UV Index in Akaiwa, Japan

Last updated: July 2, 2025

Understanding the UV Index in Akaiwa, Japan, is vital for protecting your skin from harmful ultraviolet rays. With a humid subtropical climate that often combines warm summers with significant sun exposure, being aware of UV levels is essential for preventing sunburn and maintaining skin health. During peak hours, particularly between 11:00 AM and 1:00 PM, the UV Index can soar to as high as 12, exposing residents and visitors alike to increased risks. By monitoring the UV Index, you can enjoy the beautiful outdoors while ensuring your skin stays safe and healthy.

Hourly UV Index in Akaiwa

As the day unfolds, the UV Index climbs steadily, peaking at a striking 12 around noon, signaling a high risk for skin damage without protection. Early risers at 07:00 encounter a mild 2, but the intensity increases quickly, reaching 9 by 10:00 and a critical 11 by 11:00. From 12:00 to 13:00, the index holds its highest point at 12, making it essential to seek shade or apply sunscreen. After 13:00, the UV levels gradually decrease, dropping back to a manageable 4 by 16:00 and winding down to a safe 1 by 18:00. This hourly data serves as a reminder to take sun safety precautions, especially during 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	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	6	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 Akaiwa

Throughout the year, UV exposure levels fluctuate significantly, with the highest risk months occurring from March through August, when the UV Index peaks at 11-12 and reaches an extreme exposure category, resulting in a burn time as short as 10 minutes. In contrast, the lowest risk months are January, December, and November, which present a moderate UV Index of 4-5 and allow for longer exposure times without risk of burning (30 minutes). Visitors and residents should remain vigilant during the high-risk months, employing protective measures such as sunscreen, protective clothing, and limiting direct sun exposure, especially during peak hours. It is crucial to stay aware of the changing UV Index to ensure safe enjoyment of outdoor activities year-round.

Monthly Maximum UV Index for Akaiwa, Japan

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

The table above highlights how UV exposure in Akaiwa 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.

Akaiwa'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
Akaiwa	4	6	8	11	11	11	12	12	10	7	5	4
Osaka UVI	4	6	8	11	11	11	12	11	10	7	5	3