UV Index in Chikuma, Japan

Last updated: July 2, 2025

Understanding the UV Index in Chikuma, Japan is essential for promoting skin health and preventing sunburn, particularly during the warm months when UV radiation is at its peak. With a temperate Dfb climate, residents can experience significant UV exposure, especially between 10:00 AM and 2:00 PM when levels reach a maximum of 11. By becoming aware of these levels, you can take proactive measures to protect yourself and your family from harmful UV rays, ensuring enjoyable and safe outdoor experiences throughout the year. Always check the UV Index to stay informed and shield your skin effectively!

Hourly UV Index in Chikuma

Throughout the day, the UV Index experiences a dramatic rise, peaking at an impressive 11 between 11:00 AM and 12:00 PM, indicating a very high risk of harm from unprotected sun exposure. Early morning sees a moderate UV level, starting at 2 at 07:00 AM and climbing steadily, reaching 5 by 08:00 AM. As the sun ascends, the index swiftly escalates, hitting 9 by 10:00 AM and maintaining a high point until the early afternoon. As the day progresses, the index gradually declines, slipping to 6 by 03:00 PM, then down to 2 by 05:00 PM, and finally tapering off to 0 at 07:00 PM, when UV exposure is no longer a concern. This pattern underscores the importance of sun safety practices during the midday hours when UV radiation is at its most intense.

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	2	low	45 min
08:00	5	moderate	30 min
09:00	7	high	25 min
10:00	9	very high	15 min
11:00	11	extreme	10 min
12:00	11	extreme	10 min
13:00	10	very high	15 min
14:00	8	very high	15 min
15:00	6	high	25 min
16:00	3	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 Chikuma

Throughout the year, the UV Index exhibits significant seasonal changes, peaking during the summer months. The highest risk for UV exposure occurs from March through August, with May to August categorized as extreme with UV Index values reaching up to 12. This means that residents and visitors should be particularly vigilant during these months, as the burn time reduces to just 10 minutes under direct sunlight. From September to February, the UV Index decreases, with January and December considered moderate, allowing for longer exposure times of 30 minutes. It is essential to take precautions such as wearing sunscreen, protective clothing, and seeking shade, especially during the high-risk months to minimize the risk of skin damage.

Monthly Maximum UV Index for Chikuma, Japan

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

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

Chikuma's solar exposure compared to other cities in Japan. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sapporo UVI	2	3	6	7	9	9	9	10	8	5	3	2
Yokohama UVI	3	5	8	9	11	11	11	11	10	7	5	4
Tokyo UVI	3	5	8	9	11	11	11	11	10	7	5	4
Nagoya UVI	4	6	8	10	11	11	11	11	10	7	5	3
Osaka UVI	4	6	8	11	11	11	12	11	10	7	5	3
Chikuma	4	6	9	10	11	11	11	12	10	7	5	4