UV Index in Namerikawa, Japan

Last updated: July 2, 2025

In Namerikawa, Japan, understanding the UV Index is crucial for maintaining skin health and preventing sunburn. The UV Index here can peak at a significant 11 during midday hours, highlighting the importance of being aware of sunlight exposure throughout the day. With a Cfa climate, residents and visitors alike face varying UV risks depending on the time of year and day. By staying informed about UV levels, you can protect your skin from harmful effects and enjoy the beautiful outdoors safely.

Hourly UV Index in Namerikawa

The UV Index readings throughout the day reveal a dramatic rise in sun intensity as the morning unfolds. Starting at 2 at 07:00, the index climbs steadily, peaking at a scorching 11 by noon and remaining high until around 13:00. As the afternoon progresses, the UV Index gently declines, dropping to 5 by 15:00 and further descending to 1 by the evening hours. This pattern highlights the importance of sun protection during midday, as the intense solar radiation can pose health risks. Stay safe and enjoy the sun wisely!

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	10	very high	15 min
14:00	8	very high	15 min
15:00	5	moderate	30 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 Namerikawa

Throughout the year, the UV Index experiences significant fluctuations, with the peak values occurring in the summer months. Notably, March through August sees a dramatic rise in UV exposure, particularly in June, July, and August when the index reaches an extreme level of 11, resulting in a rapid burn time of just 10 minutes. Conversely, the winter months of January, November, and December show much lower UV levels, described as moderate, with burn times extending to 30 minutes. Visitors and residents are advised to be especially cautious from March to September, when UV exposure can lead to skin damage in a very short time. It is essential to wear sunscreen, seek shade, and wear protective clothing during these high-risk months to minimize health risks associated with UV radiation.

Monthly Maximum UV Index for Namerikawa, Japan

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

The table above highlights how UV exposure in Namerikawa 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.

Namerikawa'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
Namerikawa	4	5	8	10	10	11	11	11	10	7	5	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