UV Index in Yamoto, Japan

Last updated: August 1, 2025

Understanding the UV Index is crucial for residents of Yamoto, Japan, where the subtropical climate brings both warmth and significant sun exposure throughout the year. With UV levels peaking at a high of 10 around noon, awareness of these levels is essential for effective sunburn prevention and maintaining optimal skin health. As daylight hours unfold, the risk of harmful UV radiation fluctuates; thus, being informed about the UV Index helps you protect yourself and your loved ones from potential skin damage. Whether you're enjoying outdoor activities or just taking a stroll, knowing the UV levels in Yamoto can make all the difference in your safety under the sun.

Hourly UV Index in Yamoto

During the day, the UV Index experiences a dynamic shift, peaking in the late morning. Starting at 3 at 07:00, it escalates to reach a high of 10 by 11:00 and remains there until 12:00. As afternoon approaches, the index gradually declines, dropping back to 9 by 13:00, then to 7 at 14:00. By the mid to late afternoon, it continues its descent, falling to 5 at 15:00 and further down to 3 by 16:00. In the evening, the index diminishes significantly, plummeting to 1 at both 17:00 and 18:00, and finally reaching 0 by 19:00. This pattern highlights the importance of sun protection during the peak hours of 10:00 to 12:00 when the UV radiation is most intense.

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	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 Yamoto

Throughout the year, UV exposure fluctuates significantly, with the highest risk months occurring from April to August. During this period, the UV Index reaches very high to extreme levels, peaking at 11 in July, where burn time is as little as 10 minutes. In contrast, from January to February and November to December, the UV Index remains at a moderate level (3-4), allowing for 30-minute burn times. To protect against harmful UV radiation, it is crucial for both visitors and residents to take precautions, especially during high-risk months—apply broad-spectrum sunscreen, wear protective clothing, and seek shade during peak sun hours.

Monthly Maximum UV Index for Yamoto, Japan

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

The table above highlights how UV exposure in Yamoto 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.

Yamoto'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
Yamoto	3	4	6	8	9	10	11	10	9	6	4	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