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Isla Santa Maria Surf Forecast
/ Antofagasta (21 surf breaks) /
Surf Forecasts:
Isla Santa Maria surfForecast / Antofagasta / Chile
12 Day Weather and Surf, issued 2 am Thursday 18 Sep 2025 -04
Best Forecast Surf Conditions for Isla Santa Maria this week:
The surf forecast for Isla Santa Maria over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Sep 18) at 6AM. The primary swell is predicted to be 1.4m and 12s period with a secondary swell of 0.4m and 15s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Isla Santa Maria in the next 12 days are 1.8m 10s and forecast to arrive on Monday (Sep 22) at 6PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 5s period and expected on Saturday (Sep 20) at 12AM.
| Wave Type | Time (-04) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Thu 18th Sep) | 4.5ft (1.4m) 12s |
| Best Surf | 6AM (Thu 18th Sep) | 4.5ft (1.4m) 12s |
| Most Powerful | 6PM (Mon 22nd Sep) | 6ft (1.8m) 10s |
Table - best surf conditions forecast for Isla Santa Maria over the next 12 days.
Short Range Forecast Mostly dry. Very mild (max 15°C on Thu afternoon, min 11°C on Fri night). Wind will be generally light. | Days 3-6 Weather Summary Mostly dry. Very mild (max 15°C on Mon morning, min 12°C on Mon night). Winds decreasing (fresh winds from the S on Sun afternoon, calm by Mon night). | ||||||||||||||||||||
Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | Wednesday 24 | |||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 11 | 11 | 11 | 11 | 10 | 12 | 11 | 11 | 7 | 7 | 8 | 8 | 8 | 9 | 10 | 9 | 9 | 9 | 8 | 8 | 8 |
Wave (?)Graph  | |||||||||||||||||||||
 kJ (?) | 506 | 488 | 263 | 268 | 244 | 448 | 463 | 475 | 205 | 418 | 372 | 464 | 493 | 505 | 501 | 370 | 323 | 300 | 184 | 171 | 142 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross | cross- off | cross | cross | cross- off | cross- off | cross | cross- off | cross | cross | cross- off | cross- off | cross | cross- off | glass | cross | cross- off | glass | cross | glass |
High Tide / height (m) | 8:43PM 0.77 | 8:45AM 1.16 | 9:21PM 0.85 | 9:25AM 1.16 | 9:56PM 0.92 | 10:01AM 1.13 | 10:28PM 0.98 | 10:35AM 1.08 | 10:59PM 1.03 | 11:08AM 1.01 | 11:31PM 1.06 | 11:41AM 0.93 | 12:03AM 1.06 | ||||||||
Low Tide / height (m) | 2:49PM 0.08 | 2:18AM 0.18 | 3:25PM 0.05 | 3:05AM 0.14 | 3:57PM 0.04 | 3:47AM 0.12 | 4:25PM 0.04 | 4:27AM 0.11 | 4:51PM 0.06 | 5:05AM 0.12 | 5:17PM 0.09 | 5:44AM 0.14 | 5:43PM 0.13 | ||||||||
Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | Wednesday 24 | |||||||||||||||
| Sunrise | 7:35 | - | - | 7:35 | - | - | 7:33 | - | - | 7:33 | - | - | 7:31 | - | - | 7:31 | - | - | 7:30 | - | - |
| Sunset | - | 7:37 | - | - | 7:37 | - | - | 7:37 | - | - | 7:37 | - | - | 7:37 | - | - | 7:37 | - | - | 7:38 | - |
 |  |  | | | | | |  | | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 14 | 15 | 13 | 15 | 15 | 12 | 14 | 15 | 14 | 14 | 14 | 13 | 15 | 15 | 13 | 14 | 15 | 14 | 15 | 16 | 13 |
| Feels °C (?) | 11 | 12 | 10 | 14 | 14 | 9 | 10 | 11 | 10 | 10 | 9 | 8 | 13 | 13 | 11 | 12 | 12 | 12 | 13 | 15 | 11 |
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Antofagasta
Continuing clean conditions at Isla Santa Maria (light winds from the SSE at Antofagasta 17 km from Isla Santa Maria). 1.4m 12s groundswell from the SW to make surfable waves.
17 km away, 1 h 33 min ago
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 Santa Maria 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 Santa Maria Surf forecast
The above surf forecast table for Isla Santa Maria provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Isla Santa Maria can be found by selecting the local surf guide option on the grey menu. Our Isla Santa Maria 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 Santa Maria) 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 Santa Maria 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.
Are you planning a holiday in Antofagasta? If you are looking for accommodation near Isla Santa Maria, camping, hotels and holiday cottages in Antofagasta, consider staying in Antofagasta which is 35 km (22 miles) away. Alternatively, find information about places to stay and car hire in Mejillones which is 39 km (24 miles) away
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