UV Index in Saint John's, Antigua and Barbuda

Last updated: May 3, 2025

In Saint John's, Antigua and Barbuda, awareness of the UV Index is crucial for protecting your skin and overall health. Understanding UV levels allows residents and visitors to take essential precautions against sunburn and long-term skin damage, especially during the peak hours of sun exposure. With a tropical climate characterized by high levels of ultraviolet radiation, particularly between 10 AM and 2 PM, it's vital to stay informed about daily UV readings. For instance, a maximum UV Index of 13 at noon indicates an extreme risk of harm from unprotected sun exposure, underscoring the need for diligent sun protection measures.

Hourly UV Index in Saint John's

As the sun rises, so does the UV Index, starting gently at 1 at 07:00. By 08:00, it climbs to 3, but the real intensity begins at 09:00 with a sharp increase to 7. The peak of the day arrives at 12:00, reaching a scorching 13, before slightly tapering off through the afternoon. Notably, 11:00 hits 12, making peak sun hours critical for sun safety. As the day progresses, the index drops to 6 by 15:00, tapering gently back to 1 by 17:00, and reaching virtually zero as evening falls at 19:00. This data highlights the importance of sun protection during those midday hours, especially between 10:00 and 14:00 when the UV levels are at their highest. Stay safe and enjoy the sunshine wisely!

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	3	moderate	30 min
09:00	7	high	25 min
10:00	10	very high	15 min
11:00	12	extreme	10 min
12:00	13	extreme	10 min
13:00	12	extreme	10 min
14:00	10	very high	15 min
15:00	6	high	25 min
16:00	3	moderate	30 min
17:00	1	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Saint John's

During the year, the UV Index experiences significant fluctuations, with extreme levels prevalent from February through October. The highest risk months are March and July, where the UV Index peaks at 13 and 14, respectively, necessitating cautious sun exposure practices. For residents and visitors, it's crucial to stay informed about daily UV levels, especially during these high-risk months, and to adopt protective measures such as wearing sunscreen, hats, and UV-blocking clothing. Remember, even on cloudy days, UV rays can penetrate clouds; thus, it’s vital to remain vigilant throughout the year as burn times range from 10 to 15 minutes depending on the month.

Monthly Maximum UV Index for Saint John's, Antigua and Barbuda

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Saint John's. 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 Saint John's, 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 Saint John's UV Index with Other Antigua and Barbuda Cities

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

Saint John's's solar exposure compared to other cities in Antigua and Barbuda. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Saint John's	9	11	13	13	13	13	14	13	13	12	9	9
Bolands UVI	9	11	13	13	13	13	14	13	13	12	9	9
Liberta UVI	9	11	13	13	13	13	14	13	13	12	9	9
Piggotts UVI	9	11	13	13	13	13	14	13	13	12	9	9
All Saints UVI	9	11	13	13	13	13	14	13	13	12	9	9