
Surf Forecasts:
Isla Negra surf forecast from 17 Jul 2026:
- Best quality surf: Sunday 19 Jul, 5AM (local time) - 6ft (1.8m), 12s period, WNW swell with cross-offshore winds.
- Most powerful swell: Friday 17 Jul, 2PM (local time) - 13ft (4.0m), 10s period, NNW swell with 3,313 kJ wave energy.
- Next surfable swell (1★+): Sunday 19 Jul, 5AM (local time) - 6ft (1.8m), 12s period with WNW 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 (Jul 19) at 5AM. The primary swell is predicted to be 1.8m and 12s period. 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 4.0m 10s and forecast to arrive on Friday (Jul 17) at 2PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 9s period and expected on Friday (Jul 17) at 8AM.
| Wave Type | Time (-04) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Sun 19th Jul) | 6ft (1.8m) 12s |
| Best Surf | 5AM (Sun 19th Jul) | 6ft (1.8m) 12s |
| Most Powerful | 2PM (Fri 17th Jul) | 13ft (4.0m) 10s |
Table - best surf conditions forecast for Isla Negra over the next 16 days.
The Lowdown
Alright surfers, Rusty here with the outlook for Isla Negra. This is a reef break, one for the advanced crew only, and it’s a spot that’s very consistent. The optimum swell direction here is from the NNW, and we’ve got a bunch of different swells coming through over the next two weeks.
First up, the water is about average for the time of year, nothing weird going on there. The pattern this week is pretty wild. We are looking at a gap right now with absolutely no surf on offer. The first wave worth paddling for isn’t until Sunday the 19th. So you’ve got a few days of waiting.
Let’s jump into the good stuff. Sunday the 19th is where it turns on. The morning is the standout of the whole forecast. We’ve got a clean 5 ft swell from the WNW with a nice 11-second period, and the wind is glassy. That’s about as good as it gets for conditions. The combined energy is moderate at 634, but it’s going to feel way better than that with that tide and wind combo. If you can get out there Sunday morning, you’re onto a winner.
Monday the 20th holds smaller but still fun, with glassy 4 ft to 3 ft waves from the west, same 11-second period. Still clean as a whistle. Then things get messy. Tuesday the 21st and Wednesday the 22nd are blown out with strong winds and big, junky 10 ft swell. That’s big and ugly. Skip those days.
Things clean up again Thursday the 23rd. It’s a very good session with clean 7 ft swell from the west and a 10-second period. Offshore and cross-offshore winds will have it looking nice. Friday the 24th is tiny and slow, dropping down to 3 ft. Not worth the drive.
Now, for the second week, there’s a real standout lurking. Saturday the 26th afternoon pumps up with a 7 ft swell from the NNW, but the real magic is the 7-second period and clean offshore wind. It’s an excellent session for experienced surfers, with moderate energy (1011). Then Sunday the 27th is a little bigger but with a longer 12-second period from the WSW, giving a solid 6 ft to 7 ft. It’s clean again with cross-offshore winds, but the conditions are a bit more marginal for the tide.
The absolute best of the whole outlook, though, is the end of the month. From Thursday the 30th of July through Friday the 31st and into Saturday the 1st of August, it’s firing. You’ve got a long-period groundswell from the WSW with periods of 12 to 14 seconds, pushing 6 ft to 7 ft. The combined energy is strong, hitting 1637 on Friday morning. The wind is offshore or very light, making for glassy, clean conditions. This is expert territory at over 7 ft, but for the advanced crew, this is the pick of the entire forecast. It’s a bit far out, so keep an eye on it, but it looks promising.
Rusty out.
Short Range ForecastHeavy rain (total 39mm), heaviest during Fri morning. Very mild (max 14°C on Fri morning, min 11°C on Sat night). Winds decreasing (near gales from the N on Fri night, calm by Sun night). | Days 4-6 Weather SummaryHeavy rain (total 40mm), heaviest during Wed afternoon. Very mild (max 15°C on Mon afternoon, min 11°C on Mon morning). Winds increasing (calm on Mon afternoon, near gales from the N by Tue morning). | ||||||||||||||||||||
Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | |||||||||||||||
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) | NNW 9 | NNW 10 | NNW 10 | WNW 9 | WNW 10 | WNW 12 | WNW 11 | WNW 11 | W 11 | W 11 | W 11 | W 11 | NNW 8 | NNW 8 | W 11 | W 12 | W 12 | W 11 | W 10 | W 10 | W 10 |
Wave Graph | |||||||||||||||||||||
2403 | 2676 | 2519 | 508 | 470 | 857 | 634 | 469 | 338 | 298 | 244 | 154 | 1194 | 817 | 1253 | 2460 | 2346 | 1242 | 745 | 563 | 384 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | cross | off | cross-off | on | cross-on | cross-off | cross-on | cross-on | on | cross-on | on | cross-on | cross-on | cross | on | cross-on |
High Tide | 12:27PM1.55m | 1:06AM1.05m | 1:12PM1.42m | 1:55AM1.06m | 1:57PM1.26m | 2:46AM1.07m | 2:44PM1.09m | 3:40AM1.07m | 3:37PM0.94m | 4:40AM1.08m | 4:44PM0.81m | 5:46AM1.10m | 6:08PM0.75m | ||||||||
Low Tide | 7:08PM-0.01m | 6:47AM0.16m | 7:49PM0.06m | 7:42AM0.25m | 8:30PM0.14m | 8:42AM0.34m | 9:12PM0.23m | 9:54AM0.42m | 9:57PM0.31m | 11:17AM0.46m | 10:50PM0.38m | 12:43PM0.44m | 11:50PM0.42m | ||||||||
7:47 | — | — | 7:47 | — | — | 7:46 | — | — | 7:46 | — | — | 7:45 | — | — | 7:45 | — | — | 7:43 | — | — | |
— | 5:58 | — | — | 5:59 | — | — | 5:59 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | |
mm | 20 | 5 | 10 | 3 | 1 | — | — | — | — | — | — | 5 | 7 | 6 | 1 | 1 | 12 | 8 | 1 | — | 2 |
Temp °C | 14 | 14 | 14 | 13 | 14 | 13 | 13 | 14 | 12 | 12 | 15 | 14 | 13 | 14 | 13 | 14 | 13 | 13 | 14 | 15 | 14 |
Feels °C | 6 | 5 | 6 | 10 | 10 | 10 | 11 | 12 | 11 | 9 | 13 | 11 | 3 | 5 | 9 | 9 | 9 | 8 | 12 | 13 | 12 |
Swell 1 Height (m) Direction Period (s) | WNW 10 | SW 13 | SW 13 | WNW 9 | WNW 10 | WNW 12 | WNW 11 | WNW 11 | W 11 | W 11 | W 11 | W 11 | W 11 | W 10 | W 11 | W 12 | W 12 | W 11 | W 10 | W 10 | W 10 |
342 | 142 | 134 | 508 | 470 | 857 | 634 | 469 | 338 | 298 | 244 | 154 | 61 | 56 | 1253 | 2460 | 2346 | 1242 | 745 | 563 | 384 | |
Swell 2 Height (m) Direction Period (s) | SW 9 | SW 8 | WSW 14 | SW 12 | SW 12 | N 7 | SSW 11 | SSW 11 | SW 11 | N 8 | N 8 | SW 10 | SW 10 | SSW 10 | SW 10 | SW 24 | WSW 22 | WSW 21 | WSW 20 | WSW 19 | WSW 18 |
83 | 25 | 20 | 154 | 114 | 39 | 81 | 85 | 59 | 48 | 64 | 27 | 16 | 10 | 4 | 22 | 47 | 44 | 37 | 36 | 30 | |
Swell 3 Height (m) Direction Period (s) | SW 14 | WSW 15 | — | W 13 | W 12 | SSW 12 | — | — | NW 11 | SW 11 | SW 11 | W 20 | W 22 | W 22 | SW 26 | — | W 21 | W 21 | SSW 11 | SW 10 | SSW 10 |
158 | 21 | — | 90 | 76 | 88 | — | — | 5 | 58 | 57 | 8 | 9 | 9 | 26 | — | 9 | 33 | 11 | 4 | 10 | |
Wind waves Height (m) Direction Period (s) | NNW 9 | NNW 10 | NNW 10 | N 9 | N 8 | — | — | — | — | — | — | NNW 8 | NNW 8 | NNW 8 | N 7 | — | — | — | — | — | — |
2403 | 2676 | 2519 | 257 | 161 | — | — | — | — | — | — | 127 | 1194 | 817 | 189 | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 115 | 289 | 495 | 425 | 97 | 0 | 0 | 0 | 0 | 0 | 0 | 376 | 376 | 97 | 97 | 376 | 189 | 1 | 0 | 0 |
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.










