UV Index in Otsu, Japan

Last updated: July 2, 2025

In Otsu, Japan, understanding the UV Index is crucial for safeguarding your skin and overall health. With the region's climate classified as Cfa, residents and visitors alike should be mindful of potential sunburn and long-term skin damage, especially during the peak hours when UV levels soar. From a moderate 4 in the morning to a maximum of 11 from 11 AM to 1 PM, the UV intensity can escalate quickly. This awareness not only promotes better sun safety practices but also encourages a healthier lifestyle in a sunny locale, where proactive measures can significantly reduce risks associated with UV exposure.

Hourly UV Index in Otsu

The UV Index data paints a vivid picture of the sun's intensity throughout the day. Starting at 07:00, the index is quite low at 2, but as the morning unfolds, it begins to climb sharply. By 09:00, it hits 7 and reaches its peak at 11:00 and 12:00 with an impressive 11. This suggests that exposure during these hours poses a higher risk of harm without adequate protection. As the afternoon wanes, the UV Index begins to taper off, dropping to 9 by 14:00 and decreasing further to 6 by 15:00. As the sun sets, the index returns to a safe low of 1 by 18:00 and remains there until 19:00. For sun-seekers, this data emphasizes the importance of seeking shade and wearing sunscreen during those critical mid-day hours!

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	11	extreme	10 min
14:00	9	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 Otsu

Throughout the year, UV exposure varies significantly, peaking during the summer months. High-risk months for UV exposure are from March to August, when the UV Index reaches its maximum levels of 10 to 11 and the burn time is as brief as 10 minutes. Notably, May through August features extreme exposure, requiring diligent sun protection practices. As the year transitions into fall, September to November sees a decrease in UV levels, with October still posing a moderate risk. To ensure safety, visitors and residents are advised to wear protective clothing, use sunscreen, and seek shade during the peak sun hours, especially from late spring through summer when the threat of sunburn is greatest.

Monthly Maximum UV Index for Otsu, Japan

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

The table above highlights how UV exposure in Otsu 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.

Otsu'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
Otsu	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