UV Index in Sanjo, Japan

Last updated: May 3, 2025

Understanding the UV Index in Sanjo, Japan, is crucial for protecting your skin and maintaining overall health. With the city's humid subtropical climate (Cfa), residents and visitors alike must be aware of the varying UV levels throughout the day, especially during the peak hours around midday when the index can reach an intense 10. Being informed about UV exposure not only helps in preventing painful sunburns but also contributes to long-term skin health. Sanjo's climate brings a unique set of exposure risks, making it essential to check the UV Index regularly and take necessary precautions when enjoying the outdoors. Stay protected and embrace the sun safely!

Hourly UV Index in Sanjo

As the day unfolds, the UV Index begins at a mild 2 at 7:00 AM, slowly rising to reach a moderate 4 by 8:00 AM. The intensity climbs steadily, peaking at 10 by 11:00 AM and remaining at this maximum level until 12:00 PM. As the afternoon approaches, the index begins to decline, dropping to 9 at 1:00 PM, and back to 4 by 3:00 PM. By the time the sun sets, the UV Index decreases significantly to 1 at 5:00 PM and just 0 by 7:00 PM, making the early hours the most crucial for sun protection. Remember, while outdoor activities are enticing, being mindful of the UV levels is essential for skin safety!

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	8	very high	15 min
11:00	10	very high	15 min
12:00	10	very high	15 min
13:00	9	very high	15 min
14:00	7	high	25 min
15:00	4	moderate	30 min
16:00	2	low	45 min
17:00	1	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Sanjo

Throughout the year, UV exposure varies significantly, peaking during the summer months. The highest risk for sunburn occurs from April to August, with the UV Index reaching extreme levels of 11 in both July and August, where the burn time is as short as 10 minutes. March marks the transition to higher UV levels, classified as high, and offers a burn time of 25 minutes. As spring progresses into summer, the risk escalates, with the very high category dominating from April through September, emphasizing the need for sun protection. Visitors and residents should take precautionary measures during these high-risk months, including wearing sunscreen, protective clothing, and seeking shade, especially during peak hours. As the year winds down, November and December return to a moderate UV Index (3-4), allowing for more time outdoors, but vigilance is still recommended.

Monthly Maximum UV Index for Sanjo, Japan

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

The table above highlights how UV exposure in Sanjo 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.

Sanjo'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
Sanjo	3	4	7	9	10	10	11	11	9	6	4	3
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