UV Index in Oshu, Japan

Last updated: May 3, 2025

Understanding the UV Index in Oshu, Japan is crucial for protecting your skin and overall health. With summer temperatures rising, awareness of UV levels can help you prevent sunburns and long-term skin damage. Oshu, located in a Cfa climate zone, experiences varying UV exposure throughout the day, peaking at a UV Index of 9 between 11:00 AM and 12:00 PM. By keeping an eye on the UV Index, you can enjoy the outdoors safely and stay informed about when to seek shade or apply sunscreen.

Hourly UV Index in Oshu

The UV Index data for the day reveals a dynamic fluctuation in sun intensity. Starting at 7:00 AM with a mild value of 2, the UV Index climbs steadily, peaking at 11:00 AM and 12:00 PM with a high of 9—a clear indication that sun protection is crucial during these hours. As the afternoon progresses, a gradual decline begins; by 4:00 PM, the index drops to 2, followed by even lower numbers in the evening—1 at 5:00 PM and 0 by 7:00 PM. This data underscores the importance of being sun-smart during peak hours, especially between 10:00 AM and 2:00 PM when UV exposure is at its 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	8	very high	15 min
11:00	9	very high	15 min
12:00	9	very high	15 min
13:00	8	very high	15 min
14:00	6	high	25 min
15:00	4	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 Oshu

Throughout the year, seasonal changes in UV Index highlight varying levels of sun exposure risk. From January to February, the UV Index remains in the moderate range (3-4), allowing for a burn time of 30 minutes. A noticeable increase starts in March with the index rising to 6 (high), decreasing burn time to 25 minutes. April through September marks the high-risk months, where the index spikes to very high levels (8-10), significantly reducing burn time to just 15 minutes. Following September, October sees a drop back to high (6), allowing for a slightly safer exposure of 25 minutes, before returning to moderate levels (3-4) in the final months. Visitors and residents are advised to take precautions during high UV months from March to September, including wearing protective clothing, using sunscreen, and seeking shade to minimize the risk of skin damage.

Monthly Maximum UV Index for Oshu, Japan

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

The table above highlights how UV exposure in Oshu 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.

Oshu'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
Oshu	3	4	6	8	9	10	10	10	9	6	4	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