UV Index in Soma, Japan

Last updated: May 3, 2025

In Soma, Japan, understanding the UV Index is crucial for maintaining skin health and preventing sunburn. As a city nestled in a Cfa climate, residents and visitors alike should be aware of the varying UV levels throughout the day, especially the peak hours between 11:00 and 13:00, when the index reaches its highest at 10. By staying informed about UV exposure risks, you can better protect your skin and enjoy the beautiful sunny days that Soma has to offer, ensuring that outdoor activities remain both fun and safe.

Hourly UV Index in Soma

As the sun rises, the UV Index steadily climbs, peaking at an impressive 10 between 11:00 and 12:00, signaling intense solar exposure. Starting at a mild 3 at 07:00, it quickly ramps up, reaching 7 by 09:00 and hitting 9 by 10:00. The intensity remains strong until 14:00, where it begins to taper off to 6 and then drops further to 4 and 2 in the late afternoon. As evening approaches, the UV Index dwindles to 1 by 17:00 and finally falls to 0 after 19:00. Stay protected during the peak hours, especially between 11:00 and 14:00, to enjoy the sunny day safely!

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	3	moderate	30 min
08:00	5	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	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 Soma

Throughout the year, UV Index values experience significant seasonal changes, indicating varying levels of sun exposure risk. January and December have moderate UV Indexes (3), suggesting a safer exposure time of 30 minutes. As we move into February and November, the UV Index rises to 5, still moderate, but caution is warranted with a similar burn time. From March to October, the UV Index escalates, reaching its peak between July and August at an extreme level of 11, where only a mere 10 minutes of exposure can lead to burns. April and May also present very high risk with indexes of 9 and 10, respectively, offering 15 minutes of allowed exposure. The fall months, including September with a UV Index of 9, still require vigilance. Visitors and residents are urged to take necessary precautions during high-risk months—especially from March through August—to protect their skin, such as seeking shade, wearing protective clothing, and applying broad-spectrum sunscreen regularly.

Monthly Maximum UV Index for Soma, Japan

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

The table above highlights how UV exposure in Soma 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.

Soma'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
Soma	3	5	7	9	10	10	11	11	9	6	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