UV Index in Kuroishi, Japan

Last updated: August 1, 2025

Understanding the UV Index in Kuroishi, Japan, is essential for safeguarding your skin and overall health. With the potential for severe sunburn and long-term skin damage, being aware of daily UV levels can make a significant difference in your sun protection habits. Kuroishi, with its Cfa climate, experiences varying UV exposure throughout the day, peaking at a high of 10 between 11:00 AM and 12:00 PM. This fluctuation underscores the importance of checking the UV Index regularly to minimize risks and enjoy the outdoors safely.

Hourly UV Index in Kuroishi

During the early morning hours, the UV Index starts off mild, peaking at 3 by 7:00 AM. As the sun climbs higher, the intensity increases, hitting 4 by 8:00 AM and dramatically soaring to a peak of 10 at both 11:00 AM and 12:00 PM. This high level indicates a very high risk for harm from unprotected sun exposure. The afternoon brings a gradual decline, with the index dropping to 9 at 1:00 PM before easing down to 5 by 3:00 PM. As the sun sets, the UV Index gently recedes to 1 by 5:00 PM, ultimately falling to 0 by 7:00 PM, signaling a safe end to UV exposure for the day. Stay protected when the index is high, and enjoy the sun responsibly!

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	5	moderate	30 min
16:00	3	moderate	30 min
17:00	1	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Kuroishi

Throughout the year, UV levels fluctuate significantly, with higher levels observed from March to September. The peak risk months are June, July, and August, where the UV Index reaches as high as 11, categorized as extreme, boasting a burn time of just 10 minutes. In spring, particularly April and May, the UV exposure escalates to very high levels (Index of 8-9), requiring heightened awareness. From October to March, UV Index values decrease, though residents and visitors should still take precautions in March (Index of 6) and October (Index of 6) due to higher risk levels. As a general guideline, it’s advisable to wear sunscreen and protective clothing, especially during peak hours, from March to August, to minimize sun exposure and reduce the risk of skin damage.

Monthly Maximum UV Index for Kuroishi, Japan

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

The table above highlights how UV exposure in Kuroishi 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.

Kuroishi'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
Kuroishi	3	4	6	8	9	10	10	11	8	6	4	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