UV Index in Sanuki, Japan

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents of Sanuki, Japan, where the warm Cfa climate can bring intense sun exposure. Staying informed about UV levels helps protect against sunburn and supports long-term skin health, making it essential for outdoor enthusiasts and everyday activities alike. With peak UV levels soaring to a staggering 12 around midday, Sanuki's residents must be vigilant, especially during the sunniest hours. By keeping track of the UV Index, you can enjoy the beautiful sun while minimizing risks and safeguarding your skin's wellbeing.

Hourly UV Index in Sanuki

As the day unfolds, the UV Index climbs steadily, peaking at a striking 12 around noon, signaling a high risk for skin damage without protection. Early risers at 07:00 encounter a mild 2, but the intensity increases quickly, reaching 9 by 10:00 and a critical 11 by 11:00. From 12:00 to 13:00, the index holds its highest point at 12, making it essential to seek shade or apply sunscreen. After 13:00, the UV levels gradually decrease, dropping back to a manageable 4 by 16:00 and winding down to a safe 1 by 18:00. This hourly data serves as a reminder to take sun safety precautions, especially during 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	12	extreme	10 min
13:00	11	extreme	10 min
14:00	9	very high	15 min
15:00	6	high	25 min
16:00	4	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 Sanuki

Throughout the year, the UV index experiences significant fluctuations, indicating varying levels of sun exposure risk. High-risk months are primarily from March to September, where UV indexes peak at 11 or 12, signaling extreme exposure levels and necessitating caution. Residents and visitors should be particularly vigilant during these months, with recommended burn times dropping to as low as 10 minutes in peak summer months. In contrast, the winter months of January, February, November, and December see moderate UV levels (index 4-5), with more manageable burn times of 30 minutes. To ensure safety, it’s advisable for individuals to wear protective clothing, apply sunscreen, and seek shade during peak UV hours, especially from late spring through early fall.

Monthly Maximum UV Index for Sanuki, Japan

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

The table above highlights how UV exposure in Sanuki 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.

Sanuki'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
Sanuki	4	5	8	11	11	11	12	11	10	7	5	4