UV Index in Oiso, Japan

Last updated: July 2, 2025

In Oiso, Japan, awareness of the UV Index is crucial for anyone looking to enjoy the sun safely. Understanding UV levels is essential not only for preventing sunburn but also for maintaining long-term skin health. Oiso's Cfa climate brings warm summers and ample sunlight, leading to heightened UV exposure, especially during peak hours when the index can soar to 12. By staying informed about the UV Index, residents and visitors can make smarter decisions about sun protection to keep their skin safe and healthy while enjoying the beautiful Oiso coastline.

Hourly UV Index in Oiso

At daybreak, the UV Index begins at a modest 2 at 7:00 AM, gradually climbing as the sun rises. By 9:00 AM, it reaches 7, signifying increasing exposure. The intensity peaks at 11:00 AM and 12:00 PM, hitting a high of 12, warning sun seekers to take precautions against harmful rays. As the afternoon progresses, the index gently declines, dropping to 5 by 3:00 PM and reducing further to 1 by 5:00 PM. Finally, the sun sets, and the UV Index falls to 0 by 7:00 PM, marking the end of a day where sun safety precautions were crucial during those peak 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	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	12	extreme	10 min
12:00	12	extreme	10 min
13:00	10	very high	15 min
14:00	8	very high	15 min
15:00	5	moderate	30 min
16:00	3	moderate	30 min
17:00	1	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Oiso

The UV Index experiences significant seasonal variation, with March through September being the high-risk months for sun exposure. March begins the rise with an index of 8 (very high) and only a 15-minute burn time, peaking in July with an index of 12 (extreme) and a mere 10-minute burn time. May through August consistently holds an extreme exposure category, urging increased caution during these months. As summer transitions into fall, the index gradually decreases, with October dropping to 7 (high) and 15-minute burn times for October and September, before returning to moderate levels in winter. Visitors and residents are advised to take precautions during the high-risk months by seeking shade, wearing protective clothing, and applying sunscreen regularly to minimize the risk of skin damage.

Monthly Maximum UV Index for Oiso, Japan

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

The table above highlights how UV exposure in Oiso 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.

Oiso'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
Oiso	4	5	8	10	11	11	12	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