UV Index in Hirara, Japan

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents and visitors of Hirara, Japan, where the sun's rays can be intense, particularly during the midday hours. With a Cfa climate, Hirara experiences hot summers, making it important to be aware of UV levels to prevent sunburn and support overall skin health. The UV Index can soar to 13 around noon, indicating a very high risk of harm from unprotected sun exposure. By staying informed about UV conditions, you can enjoy the beautiful outdoors while taking necessary precautions to protect your skin from potential damage.

Hourly UV Index in Hirara

The UV Index for the day starts off mild, peaking at 1 at 7:00 AM, and gradually increases to a moderate level of 2 by 8:00 AM. As the sun climbs higher, the intensity rises sharply, reaching its maximum of 13 at 12:00 PM and sustaining this level until 1:00 PM, indicating a significant risk for sun exposure. Post noon, the UV Index begins to decline, dropping to 9 by 3:00 PM and further tapering off to a gentle 3 at 5:00 PM. By 6:00 PM, it settles back to a comfortable 1, perfect for evening strolls. This pattern highlights the importance of seeking shade and protection during the peak hours, especially between 11:00 AM and 1:00 PM when the UV radiation is most intense.

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	2	low	45 min
09:00	5	moderate	30 min
10:00	8	very high	15 min
11:00	11	extreme	10 min
12:00	13	extreme	10 min
13:00	13	extreme	10 min
14:00	12	extreme	10 min
15:00	9	very high	15 min
16:00	5	moderate	30 min
17:00	3	moderate	30 min
18:00	1	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Hirara

Throughout the year, the UV Index shows significant seasonal changes, peaking during the summer months. From January to December, the highest UV readings occur from March to September, reaching an extreme level of 13. Particularly, May through September are categorized as high-risk months, with minimal safe exposure times of just 10 minutes. In contrast, the UV Index decreases to 7 in both January and December, indicating a transition to high exposure but with a more manageable burn time of 25 minutes. Visitors and residents are strongly advised to take precautions during the high-risk months, including wearing protective clothing, applying sunscreen regularly, and limiting sun exposure, especially between 10 a.m. and 4 p.m. to reduce the risk of skin damage.

Monthly Maximum UV Index for Hirara, Japan

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

The table above highlights how UV exposure in Hirara 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.

Hirara'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
Hirara	7	10	12	12	13	13	13	13	13	10	9	7