UV Index in Nagai, Japan

Last updated: May 3, 2025

Understanding the UV Index is crucial for residents and visitors in Nagai, Japan—a place where the Dfb climate brings a mix of mild summers and cold winters. As UV levels can soar, particularly during midday, being aware of the UV Index can help you prevent sunburn and protect long-term skin health. With peak UV readings reaching 10 around noon, understanding the risks and taking precautions is essential for enjoying the sun safely. So, whether you're lounging outside or embarking on outdoor adventures, staying informed about UV levels can help you bask in Nagai's beauty while safeguarding your skin.

Hourly UV Index in Nagai

The UV Index for today peaks dramatically as the sun rises, beginning at a modest 2 at 07:00. The intensity quickly escalates, reaching 4 by 08:00 and soaring to 7 by 09:00. By 10:00, the index hits 9, and it reaches its zenith at 11:00 and 12:00, both clocking in at an impressive 10—indicating a high risk of harm from unprotected sun exposure. As the afternoon progresses, the index gradually declines, dipping to 9 at 13:00, then sliding to 7 at 14:00. By 15:00, it reduces to 4, and as the day winds down, the index falls to 2 at 16:00, and further to 1 by 17:00 and 18:00, before settling at a safe 0 by 19:00. Remember, it’s crucial to protect your skin during the peak hours when the UV Index 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	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	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 Nagai

Throughout the year, UV levels demonstrate significant seasonal variations, with high-risk months typically occurring from March through August. During this period, the UV Index peaks at 11 in June, July, and August, marking it as an extreme risk category with a burn time of just 10 minutes. In contrast, the lowest UV Index readings, categorized as moderate, occur in January, February, November, and December, allowing for 30-minute exposure without immediate risk of skin damage. Visitors and residents should prioritize sun safety measures, particularly in the high-risk months—using sunscreen, wearing protective clothing, and seeking shade during peak hours to minimize potential harm from intense UV radiation.

Monthly Maximum UV Index for Nagai, Japan

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

The table above highlights how UV exposure in Nagai 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.

Nagai'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
Nagai	3	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