UV Index in Costa Rica, Mexico

Last updated: July 2, 2025

In Costa Rica and Mexico, awareness of the UV Index is crucial for protecting your skin against harmful ultraviolet radiation. Understanding UV levels can help you effectively prevent sunburn and maintain long-term skin health, especially in regions where intense sunlight is prevalent. Given Costa Rica's tropical climate, the UV Index can peak dramatically, reaching levels as high as 15 during midday hours—making it vital for residents and visitors alike to take precautions when the sun is at its strongest. By staying informed about the UV Index, you can enjoy the beautiful, sun-soaked landscapes while keeping your skin safe from potential damage.

Hourly UV Index in Costa Rica

As the sun rises, the UV Index gradually climbs, starting at a low of 1 at 07:00. By 09:00, it reaches 3, signaling the need for some sun protection. The intensity peaks dramatically at 12:00, hitting an impressive 14 as the sun is at its strongest. This trend continues, with a maximum of 15 at 13:00, making midday the prime time for UV exposure. However, the numbers start to drop after 14:00, with the index winding down to 4 by 17:00, and finally settling back to 1 by 19:00. Remember, during those peak hours, it's essential to stay protected to ensure your skin stays safe while basking in the summer sun!

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	1	low	45 min
08:00	1	low	45 min
09:00	3	moderate	30 min
10:00	7	high	25 min
11:00	10	very high	15 min
12:00	14	extreme	10 min
13:00	15	extreme	10 min
14:00	14	extreme	10 min
15:00	11	extreme	10 min
16:00	7	high	25 min
17:00	4	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Costa Rica

During the year, the UV Index experiences significant seasonal changes, with the highest readings occurring from March to October, marking a period of extreme exposure. The high-risk months are particularly concentrated from April to July, where the UV Index peaks at 15. Visitors and residents are strongly advised to take precautions during these months, such as wearing protective clothing, applying broad-spectrum sunscreen, and seeking shade whenever possible, especially during the peak sun hours. While UV levels drop notably in December to a level classified as very high, it’s essential to remain cautious year-round, as even lower indices can still pose health risks. Always stay informed and prioritize skin protection to mitigate the harmful effects of UV radiation.

Monthly Maximum UV Index for Costa Rica, Mexico

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

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

Costa Rica's solar exposure compared to other cities in Mexico. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Guadalajara UVI	9	11	14	14	14	13	13	13	13	12	9	8
Iztapalapa UVI	10	12	14	15	14	14	14	14	14	12	10	8
Ecatepec de Morelos UVI	10	12	14	15	15	14	14	13	14	12	10	8
Mexico City UVI	10	12	14	15	15	14	14	13	14	12	10	8
Puebla UVI	10	12	14	15	15	15	15	14	14	13	10	9
Costa Rica	11	13	14	15	14	14	15	14	14	13	11	9