UV Index in Ritto, Japan

Last updated: June 2, 2025

Understanding the UV Index is crucial for residents and visitors in Ritto, Japan, where the Cfa climate brings warm, sunny days. Awareness of UV levels can significantly impact your health by helping prevent sunburn and long-term skin damage. During peak hours, particularly from 11:00 AM to 1:00 PM, the UV Index peaks at 11, indicating a very high risk of harm from unprotected sun exposure. As you enjoy Ritto's picturesque days, staying informed about these UV levels can be a key part of protecting your skin and ensuring a safe and enjoyable outdoor experience.

Hourly UV Index in Ritto

As the sun rises, the UV Index begins its ascent, starting at a gentle 2 at 07:00. By 08:00, it climbs to 4, indicating that protective measures are beginning to be advisable. The intensity peaks at 11 during the 11:00 and 12:00 hours, marking the time when sunlight is most potent. As the afternoon progresses, the index starts to decline; by 14:00, it drops to 8, and further diminishes to 6 by 15:00. As evening approaches, the UV Index wanes significantly, reducing to 3 at 16:00 and sinking to a mild 1 by 18:00, indicating a much lower risk. Overall, it’s a sun-soaked day, urging outdoor enthusiasts to be mindful of sun exposure, especially during those peak 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	6	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	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 Ritto

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 Ritto, Japan

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

The table above highlights how UV exposure in Ritto 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.

Ritto'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
Ritto	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