UV Index in Koseda, Japan

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents and visitors in Koseda, Japan, as it directly impacts your skin health and overall well-being. With summer temperatures rising and UV levels reaching their peak—reaching a staggering high of 13 in the early afternoon—awareness of UV exposure is vital for sunburn prevention and reducing long-term skin damage. Koseda's Cfa climate brings a mixture of warm summers, making it essential to stay informed about UV risks throughout the day, especially as UV Index levels escalate quickly from moderate to extreme. Stay safe under the sun by equipping yourself with the knowledge to protect your skin!

Hourly UV Index in Koseda

As the sun rises, the UV Index begins its ascent, starting at a mild 1 at 7:00 AM. By 8:00 AM, it climbs to a moderate 3, but the real intensity kicks in after 9:00 AM when it reaches 6. The peak occurs between 11:00 AM and 12:00 PM, soaring to a blistering 12 and hitting a maximum of 13 at noon, indicating a serious need for sun protection. The intensity gradually diminishes in the afternoon, dropping to 10 by 2:00 PM and then sliding down to 4 by 4:00 PM. As the day winds down, the UV Index traces back to 2 at 5:00 PM and finally settles at 1 by 7:00 PM, welcoming the cool embrace of evening. Staying vigilant about sun safety is crucial during peak hours from 10:00 AM to 2:00 PM!

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	1	low	45 min
08:00	3	moderate	30 min
09:00	6	high	25 min
10:00	9	very high	15 min
11:00	12	extreme	10 min
12:00	13	extreme	10 min
13:00	12	extreme	10 min
14:00	10	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 Koseda

Throughout the year, the UV Index exhibits significant seasonal variations, with the highest risks occurring between March and September. During this period, particularly in June, July, and August, the UV Index reaches its peak at 13, indicating extreme exposure levels with a burn time of just 10 minutes. Conversely, the UV levels are generally moderate in January and December (UV Index 5) and high in February and November (UV Index 7), where burn times extend to 25-30 minutes. Residents and visitors are strongly advised to take precautionary measures, especially from March to September, by seeking shade, wearing protective clothing, and applying sunscreen, to reduce the risk of skin damage from UV radiation.

Monthly Maximum UV Index for Koseda, Japan

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

The table above highlights how UV exposure in Koseda 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.

Koseda'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
Koseda	5	7	10	11	12	12	13	13	11	8	7	5