UV Index in Fukushima, Japan

Last updated: May 3, 2025

In Fukushima, Japan, being aware of the UV Index is essential for everyone who enjoys the outdoors. Understanding the UV levels not only helps you prevent painful sunburns but also plays a crucial role in maintaining optimal skin health over time. With its Dfa climate, Fukushima experiences significant UV exposure, particularly during midday hours when the index can peak at 9 between 11:00 AM and 12:00 PM. By keeping an eye on the UV Index, you can take proactive measures to protect yourself and your loved ones from the harmful effects of ultraviolet rays.

Hourly UV Index in Fukushima

As the sun rises, the UV Index begins its ascent, peaking at 11:00 AM and 12:00 PM with a blistering 9. The day starts gently, with 07:00 AM registering a modest 2, but by 09:00 AM, it climbs to a moderate 6. The intensity escalates, hitting 8 at 10:00 AM and reaching its zenith shortly after noon. After this peak, the index gradually dips, easing down to 6 by 2:00 PM, before falling further to 4 at 3:00 PM. As evening approaches, the UV radiation wanes significantly, dropping to 2 by 4:00 PM and near zero after sunset, signaling a shift in the skies. Remember to protect your skin 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	4	moderate	30 min
09:00	6	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 Fukushima

Throughout the year, the UV Index experiences significant fluctuations, with the most intense levels occurring during the summer months. From April to August, the index rises sharply, peaking at 11 in August, which falls into the extreme exposure category. Consequently, April through September are considered high-risk months for UV exposure, with burn times decreasing to as little as 10-15 minutes during this period. Residents and visitors are strongly advised to take precautions by wearing sunscreen, protective clothing, and hats, especially during midday hours when the sun's rays are most intense. Conversely, during the winter months of December through February, the risk is considerably lower, with the UV Index ranging from 2 to 4 and longer burn times of 30-45 minutes, allowing for more outdoor activities with reduced risk.

Monthly Maximum UV Index for Fukushima, Japan

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

The table above highlights how UV exposure in Fukushima 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.

Fukushima'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
Fukushima	3	4	5	8	9	10	10	11	8	6	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
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