UV Index in Aisai, Japan

Last updated: July 2, 2025

Understanding the UV Index is vital for residents of Aisai, Japan, where the climate falls within the temperate Cfa zone, leading to varying UV exposure throughout the year. By keeping an eye on UV levels, you can significantly reduce the risk of sunburn and promote better skin health. Notably, during midday, Aisai's UV Index can soar as high as 11, indicating an increased risk of harm from unprotected sun exposure. Becoming aware of these levels empowers you to take proactive measures for skin protection, ensuring you enjoy the beautiful outdoors safely.

Hourly UV Index in Aisai

As the sun rises, the UV Index begins its ascent, starting at a mild 2 at 07:00. By 08:00, it climbs to 4, hinting at a brighter day ahead. The intensity peaks around 11:00 and 12:00, where it reaches an impressive 11, calling for caution as rays intensify. Midday to early afternoon (12:00 - 14:00) is the most formidable, with the index hovering around 10 and 8 before gradually descending. By 17:00, it dips back to a manageable 2, and as evening sets in, the sun's grip fades, dropping to 0 by 19:00. This dynamic pattern highlights the necessity of sun protection, especially during the 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	7	high	25 min
10:00	9	very high	15 min
11:00	11	extreme	10 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	0	low	45 min

Monthly UV Index Trends in Aisai

Throughout the year, UV exposure varies significantly, peaking during the summer months. High-risk months for UV exposure are from March to August, when the UV Index reaches its maximum levels of 10 to 11 and the burn time is as brief as 10 minutes. Notably, May through August features extreme exposure, requiring diligent sun protection practices. As the year transitions into fall, September to November sees a decrease in UV levels, with October still posing a moderate risk. To ensure safety, visitors and residents are advised to wear protective clothing, use sunscreen, and seek shade during the peak sun hours, especially from late spring through summer when the threat of sunburn is greatest.

Monthly Maximum UV Index for Aisai, Japan

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

The table above highlights how UV exposure in Aisai 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.

Aisai'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
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
Aisai	4	6	8	10	11	11	11	11	10	7	5	3
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