UV Index in Hirara, Japan

Last updated: May 3, 2025

In Hirara, Japan, awareness of the UV Index is essential for maintaining skin health and preventing sunburn. With the sun reaching its peak at 11:00 AM with a staggering UV Index of 11, it's crucial for residents and visitors alike to understand the UV levels and adjust their sun protection measures accordingly. Hirara's Cfa climate brings about warm summers, leading to significant UV exposure risks, especially during midday hours. By staying informed about the UV Index, you can enjoy the beauty of Hirara while safeguarding your skin against harmful UV rays.

Hourly UV Index in Hirara

As the day unfolds, the UV Index reveals a dynamic pattern of sun exposure that peaks during midday. Starting at a gentle 1 at 07:00, the index gradually climbs, reaching a moderate 5 by 09:00. However, the real intensity kicks in around 10:00, skyrocketing to 8, and hitting its zenith at 12:00 with a striking 13. Be cautious! Direct sunlight can be harmful, as it dips slightly to 12 at 13:00 before gradually falling back down through 11 at 14:00 and 8 at 15:00. By late afternoon, the UV levels decrease to 5 by 16:00, and finally sink back to 1 by 18:00 and 19:00. It's a reminder of the sun's powerful rays—plan your outdoor activities accordingly!

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	12	extreme	10 min
14:00	11	extreme	10 min
15:00	8	very high	15 min
16:00	5	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 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