UV Index in Uken, Japan

Last updated: June 2, 2025

In Uken, Japan, being aware of the UV Index is crucial for protecting your skin and maintaining overall health. Understanding UV levels is vital not only for preventing sunburn but also for reducing the risk of long-term skin damage. Uken’s Cfa climate brings ample sunshine, especially during peak hours when the UV Index can soar to a staggering 13 around noon. This highlights the importance of monitoring UV exposure daily, especially for outdoor activities, to ensure you enjoy the sun safely.

Hourly UV Index in Uken

As the sun rises on this radiant day, the UV Index begins its ascent, starting at a mild 1 at 07:00 and gradually climbing. By 09:00, it reaches 6, indicating it's time to take some precautions. The intensity peaks at 12:00 with a robust 13, making it essential to seek shade and wear protective gear. For the next hour, the UV Index holds steady at its maximum, but begins to dip as the afternoon progresses—dropping to 8 by 15:00 and further down to 1 by 19:00. This fluctuation highlights the importance of sun safety, especially during the midday hours when UV exposure is at its 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	1	low	45 min
08:00	3	moderate	30 min
09:00	6	high	25 min
10:00	9	very high	15 min
11:00	11	extreme	10 min
12:00	13	extreme	10 min
13:00	13	extreme	10 min
14:00	11	extreme	10 min
15:00	8	very high	15 min
16:00	5	moderate	30 min
17:00	2	low	45 min
18:00	1	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Uken

Throughout the year, UV levels exhibit significant seasonal variations, with March to September being particularly dangerous. The highest risk months—April through August—see UV Index values reaching extreme levels (12-13), where the recommended maximum exposure time is only 10 minutes. In contrast, January and December feature high UV Index values (6) with a burn time of 25 minutes, while February and October transition to very high levels (8-9) with shorter burn times. For both visitors and residents, it is crucial to take precautionary measures during high UV index months: use broad-spectrum sunscreen, wear protective clothing, and seek shade during peak sun hours. Always monitor the UV Index to ensure safe sun exposure.

Monthly Maximum UV Index for Uken, Japan

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

The table above highlights how UV exposure in Uken 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.

Uken'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
Uken	6	8	11	12	12	13	13	13	12	9	8	6