UV Index in Georgetown, Saint Helena, Ascension and Tristan da Cunha

Last updated: July 2, 2025

In Georgetown, Saint Helena, Ascension, and Tristan da Cunha, being aware of the UV Index is crucial for maintaining your skin's health and preventing sunburn. Understanding UV levels allows residents and visitors alike to make informed decisions about sun exposure, ensuring that the beautiful surroundings can be enjoyed safely. With a tropical maritime climate, Georgetown experiences varying levels of UV exposure throughout the day, peaking at a high of 10 around 1:00 PM. This makes it essential to take protective measures during the sun's most intense hours, helping to safeguard against the long-term impacts of UV harm.

Hourly UV Index in Georgetown

The UV Index shows a dramatic rise as the day progresses, starting from a maximum of 0 at 7:00 AM, indicating minimal risk for sun exposure. By 8:00 AM, it gently climbs to 1, but the real surge begins around 10:00 AM when the index hits 4. The peak is reached at 1:00 PM with a notable 10, representing a very high risk of harm from unprotected sun exposure. After this zenith, the index starts to decline, falling to 9 at 2:00 PM and gradually decreasing to 0 by 7:00 PM, suggesting a clear pattern of increasing danger in the midday hours. Remember to protect your skin during the peak UV times to 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	0	low	45 min
08:00	1	low	45 min
09:00	2	low	45 min
10:00	4	moderate	30 min
11:00	7	high	25 min
12:00	9	very high	15 min
13:00	10	very high	15 min
14:00	9	very high	15 min
15:00	7	high	25 min
16:00	4	moderate	30 min
17:00	2	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Georgetown

During the year, UV Index levels exhibit minimal fluctuation, remaining predominantly at 14 (extreme) from January through March, with a slight decrease to 13 in April and 12 in May. The months of June and July see a drop to 10 (very high), before rising back to 11 in August. From September through November, the index returns to extreme levels, peaking again in December. High-risk months are identified as January, February, March, and November, where immediate and consistent protection against UV radiation is crucial, with a burn time as low as 10 minutes. Residents and visitors are advised to prioritize sun protection strategies year-round, especially during peak months, by using sunscreen, wearing protective clothing, and limiting sun exposure during peak hours to mitigate health risks.

Monthly Maximum UV Index for Georgetown, Saint Helena, Ascension and Tristan da Cunha

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Georgetown. 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 Georgetown, 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 Georgetown UV Index with Other Saint Helena, Ascension and Tristan da Cunha Cities

The table above highlights how UV exposure in Georgetown compares to other major locations across Saint Helena, Ascension and Tristan da Cunha. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.

Georgetown's solar exposure compared to other cities in Saint Helena, Ascension and Tristan da Cunha. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Edinburgh of the Seven Seas UVI	14	13	11	7	4	3	3	5	8	10	12	15
Jamestown UVI	15	15	13	12	9	8	8	10	11	14	14	15
Longwood UVI	15	15	13	12	9	8	8	10	11	14	14	15
Half Tree Hollow UVI	15	15	13	12	9	8	8	10	11	14	14	15
Georgetown	14	14	14	13	12	10	10	11	12	13	14	14