UV Index in Ashiya, Japan

Last updated: June 2, 2025

Understanding the UV Index is crucial for residents of Ashiya, Japan, where sunny days are frequent and can lead to skin damage if precautions aren’t taken. With UV levels peaking at 11 around noon, awareness of these readings is vital for preventing sunburn and protecting skin health. Ashiya, situated in a Cfa climate zone, experiences high UV exposure, making it essential to grasp the risks associated with daily sun exposure. Stay informed and safeguard your skin by keeping an eye on the UV Index—your future self will thank you!

Hourly UV Index in Ashiya

As the sun rises, the UV Index begins at a mild 2 at 07:00, gradually escalating to a moderate 4 by 08:00. By 09:00, awareness becomes crucial as the index climbs to 6. The sun reaches its peak intensity at 12:00 with a notable 11, indicating high risk for sun exposure. Fortunately, after 1 PM, the index starts to decline, reaching 8 at 14:00, then gradually dropping to 6 by 15:00. The late afternoon brings relief with values of 3 at 16:00 and cooling further to 1 by 18:00 and 19:00. It's essential to take protective measures during the peak hours, particularly between 10 AM and 2 PM, to safeguard your skin from harmful UV rays.

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	10	very high	15 min
12:00	11	extreme	10 min
13:00	10	very high	15 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	1	low	45 min

Monthly UV Index Trends in Ashiya

Throughout the year, the UV Index exhibits significant seasonal changes, indicating varying levels of sun exposure risk. The high-risk months for UV radiation are typically from March to August, where the UV Index reaches an extreme level of 11, suggesting a burn time as short as 10 minutes. Notably, April through August presents the highest risk, when protective measures are particularly crucial. As such, it is advisable for both visitors and residents to take precautions, such as wearing sunscreen, protective clothing, and seeking shade during peak hours, especially in these summer months. Conversely, during the cooler months of January, December, and November, the UV Index drops to moderate levels, allowing for more relaxed sun exposure. Overall, staying informed about the UV Index is essential for enjoying the outdoors safely year-round.

Monthly Maximum UV Index for Ashiya, Japan

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

The table above highlights how UV exposure in Ashiya 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.

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