UV Index in San Marcos, Costa Rica

Last updated: May 3, 2025

In San Marcos, Costa Rica, being aware of the UV Index is crucial for safeguarding your skin against harmful sun exposure. With the region's tropical climate, UV levels can escalate quickly, peaking at an alarming 15 between 11:00 AM and 12:00 PM. Understanding these levels not only helps prevent painful sunburns but also plays a vital role in maintaining long-term skin health. As you enjoy the beautiful surroundings, remember that protecting yourself from UV radiation is essential, especially during those intense midday hours when risks are highest. Stay informed and enjoy the sun safely!

Hourly UV Index in San Marcos

The UV Index for the day follows a distinctive pattern, peaking dramatically throughout the late morning to early afternoon. Starting at a mild 2 at 07:00, the index swiftly climbs to reach a robust 15 by 12:00. This prime UV exposure persists until 13:00 before gradually tapering off. By 15:00, the index dips back to a manageable 5, and as the sun sets, it decreases further, dropping to zero by 19:00. This data underscores the importance of sun protection during the peak hours, particularly between 10:00 and 13:00, when the UV Index is at its highest. Be cautious and enjoy the sun safely!

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	2	low	45 min
08:00	5	moderate	30 min
09:00	9	very high	15 min
10:00	13	extreme	10 min
11:00	15	extreme	10 min
12:00	15	extreme	10 min
13:00	13	extreme	10 min
14:00	9	very high	15 min
15:00	5	moderate	30 min
16:00	2	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 San Marcos

Throughout the year, UV levels remain consistently high, with an extreme exposure category noted across all months. The highest UV Index values occur from March to May, peaking at 16 in April, making this spring period particularly risky for sun exposure. Visitors and residents should be aware that the burn time remains a swift 10 minutes throughout the year, regardless of month. Therefore, it is crucial to take protective measures such as wearing sunscreen, protective clothing, and seeking shade, especially during the peak UV months from March to May. Stay vigilant and prioritize sun safety to minimize the risk of harmful UV exposure.

Monthly Maximum UV Index for San Marcos, Costa Rica

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in San Marcos. 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 San Marcos, 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 San Marcos UV Index with Other Costa Rica Cities

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

San Marcos's solar exposure compared to other cities in Costa Rica. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Limon UVI	12	13	14	15	14	13	13	13	13	14	11	10
Liberia UVI	11	13	14	14	14	14	14	13	13	13	11	10
Alajuela UVI	12	13	15	15	14	14	14	13	13	14	12	10
San Jose UVI	12	14	15	16	14	14	14	14	14	15	12	11
San Marcos	12	14	15	16	15	14	15	14	14	14	12	11
Paraiso UVI	13	14	16	16	15	15	15	14	14	15	12	11