UV Index in Numata, Japan

Last updated: June 2, 2025

In Numata, Japan, understanding the UV Index is crucial for protecting your skin from harmful ultraviolet rays. As residents and visitors embrace the outdoor beauty of this city, being aware of UV levels can help prevent painful sunburns and long-term skin health issues. With a Dfb climate, Numata experiences significant UV exposure, particularly around midday when the index peaks at 11. This highlights the importance of sun safety practices during the summer months, ensuring that everyone can enjoy their time outdoors without compromising their health.

Hourly UV Index in Numata

As the sun rises, the UV Index begins to climb, starting at a mild 3 at 07:00. By 08:00, it reaches a moderate 5, signaling that it's time to start thinking about sun protection. The intensity peaks at 11 from 11:00 to 12:00, marking the highest risk period of the day. As the afternoon progresses, the UV Index gradually declines, dropping to 8 at 14:00 before dwindling to 5 by 15:00. As the day winds down, the index continues to fall, hitting a low of 1 from 16:00 to 18:00, and finally reaching 0 after 19:00. It’s essential to stay vigilant and take precautions during the peak hours to enjoy the sunshine safely!

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	3	moderate	30 min
08:00	5	moderate	30 min
09:00	7	high	25 min
10:00	10	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	1	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Numata

Throughout the year, UV radiation levels fluctuate significantly, impacting exposure risks for visitors and residents. The high-risk months for UV exposure are March through August, where the UV Index reaches very high to extreme levels, particularly peaking at an Index of 11 during May to August, allowing for a burn time of just 10 minutes. In contrast, the moderate UV conditions in January, November, and December allow for longer burn times of 30 minutes but still require caution. Visitors and residents should take appropriate precautions, such as wearing sunscreen, protective clothing, and sunglasses, especially during high UV months, to minimize the risk of skin damage.

Monthly Maximum UV Index for Numata, Japan

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

The table above highlights how UV exposure in Numata 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.

Numata'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
Numata	4	6	9	9	11	11	11	11	10	7	5	3
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