UV Index in Castro, Chile

Last updated: May 3, 2025

In Castro, Chile, understanding the UV Index is crucial for protecting your skin and overall health. With its Cfb climate, characterized by cool summers and high humidity, residents and visitors alike can be exposed to harmful UV radiation, especially during peak hours between 10 AM and 3 PM when the UV Index reaches levels of 3. By being aware of the UV levels, you can take proactive steps for sunburn prevention and maintain healthy skin, ensuring that your outdoor activities are both enjoyable and safe. Whether you’re wandering through the picturesque streets or relaxing by the water, keeping an eye on the UV Index will help you stay protected under the sun.

Hourly UV Index in Castro

The UV Index throughout the day reveals a gradual increase in sun intensity, peaking mid-afternoon. Starting at 0 at 07:00, the index rises to 1 by 08:00 and remains moderate at 1 for the following hour. As the sun ascends, the intensity reaches 2 by 10:00, climbing further to 3 at 11:00, sustaining this level until 14:00. After this peak, a gentle decline begins, with the index dropping to 2 at 15:00, and gradually easing back to 1 by 17:00, before retreating to 0 by 18:00. For anyone spending time outdoors, the late morning to early afternoon presents the highest UV exposure; thus, caution and sun protection are highly advisable during these hours.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
Time	UVI	Category	Time to Burn
07:00	0	low	45 min
08:00	1	low	45 min
09:00	1	low	45 min
10:00	2	low	45 min
11:00	3	moderate	30 min
12:00	3	moderate	30 min
13:00	3	moderate	30 min
14:00	3	moderate	30 min
15:00	2	low	45 min
16:00	1	low	45 min
17:00	1	low	45 min
18:00	0	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Castro

Throughout the year, UV exposure significantly fluctuates, with the highest risks occurring from November to February, when the UV Index often reaches 13 and the burn time is a mere 10 minutes. As we transition into March and October, the indices are still notably high at 9 and 8, respectively, with increased burn times of 15 minutes. During the milder months of May and July, the UV Index drops to 3 and 2, indicating moderate to low risk and allowing for longer exposure times of 30 to 45 minutes. Residents and visitors are advised to take extreme precautions in high-risk months by wearing sunscreen, protective clothing, and seeking shade to minimize skin damage. Regular checks of the UV Index are crucial for safe outdoor activities year-round.

Monthly Maximum UV Index for Castro, Chile

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Castro. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.

Data source: Statistical UV Index data for Castro, based on information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

Compare Castro UV Index with Other Chile Cities

The table above highlights how UV exposure in Castro compares to other major locations across Chile. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.

Castro's solar exposure compared to other cities in Chile. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Castro	13	12	9	6	3	2	2	4	6	8	13	13
Santiago UVI	14	12	11	7	5	3	4	6	8	11	12	14
Valparaiso UVI	14	12	11	8	5	4	4	6	8	11	12	14
Vina del Mar UVI	14	12	11	8	5	4	4	6	8	11	12	14
Puente Alto UVI	15	14	12	8	6	4	6	8	11	12	14	15
Antofagasta UVI	15	15	13	10	8	6	7	9	11	14	15	15