UV Index in Isen, Japan

Last updated: May 3, 2025

In Isen, Japan, staying informed about the UV Index is crucial for protecting your skin from harmful ultraviolet radiation. Understanding UV levels can help you prevent sunburn and reduce the risk of long-term skin damage, ensuring your outdoor activities remain safe and enjoyable. With a Cfa climate, Isen experiences varying UV exposure throughout the day, peaking at an intense UV Index of 12 during midday hours. Awareness of these levels empowers residents and visitors alike to take necessary precautions, safeguarding their skin health while soaking up the sun.

Hourly UV Index in Isen

During the morning hours, the UV Index starts off low at 1 at 7:00 AM, indicating minimal risk of harm from unprotected sun exposure. As the day progresses, the intensity ramps up, peaking at 12 around 12:00 PM and 1:00 PM, suggesting a high risk for harm, especially for those spending extended periods outdoors. Post-peak, the index gradually declines, dropping to 7 at 3:00 PM and further down to 1 by 7:00 PM, which indicates a return to minimal risk as the sun sets. For sun enthusiasts, midday offers the most intense UV radiation, making sun protection essential during those hours!

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	12	extreme	10 min
13:00	12	extreme	10 min
14:00	10	very high	15 min
15:00	7	high	25 min
16:00	4	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 Isen

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 Isen, Japan

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

The table above highlights how UV exposure in Isen 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.

Isen'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
Isen	6	8	11	12	12	13	13	13	12	9	8	6