UV Index in Grenchen, Switzerland

Last updated: July 2, 2025

Understanding the UV Index in Grenchen, Switzerland is crucial for safeguarding your skin and maintaining overall health. The UV Index provides essential information about the sun's ultraviolet radiation levels, helping you take proactive measures against sunburn and long-term skin damage. With Grenchen's Cfb climate, characterized by moderate temperatures and ample sunshine, awareness of daily UV exposure is important, especially during peak hours when the index can reach 9—indicating a high risk for harm without protection. Stay informed and enjoy the outdoors safely by understanding the UV Index and taking appropriate precautions.

Hourly UV Index in Grenchen

A beautiful day unfolds as the UV Index climbs steadily throughout the morning and peaks during the afternoon. Starting at a gentle 1 at 07:00, it gradually rises to a moderate 3 by 09:00. The intensity increases further, reaching a noticeable 5 at 10:00 and hitting a striking 6 at 11:00. Just after midday, the UV Index reaches its zenith at 9 between 13:00 and 14:00, signaling the importance of protective measures. As the sun starts to descend, values ease back to 8 at 15:00, before gradually dropping to 4 at 17:00 and returning to a safe 1 by 19:00. This progression emphasizes the need for awareness and protection from UV rays, especially during the midday heat.

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	2	low	45 min
09:00	3	moderate	30 min
10:00	5	moderate	30 min
11:00	6	high	25 min
12:00	8	very high	15 min
13:00	9	very high	15 min
14:00	9	very high	15 min
15:00	8	very high	15 min
16:00	6	high	25 min
17:00	4	moderate	30 min
18:00	3	moderate	30 min
19:00	1	low	45 min

Monthly UV Index Trends in Grenchen

Throughout the year, UV exposure fluctuates significantly, with the highest risk months occurring from May to August, when the UV Index reaches levels categorized as very high (UV Index 8-9). During these months, the burn time drastically decreases to just 15 minutes, emphasizing the need for protection. Conversely, the low risk months of January, November, and December offer a safer environment with a UV Index of 2 and a burn time of 45 minutes. As such, visitors and residents should be particularly vigilant during peak summer months by wearing sunscreen, protective clothing, and seeking shade during peak sun hours, while enjoying the milder winter months with less concern for UV exposure.

Monthly Maximum UV Index for Grenchen, Switzerland

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

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

Grenchen's solar exposure compared to other cities in Switzerland. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Basel UVI	2	3	5	6	8	9	9	8	6	4	2	1
Grenchen	2	3	5	6	8	9	9	8	6	4	2	2
Bern UVI	2	3	5	6	8	9	9	8	6	4	2	2
Zurich UVI	2	3	5	6	8	9	9	8	6	4	3	2
Geneve UVI	2	3	6	7	8	10	9	8	7	5	3	2
Lausanne UVI	2	4	6	7	8	10	9	9	7	5	3	2