UV Index in Arai, Japan

Last updated: July 2, 2025

In Arai, Japan, staying informed about the UV Index is crucial for protecting your skin and overall health. The UV Index provides important insights into the sun's intensity, helping residents and visitors understand when to seek shade and apply sunscreen to prevent painful sunburns and long-term skin damage. Given Arai's Cfa climate, with its warm summers and significant sun exposure, knowledge of UV levels is particularly essential during peak hours, when readings soar to 12 around noon. By keeping an eye on the UV Index, you can enjoy the beautiful outdoors while safeguarding your skin.

Hourly UV Index in Arai

Starting off the day, the UV Index begins at a modest 2 at 07:00, gradually rising to a moderately high 4 by 08:00. As the sun climbs higher, the intensity peaks with a striking 12 at 12:00, marking the sun’s strongest rays. The Index remains remarkably high, peaking at 11 from 11:00 to 13:00, prompting sun safety precautions. By 14:00, the value drops to 8, then continues to decline, ending the day at a minimal 0 by 19:00. With this data, it's clear that the sun calls for protection during the midday hours, especially between 10:00 and 13:00, making sunscreen and shade a must for outdoor activities!

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	10	very high	15 min
11:00	11	extreme	10 min
12:00	12	extreme	10 min
13:00	11	extreme	10 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 Arai

The UV Index experiences significant seasonal variation, with March through September being the high-risk months for sun exposure. March begins the rise with an index of 8 (very high) and only a 15-minute burn time, peaking in July with an index of 12 (extreme) and a mere 10-minute burn time. May through August consistently holds an extreme exposure category, urging increased caution during these months. As summer transitions into fall, the index gradually decreases, with October dropping to 7 (high) and 15-minute burn times for October and September, before returning to moderate levels in winter. Visitors and residents are advised to take precautions during the high-risk months by seeking shade, wearing protective clothing, and applying sunscreen regularly to minimize the risk of skin damage.

Monthly Maximum UV Index for Arai, Japan

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

The table above highlights how UV exposure in Arai 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.

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