UV Index in Chikuma, Japan

Last updated: June 2, 2025

Understanding the UV Index in Chikuma, Japan, is crucial for safeguarding your skin and overall health as you enjoy the outdoors. With UV levels peaking around midday, reaching a high of 11 between 11:00 AM and 12:00 PM, it's essential to be aware of sun exposure to prevent sunburn and long-term skin damage. Chikuma, characterized by its Dfb climate, experiences significant UV exposure that can vary throughout the day, making it all the more important to stay informed and take protective measures when enjoying the sun. Prioritize your skin health by staying in the know about the UV Index!

Hourly UV Index in Chikuma

The UV Index throughout the day exhibits a clear peak around midday, reflecting the sun's intensity. Starting from a mild 2 at 07:00, it swiftly rises to a moderate 5 by 08:00. By 09:00, the index escalates to a more intense 7, reaching a notable 10 at 10:00, and hitting its maximum of 11 at both 11:00 and 12:00. As the afternoon progresses, the index begins to decline, dropping to 10 at 13:00, then gradually lowering to 8 at 14:00 and 6 by 15:00. The evening sees a rapid decrease, with values falling to 3 at 16:00, then to 2 at 17:00, and finally tapering off to 1 at 18:00 and 0 by 19:00. This pattern emphasizes the importance of sun protection during the peak hours of 11:00 to 14:00 when UV exposure is highest.

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	10	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