UV Index in Yamoto, Japan

Last updated: May 3, 2025

In Yamoto, Japan, staying aware of the UV Index is crucial for protecting your skin and preventing sunburn, especially during the intense midday sun. Understanding UV levels not only helps you enjoy the outdoors safely but also plays a vital role in long-term skin health. With Yamoto’s humid subtropical climate, residents can expect elevated UV radiation, particularly from 10 AM to 2 PM, when the index peaks at 9. Knowing these levels empowers you to take appropriate precautions, ensuring that you can bask in the beauty of your surroundings while keeping your skin safe.

Hourly UV Index in Yamoto

The UV Index climbs steadily throughout the morning, starting at a manageable 3 at 07:00 and surging to a peak of 9 between 10:00 and 12:00. During these hours, sun protection is crucial as the intensity remains high, ideal for outdoor activities if precautions are taken. As the afternoon sets in, the index begins to decline, dropping to 8 by 13:00, and then tapering off to 6 at 14:00. By the afternoon, the risks lessen significantly, with readings falling to 4 at 15:00, and a gentle decline continues into the evening, reaching 1 by 17:00 and finally settling at 0 after 19:00. This pattern emphasizes the importance of maximizing sun safety during the midday hours, where the sun's rays are at their strongest.

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	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 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