Surf Forecasts:
Isla Negra surf forecast from 23 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 11PM (local time) - 6.5ft (2.0m), 12s period, WSW swell with cross-offshore winds.
- Most powerful swell: Thursday 27 Aug, 2PM (local time) - 11ft (3.5m), 16s period, WSW swell with 5,163 kJ wave energy.
- Next surfable swell (1★+): Sunday 23 Aug, 8PM (local time) - 1.5ft (0.5m), 9s 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 Sunday (Aug 23) at 8PM. The primary swell is predicted to be 0.5m and 9s period. 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 3.5m 16s and forecast to arrive on Thursday (Aug 27) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 7s period and expected on Saturday (Aug 22) at 11PM.
| Wave Type | Time (-04) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Sun 23rd Aug) | 1.5ft (0.5m) 9s |
| Best Surf | 11PM (Wed 26th Aug) | 6.5ft (2.0m) 12s |
| Most Powerful | 2PM (Thu 27th Aug) | 11ft (3.5m) 16s |
Table - best surf conditions forecast for Isla Negra over the next 16 days.
The Lowdown
Alright, let's have a look at what's on the cards for the next couple of weeks. Honestly, it's a slow start. The first good opportunity we see isn't until Wednesday the 26th, so you're looking at a few days of flat or messy conditions before that.
Alright, the main event and the standout for the whole period is Isla Negra. It's an advanced reef break, so bring your A-game. The first proper pulse hits on Wednesday morning, the 26th of August. We're looking at a solid 5ft of swell coming out of the WSW, and with a 12-second period it's got some proper push. The combined energy is in the moderate range (677), but what makes it a winner is the offshore wind from the south. It'll be clean, with good shape. The water temp is sitting around 56°, which is about normal for this time of year, so just a light spring suit will do. This window holds through the afternoon as well.
Now, things get serious for the real big-wave crew. Thursday the 27th sees a massive jump to 10ft - 12ft, also from the WSW with a very long 15-second period. The combined energy rockets up to a very strong 4473 and 4681. This is proper heavy, expert-only territory. Looks a bit onshore with NW winds, so while it's big, the quality might be a bit lumpy.
If you want the glassy perfection, Thursday the 28th of August is your absolute best bet. It's a proper highlight. The swell drops back to a still sizable 8ft to 8ft from the WSW, still packing a long 13-second period. The combined energy is strong (1945 - 2261), but the reason this stands out is the wind goes completely glassy. Zero wind in the morning, then a slight westerly in the afternoon. This will be an incredible session for experienced surfers. It's going to be clean and lined up perfectly.
The quality holds into the weekend, with Saturday the 29th offering 6ft to 6ft of clean, glassy surf. After that, the second week is less consistent, with a mix of onshore winds and smaller swell, but there's a promising pulse for the first week of September. The 3rd of September shows another excellent window with 4ft to 6ft of clean, cross-offshore swell and strong combined energy (1425 - 1599). The 5th of September also looks excellent with a building 6ft to 8ft swell and clean conditions. This is a spot that turns on when the swell and wind align, and it looks like it will for a few proper sessions.
Stay safe out there.
Rusty
Short Range ForecastMostly dry. Very mild (max 18°C on Sat afternoon, min 11°C on Sun morning). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Wed night. Very mild (max 15°C on Thu afternoon, min 11°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sat 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | ||||||||||||||
PM | 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 10 | WSW 10 | W 9 | W 9 | W 10 | W 9 | WSW 11 | WSW 10 | WSW 15 | WSW 14 | WSW 13 | WSW 12 | WSW 12 | WSW 13 | WSW 15 | WSW 15 | WSW 14 | WSW 13 | WSW 13 | WSW 13 |
Wave Graph  | ||||||||||||||||||||
 kJ | 272 | 179 | 41 | 41 | 49 | 25 | 85 | 82 | 121 | 183 | 232 | 669 | 730 | 1491 | 4473 | 4681 | 3009 | 2253 | 1945 | 1221 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | on | cross-on | glassy | glassy | on | on | on | on | glassy | off | off | cross-off | on | on | cross | glassy | glassy | cross |
High Tide | 7:26PM0.71m | 7:23AM1.14m | 8:18PM0.76m | 8:11AM1.22m | 8:54PM0.82m | 8:50AM1.29m | 9:24PM0.88m | 9:24AM1.35m | 9:53PM0.95m | 9:56AM1.39m | 10:22PM1.01m | 10:27AM1.40m | 10:52PM1.08m | |||||||
Low Tide | 00:29AM0.48m | 2:28PM0.32m | 1:29AM0.42m | 3:05PM0.25m | 2:14AM0.34m | 3:35PM0.18m | 2:53AM0.27m | 4:03PM0.13m | 3:28AM0.21m | 4:30PM0.09m | 4:03AM0.16m | 4:55PM0.07m | 4:39AM0.14m | |||||||
 |  |  |  |  | | | | | |  | |  |  | | | | | | | |
 | — | — | 7:15 | — | — | 7:13 | — | — | 7:13 | — | — | 7:11 | — | — | 7:09 | — | — | 7:09 | — | — |
 | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:23 | — | — | 6:24 | — | — | 6:24 | — | — | 6:25 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 2 | — | — | — | — | — | — |
Temp °C | 18 | 15 | 14 | 14 | 12 | 14 | 14 | 14 | 15 | 14 | 14 | 14 | 13 | 12 | 14 | 15 | 13 | 14 | 14 | 13 |
Feels °C | 15 | 15 | 12 | 13 | 12 | 14 | 12 | 14 | 13 | 11 | 12 | 10 | 8 | 8 | 11 | 12 | 12 | 14 | 13 | 12 |
Swell 1 Height (m) Direction Period (s) | WSW 10 | WSW 10 | SW 7 | SW 7 | W 10 | W 9 | WSW 11 | WSW 10 | WSW 10 | WSW 14 | WSW 13 | WSW 12 | WSW 12 | WSW 13 | WSW 15 | WSW 15 | WSW 14 | WSW 13 | WSW 13 | WSW 13 |
| kJ | 272 | 179 | 53 | 38 | 49 | 25 | 85 | 82 | 74 | 183 | 232 | 669 | 730 | 1491 | 4473 | 4681 | 3009 | 2253 | 1945 | 1221 |
Swell 2 Height (m) Direction Period (s) | SW 12 | SSW 12 | W 9 | W 9 | SW 7 | SW 12 | SW 12 | SW 12 | WSW 15 | WSW 10 | WSW 9 | W 20 | SW 20 | — | — | — | — | NW 15 | — | — |
| kJ | 6 | 13 | 41 | 41 | 21 | 39 | 35 | 69 | 121 | 54 | 76 | 8 | 15 | — | — | — | — | 8 | — | — |
Swell 3 Height (m) Direction Period (s) | SW 16 | W 14 | WSW 12 | WSW 11 | SW 13 | SW 6 | W 9 | WSW 16 | SSW 11 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 10 | 15 | 28 | 24 | 28 | 9 | 14 | 26 | 11 | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | N 3 | NNW 3 | — | — | — | — | — | NNW 3 | N 4 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 1 | 1 | — | — | — | — | — | 4 | 6 | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 1 | 58 | 58 | 0 | 1 | 20 | 1 | 13 | 20 | 0 | 0 | 0 | 0 | 60 | 115 | 1 | 0 | 0 | 1 |
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.
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