UV Index in Nakatsugawa, Japan

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents of Nakatsugawa, Japan, where the Cfa climate brings warm summers and varied UV exposure. Being aware of UV levels not only helps in preventing sunburn but also plays a vital role in maintaining overall skin health. With peak UV Index values reaching as high as 12 during midday, the risks of prolonged sun exposure increase significantly, making it essential for locals and visitors alike to track these daily fluctuations. Safeguarding your skin against harmful UV rays is an investment in your long-term health—stay informed and enjoy the sunny days safely!

Hourly UV Index in Nakatsugawa

The UV Index data reveals a dynamic daily pattern in sunlight exposure. Rising steadily from 2 at 07:00, it reaches a peak of 12 at both 11:00 and 12:00, indicating a period of intense sun intensity where protective measures are crucial. As the afternoon unfolds, it gradually declines, dropping to 8 by 14:00 and further to 6 at 15:00. The sun’s influence lessens as evening approaches, with the index retreating to 3 by 16:00 and dwindling to 0 by 19:00. It's essential to be mindful of these fluctuations and protect your skin 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	7	high	25 min
10:00	10	very high	15 min
11:00	12	extreme	10 min
12:00	12	extreme	10 min
13:00	11	extreme	10 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	0	low	45 min

Monthly UV Index Trends in Nakatsugawa

Throughout the year, UV index levels fluctuate, with the most significant increases occurring from March to September. During these months, particularly in May, June, July, and August, the UV index reaches its peak at 12, categorized as extreme, with a burn time of just 10 minutes. March and April also present high risks, featuring very high UV levels of 9 and 10 respectively. Visitors and residents should be particularly vigilant in these high-risk months, applying sunscreen, wearing protective clothing, and seeking shade whenever possible. As UV levels decrease from late summer into fall and winter, with January and December categorized as having moderate exposure (UV index 4), precautions remain advisable to ensure skin protection year-round.

Monthly Maximum UV Index for Nakatsugawa, Japan

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

The table above highlights how UV exposure in Nakatsugawa 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.

Nakatsugawa'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
Nakatsugawa	4	6	9	10	11	11	12	12	10	7	5	4