug, 11AM (local time) - 5ft (1.6m), 11s period with W 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 Saturday (Aug 15) at 11AM. The primary swell is predicted to be 1.6m and 11s period with a secondary swell of 0.7m and 13s. 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 1.6m 14s and forecast to arrive on Wednesday (Aug 19) at 2PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 12s period and expected on Tuesday (Aug 18) at 11AM.
| Wave Type | Time (-04) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Sat 15th Aug) | 5ft (1.6m) 11s |
| Best Surf | 2PM (Wed 19th Aug) | 5ft (1.6m) 14s |
| Most Powerful | 2PM (Wed 19th Aug) | 5ft (1.6m) 14s |
Table - best surf conditions forecast for Isla Negra over the next 16 days.
The Lowdown
G'day, Rusty here. Lookin' at the forecast for Isla Negra, it’s a bit of a mixed bag over the next couple of weeks, but there are some sessions that will make it all worthwhile.
The good news kicks off fairly quickly. Friday the 15th of August is the standout window. Saturday morning has a beautiful 5ft swell rolling in from the west with an 11-second period, and the wind is dead glassy. Combine that with moderate wave energy (733), and you’ve got clean, punchy waves at this exposed reef. Saturday afternoon holds similar quality with a 5ft west-northwest swell and calm conditions, so you can surf all day. The water temp is about average for this time of year, so no need for a winter suit if you don't want one.
Sunday the 17th and Monday the 18th are still decent, with 3ft to 3ft swell from the west-southwest and glassy or clean conditions, though the energy drops a bit (333 and 290). But then we hit a flat spell: Tuesday the 19th and Wednesday the 20th of August have no surf at all, so it’s a couple of days off.
Things wake up again on Wednesday the 20th of August, but with a catch. A 5ft west-southwest groundswell with a very long 15-second period rolls in, but the wind is a slight cross-onshore, so expect some ripples. However, by Wednesday afternoon the wind swings to a cross-offshore breeze and it goes clean, with the same size and a 14-second period. The combined energy here is strong at 1014, so these will be powerful, well-shaped waves for the reef. This is a great option but be aware that with over 8ft swell it will be strictly for experts.
Thursday the 21st and Friday the 22nd still have some quality, with 5ft west-southwest swell and clean conditions, but the crowds are noted as “sometimes” busy at Isla Negra, so you might have to share. From Saturday the 23rd of August onwards, the wind turns onshore and the size drops, making it messy and unappealing for a couple of days.
The end of the window, from the 27th of August, has some size again – 6ft to 7ft – but it’s all cross-onshore wind and rain, so it’s a washout for paddle surfing. If you’re into the idea of a big, windy beach setup, the waves might be more interesting for kite surfing on those days.
The best bet for the whole period is Saturday the 15th of August. Get it while it’s glassy and clean.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Thu night. Very mild (max 14°C on Fri morning, min 12°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Mon morning. Very mild (max 15°C on Tue afternoon, min 11°C on Mon morning). Wind will be generally light. | ||||||||||||||||||
Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | ||||||||||||||
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 14 | WSW 13 | WNW 10 | WNW 11 | W 11 | WNW 10 | WSW 14 | WSW 13 | W 8 | WSW 14 | WSW 14 | WSW 13 | WSW 12 | SW 12 | SW 15 | WSW 14 | WSW 15 | WSW 14 | WSW 13 |
Wave Graph  | |||||||||||||||||||
 kJ | 264 | 158 | 419 | 631 | 584 | 386 | 264 | 225 | 44 | 264 | 286 | 265 | 480 | 0 | 0 | 515 | 1014 | 886 | 756 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | glassy | glassy | off | off | cross-off | cross-off | cross-off | glassy | cross-off | cross-off | cross-off | glassy | cross-on | cross-off | off |
High Tide | 11:10PM1.11m | 11:20AM1.55m | 11:51PM1.16m | 12:00PM1.45m | 00:31AM1.19m | 12:40PM1.30m | 1:12AM1.19m | 1:19PM1.14m | 1:54AM1.17m | 2:01PM0.98m | 2:41AM1.13m | 2:49PM0.84m | 3:39AM1.08m | ||||||
Low Tide | 4:54AM0.04m | 5:50PM-0.04m | 5:40AM0.07m | 6:25PM0.01m | 6:27AM0.13m | 6:59PM0.09m | 7:16AM0.22m | 7:32PM0.19m | 8:09AM0.33m | 8:07PM0.29m | 9:15AM0.42m | 8:46PM0.39m | |||||||
 |  |  | | | |  | | | | | |  |  | |  | | | | |
 | — | 7:24 | — | — | 7:24 | — | — | 7:22 | — | — | 7:22 | — | — | 7:20 | — | — | 7:20 | — | — |
 | 6:15 | — | 6:16 | — | — | 6:16 | — | — | 6:17 | — | — | 6:19 | — | — | 6:19 | — | — | 6:20 | — |
mm | 1 | 1 | — | 2 | 1 | 1 | — | — | 1 | — | 1 | — | — | — | — | — | — | — | — |
Temp °C | 13 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 14 | 12 | 12 | 13 | 13 | 14 | 15 | 13 | 14 | 14 | 13 |
Feels °C | 10 | 11 | 11 | 12 | 12 | 13 | 12 | 11 | 12 | 9 | 11 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 12 |
Swell 1 Height (m) Direction Period (s) | WSW 14 | WSW 13 | WNW 10 | WNW 11 | W 11 | WNW 10 | W 9 | W 8 | SW 13 | WSW 7 | WSW 14 | WSW 13 | WSW 12 | SW 12 | SW 11 | WSW 14 | WSW 15 | WSW 14 | WSW 13 |
| kJ | 264 | 158 | 419 | 631 | 584 | 386 | 190 | 104 | 234 | 93 | 286 | 265 | 480 | 393 | 347 | 515 | 1014 | 886 | 756 |
Swell 2 Height (m) Direction Period (s) | NW 13 | W 11 | WSW 13 | WSW 13 | WSW 13 | WSW 13 | WSW 14 | WSW 13 | W 8 | WSW 14 | SW 7 | WSW 8 | SW 18 | SW 16 | SW 15 | SW 8 | — | — | — |
| kJ | 7 | 39 | 154 | 151 | 149 | 147 | 264 | 225 | 44 | 264 | 44 | 13 | 82 | 268 | 318 | 64 | — | — | — |
Swell 3 Height (m) Direction Period (s) | S 9 | SW 5 | NW 12 | — | SW 17 | SW 16 | NW 11 | NW 11 | NW 10 | NW 10 | NW 10 | NW 10 | NW 10 | — | — | WSW 11 | — | — | — |
| kJ | 1 | 1 | 6 | — | 70 | 129 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | — | — | 76 | — | — | — |
Wind waves Height (m) Direction Period (s) | NW 6 | NNW 4 | — | — | — | — | — | — | SW 5 | — | — | SW 6 | — | — | — | — | — | — | — |
| kJ | 11 | 10 | — | — | — | — | — | — | 27 | — | — | 18 | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 1 | 13 | 1 | 1 | 0 | 0 | 0 | 0 | 48 | 0 | 0 | 0 | 0 | 6 | 6 | 0 | 21 | 0 | 0 |
Best forecast wave conditions in Santiago | |||||||||||||||||||
Best forecast wave conditions in Chile | |||||||||||||||||||
Header Global | |||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Isla Negra surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest