Surf Forecasts:
Isla Negra surf forecast from 7 Sep 2026:
- Best quality surf: Wednesday 9 Sep, 12PM (local time) - 2ft (0.6m), 14s period, WSW swell with cross-offshore winds.
- Most powerful swell: Monday 14 Sep, 3AM (local time) - 3ft (0.9m), 16s period, WSW swell with 436 kJ wave energy.
- Next surfable swell (1★+): Wednesday 9 Sep, 12AM (local time) - 1.5ft (0.4m), 16s 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 09) at 12AM. The primary swell is predicted to be 0.4m and 16s 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 0.9m 16s and forecast to arrive on Monday (Sep 14) at 3AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 10s period and expected on Saturday (Sep 12) at 9PM.
| Wave Type | Time (-04) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Wed 9th Sep) | 1.5ft (0.4m) 16s |
| Best Surf | 12PM (Wed 9th Sep) | 2ft (0.6m) 14s |
| Most Powerful | 3AM (Mon 14th Sep) | 3ft (0.9m) 16s |
Table - best surf conditions forecast for Isla Negra over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s coming up for Isla Negra.
We’re in for a slow start, but there’s a nice little pulse building through the back half of the week and into the weekend. The first few days are pretty much a write-off, so don’t rush to get your wetsuit on just yet. Things start to look up from Friday the 11th, and we’ve got a couple of windows that could be worth a paddle.
The standout session is clearly Friday morning, September 11. Isla Negra is a reef setup, so it needs the right direction, and we’ve got a solid 3ft swell rolling in from the WSW, with a 12-second period that’s got plenty of push. The wave energy is moderate (261), and with the wind glassy from the NE, it’s going to be clean. This is the best on offer—smooth, lined-up waves for the advanced crew. The water temp is about average for this time of year, so no surprises there.
Another good shout is Saturday morning, September 12. The swell bumps up a notch to 4ft, still from the WSW, but the period drops to 8 seconds, so it’s a bit more wind-swell in nature. The energy is still decent (203), and with a light ESE cross-off breeze, it’ll be fun and clean. If you’re looking for a weekend session, this is your window.
Saturday afternoon holds up too, with the same 4ft swell but a longer 10-second period, pushing the energy to 298. It’s a solid option.
After that, the waves get smaller and more inconsistent. Monday morning, September 14 sees a 3ft WSW swell with a very long 15-second period. That’s proper groundswell, and it’ll wrap in nicely at this reef, though the sets will be more spaced out. The energy is strong (498), and the SE offshore wind will keep it glassy. For the advanced guys, this is a quality, if a little more mellow, day.
The following week is patchy. There’s a brief window on Tuesday morning, September 15 with another 3ft WSW swell and a 13-second period, but the wind gets stronger in the afternoons, so morning is the move. After that, it’s mostly small and weak, with swells dropping below 2ft and energy levels in the tens. The gap from around the 16th to the end of the forecast is a long stretch of poor surf—so don’t hold your breath.
Overall, the best bet is Friday morning, September 11, with Saturday morning, September 12 as a close second. Get in before the crowds get word—this spot can get busy.
Rusty.
Short Range ForecastMostly dry. Very mild (max 12°C on Mon afternoon, min 8°C on Mon morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 14°C on Fri afternoon, min 10°C on Thu morning). Wind will be generally light. | ||||||||||||||||||||
Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | |||||||||||||||
AM | 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) | SW 13 | SW 14 | SW 13 | SW 13 | W 13 | WSW 16 | WSW 15 | NW 13 | WSW 13 | NW 12 | NW 12 | NW 11 | NW 11 | NW 12 | NW 12 | WSW 7 | WSW 20 | WSW 20 | WSW 19 | SW 18 | W 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 3 | 102 | 86 | 6 | 219 | 6 | 6 | 5 | 5 | 5 | 6 | 96 | 40 | 76 | 136 | 0 | 37 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross | off | off | cross-on | glassy | cross-off | cross-off | off | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | glassy | cross | glassy | off | cross-off | cross-off |
High Tide | 9:02PM0.86m | 9:04AM1.41m | 9:49PM0.97m | 9:53AM1.48m | 10:29PM1.07m | 10:36AM1.50m | 11:07PM1.17m | 11:17AM1.47m | 11:43PM1.25m | 11:55AM1.39m | 00:18AM1.30m | 12:32PM1.29m | 00:53AM1.31m | ||||||||
Low Tide | 3:08PM0.16m | 2:27AM0.28m | 3:52PM0.07m | 3:23AM0.18m | 4:30PM0.00m | 4:12AM0.10m | 5:05PM-0.03m | 4:57AM0.05m | 5:38PM-0.03m | 5:41AM0.04m | 6:09PM0.01m | 6:24AM0.06m | 6:39PM0.07m | ||||||||
 |  |  | | | | | |  |  | |  | | | | | | | | | | |
 | 7:56 | — | — | 7:54 | — | — | 7:54 | — | — | 7:52 | — | — | 7:50 | — | — | 7:50 | — | — | 7:48 | — | — |
 | — | 7:31 | — | — | 7:32 | — | — | 7:34 | — | — | 7:34 | — | — | 7:35 | — | — | 7:36 | — | — | 7:36 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 11 | 12 | 10 | 10 | 11 | 10 | 11 | 12 | 11 | 12 | 13 | 12 | 13 | 14 | 11 | 11 | 12 | 12 | 12 | 13 | 12 |
Feels °C | 9 | 9 | 8 | 7 | 8 | 9 | 8 | 9 | 9 | 10 | 10 | 9 | 11 | 11 | 8 | 9 | 9 | 11 | 10 | 10 | 9 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 14 | SW 13 | SW 13 | SW 13 | SW 12 | SW 12 | SW 14 | WSW 13 | SW 13 | SW 13 | SW 12 | SW 12 | SW 12 | SW 11 | WSW 7 | WSW 20 | SW 10 | SW 9 | SW 9 | SW 9 |
| kJ | 282 | 447 | 398 | 336 | 277 | 178 | 157 | 293 | 219 | 249 | 253 | 220 | 205 | 195 | 303 | 96 | 40 | 275 | 182 | 135 | 126 |
Swell 2 Height (m) Direction Period (s) | SW 16 | — | — | SW 18 | SW 18 | WSW 16 | WSW 15 | SW 6 | SW 6 | SW 5 | NW 12 | NW 11 | SW 5 | NW 12 | NW 12 | SW 11 | NW 11 | WSW 20 | WSW 19 | SW 18 | SW 16 |
| kJ | 119 | — | — | 80 | 78 | 102 | 86 | 17 | 21 | 23 | 6 | 5 | 11 | 5 | 6 | 115 | 5 | 76 | 136 | 312 | 371 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | W 13 | SW 5 | SW 6 | NW 13 | NW 12 | NW 12 | — | — | NW 11 | SW 20 | SW 18 | SW 17 | SW 16 | SW 15 | SW 13 | SW 13 | W 14 |
| kJ | — | — | — | — | 3 | 6 | 16 | 6 | 6 | 6 | — | — | 5 | 15 | 13 | 11 | 10 | 34 | 7 | 28 | 37 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | SW 5 | SW 5 | — | SW 5 | — | — | SW 10 | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 18 | 31 | — | 6 | — | — | 216 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 425 | 6 | 1 | 425 | 0 | 0 | 425 | 0 | 1 | 425 | 6 | 1 | 289 | 60 | 0 | 310 | 0 | 0 | 425 | 6 |
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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