UV Index in Aki, Japan

Last updated: July 2, 2025

Understanding the UV Index in Aki, Japan, is crucial for maintaining skin health and preventing sunburn. As the sun’s intensity varies throughout the day, being aware of UV levels empowers residents and visitors to take necessary precautions against harmful exposure. Aki's Cfa climate brings warm summers with heightened UV risks, particularly between late morning and early afternoon when the index peaks at 12. By staying informed, you can enjoy the sun safely while protecting your skin from damage.

Hourly UV Index in Aki

The UV Index data reveals a notable progression in sun exposure throughout the day. Starting at a modest 2 at 7:00 AM, it quickly escalates, peaking at a striking 12 by noon, indicating a high risk for harm from unprotected sun exposure. As the afternoon unfolds, the index gradually recedes, dropping to 9 at 2:00 PM and further decreasing to 1 by 7:00 PM. This pattern suggests that the sun’s intensity is at its most dangerous during the late morning and early afternoon, emphasizing the importance of sunscreen and protective measures during these critical hours. Stay safe under the sun!

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	9	very high	15 min
11:00	11	extreme	10 min
12:00	12	extreme	10 min
13:00	11	extreme	10 min
14:00	9	very high	15 min
15:00	7	high	25 min
16:00	4	moderate	30 min
17:00	2	low	45 min
18:00	1	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Aki

Throughout the year, seasonal UV Index changes highlight significant variations in sun exposure risks. The high-risk months are from March to August, where the UV Index reaches its peak at 12, indicating an extreme exposure category. During these months, the burn time is notably short—only 10 minutes, underscoring the need for heightened sun protection. In contrast, January and December present a moderate risk with UV Index values of 4, allowing for safer exposure of up to 30 minutes. As such, residents and visitors should specifically take precautions between March and August, including wearing sunscreen, protective clothing, and staying in shaded areas during peak sun hours to minimize harmful UV effects.

Monthly Maximum UV Index for Aki, Japan

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

The table above highlights how UV exposure in Aki 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.

Aki'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
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
Aki	4	6	9	11	12	12	12	12	10	8	6	4