UV Index in Nanao, Japan

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents and visitors in Nanao, Japan, where the Cfa climate brings vibrant summers and significant sun exposure. Awareness of UV levels can help you prevent sunburn and protect your skin's health, as even short periods of high UV exposure can lead to harmful effects. In Nanao, maximum UV Index values can soar to 11, especially during midday hours, indicating extreme risk. By staying informed about local UV conditions, you can enjoy the outdoors while safeguarding yourself against potential skin damage. Keep an eye on those UV levels and make sun safety a priority!

Hourly UV Index in Nanao

As the sun rises, the UV Index begins at a mild 2 at 07:00, gradually escalating to a moderate 4 by 08:00. By 09:00, awareness becomes crucial as the index climbs to 6. The sun reaches its peak intensity at 12:00 with a notable 11, indicating high risk for sun exposure. Fortunately, after 1 PM, the index starts to decline, reaching 8 at 14:00, then gradually dropping to 6 by 15:00. The late afternoon brings relief with values of 3 at 16:00 and cooling further to 1 by 18:00 and 19:00. It's essential to take protective measures during the peak hours, particularly between 10 AM and 2 PM, to safeguard your skin from harmful UV rays.

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	6	high	25 min
10:00	9	very high	15 min
11:00	10	very high	15 min
12:00	11	extreme	10 min
13:00	10	very high	15 min
14:00	8	very high	15 min
15:00	6	high	25 min
16:00	3	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 Nanao

The UV Index experiences significant seasonal changes, with high-risk months occurring from March to September. During this period, the UV Index escalates from moderate levels of 3 in January and February to extreme levels of 11 in June, July, and August. The burn time dramatically decreases, from 30 minutes in January and February to just 10 minutes in the peak summer months. Visitors and residents are strongly advised to take proper precautions during the high-risk months by applying sunscreen, wearing protective clothing, and limiting sun exposure, especially between 10 AM and 4 PM when UV radiation is at its peak. After September, the UV Index begins to decline, but vigilance is still recommended through October.

Monthly Maximum UV Index for Nanao, Japan

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

The table above highlights how UV exposure in Nanao 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.

Nanao'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
Nanao	3	4	7	10	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