UV Index in Uonuma, Japan

Last updated: May 3, 2025

Understanding the UV Index is essential for residents of Uonuma, Japan, as it plays a crucial role in protecting skin health and preventing sunburn. Especially during the summer months, with peak UV levels reaching as high as 10 between 11:00 AM and 1:00 PM, it's vital to be aware of the UV exposure risks associated with the region's humid subtropical climate. By staying informed about daily UV levels, you can take proactive measures to safeguard your skin while enjoying all that beautiful Uonuma has to offer.

Hourly UV Index in Uonuma

The UV Index throughout the day showcases a dynamic shift, peaking during the late morning to early afternoon hours. Starting from a mild 2 at 7:00 AM, it steadily rises, hitting 4 by 8:00 AM and escalating dramatically to a robust 10 by 11:00 AM and maintaining that intensity until 12:00 PM. After reaching its zenith, the index gently declines, dropping to 5 by 3:00 PM, before descending further to 1 by 5:00 PM. As the sun sets, the UV Index fades to 0 by 7:00 PM, signaling a stark shift in sunlight intensity. This progressive pattern highlights the importance of sun protection during peak hours, particularly from 10:00 AM to 1:00 PM, when the sun's rays are most potent.

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	4	moderate	30 min
09:00	7	high	25 min
10:00	9	very high	15 min
11:00	10	very high	15 min
12:00	10	very high	15 min
13:00	9	very high	15 min
14:00	7	high	25 min
15:00	5	moderate	30 min
16:00	2	low	45 min
17:00	1	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Uonuma

Throughout the year, UV Index values fluctuate significantly, indicating varying levels of sun exposure risk. The high-risk months for UV exposure occur from March to August, peaking during the summer months of June, July, and August with an extreme UV Index of 11 and a burn time as short as 10 minutes. Visitors and residents are strongly advised to take preventive measures during these months, such as wearing sunscreen with high SPF, protective clothing, and seeking shade whenever possible. As the year progresses, the UV Index decreases to a moderate level by November and December, allowing for safer outdoor activities, but caution is still essential, especially in early spring and late summer when burn times can still be relatively short. Remember to stay vigilant and protect your skin from harmful UV rays!

Monthly Maximum UV Index for Uonuma, Japan

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

The table above highlights how UV exposure in Uonuma 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.

Uonuma'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
Uonuma	4	5	8	9	10	11	11	11	9	7	5	3
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