UV Index in Saint John's, Antigua and Barbuda

Last updated: June 2, 2025

Understanding the UV Index in Saint John's, Antigua and Barbuda is crucial for safeguarding your skin health against harmful ultraviolet radiation. With the region's tropical climate, where sun intensity peaks during midday hours, being aware of UV levels helps in preventing sunburn and reducing long-term skin damage. The UV Index can reach significant highs—up to 13 in peak hours—indicating an urgent need for protective measures. By taking note of these levels, residents and visitors alike can enjoy the breathtaking Caribbean sunshine while prioritizing their well-being.

Hourly UV Index in Saint John's

As the day unfolds, the UV Index rises dramatically, peaking at 13 around 12:00 PM, signaling a maximum level of sun intensity. Early morning hours start off mild, with a low of 1 at 07:00 and climbing steadily to 6 by 09:00. The sun reaches its zenith at 11:00, with a value of 12, before gradually declining through the afternoon. By 15:00, the index drops to 6, further falling to 3 by 16:00 and finally returning to a safe 1 by 17:00. As twilight approaches, the index settles to 0 after 19:00, providing a serene close to the day. Remember to protect your skin during the peak hours from 10 AM to 2 PM, when the sun's rays are most potent!

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	6	high	25 min
10:00	9	very high	15 min
11:00	12	extreme	10 min
12:00	13	extreme	10 min
13:00	12	extreme	10 min
14:00	9	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