UV Index in St Helena, Australia

Last updated: July 2, 2025

In St Helena, Australia, staying informed about the UV Index is crucial for safeguarding your skin health and preventing sunburn. Understanding UV levels helps residents and visitors make informed decisions about sun protection, especially during the warmer months when exposure risks peak. With a Cfb climate, St Helena typically experiences moderate UV exposure; however, midday levels can reach a significant 3, making it essential to stay vigilant. By monitoring the UV Index, you can enjoy the beautiful Australian outdoors while protecting your skin from harmful effects.

Hourly UV Index in St Helena

The UV Index throughout the day offers a clear insight into solar intensity, peaking at 3 between 11:00 AM and 1:00 PM, signaling moderate sun exposure. The day begins with 0 UV at 7:00 AM, gradually rising to 1 by 8:00 AM and maintaining a low level until 10:00 AM. As the sun climbs higher, the index reaches 2 by mid-morning and then stabilizes at 3 during the lunch hours, suggesting the need for sun protection. By mid-afternoon, numbers dip back to 2 and diminish further to 1 as the evening approaches. Finally, the UV Index returns to 0 after 6:00 PM, marking a transition into a safer time to enjoy the outdoors without risk of sunburn.

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	1	low	45 min
10:00	2	low	45 min
11:00	3	moderate	30 min
12:00	3	moderate	30 min
13:00	3	moderate	30 min
14:00	2	low	45 min
15:00	2	low	45 min
16:00	1	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 St Helena

Throughout the year, UV Index levels fluctuate significantly, indicating varying degrees of sun exposure risk. The high-risk months for UV exposure are January, February, March, November, and December, each exhibiting an extreme UV Index with a burn time of just 10 minutes. Following these months, April and September score a high UV Index, where a burn can occur in 25 minutes. Conversely, the UV Index drops to moderate levels in May, June, July, and August, allowing for safer outdoor activities with longer burn times of 30 minutes. October sees a shift back to a very high UV Index, with a burn time of only 15 minutes. Therefore, visitors and residents alike should exercise caution during the extreme months, ensuring adequate sun protection, and be mindful of the moderate months for prolonged outdoor enjoyment with fewer risks.

Monthly Maximum UV Index for St Helena, Australia

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in St Helena. 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 St Helena, 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 St Helena UV Index with Other Australia Cities

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

St Helena's solar exposure compared to other cities in Australia. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
St Helena	14	12	11	7	4	3	3	5	7	9	12	14
Melbourne UVI	14	12	11	7	4	3	3	5	7	9	12	14
Adelaide UVI	14	13	12	8	5	3	4	5	7	10	12	15
Sydney UVI	14	13	11	8	5	3	4	6	8	10	12	14
Perth UVI	14	14	11	9	6	4	4	6	8	11	13	14
Brisbane UVI	15	15	13	10	7	5	5	8	9	12	14	15