UV Index in Hamura, Japan

Last updated: June 2, 2025

Understanding the UV Index in Hamura, Japan, is vital for protecting your skin and overall health. High UV levels pose significant risks, including sunburn and long-term skin damage, making it crucial to stay informed about daily fluctuations. With a Cfa climate, Hamura experiences distinct seasonal changes and varying UV exposure throughout the year. During peak hours, especially between 10:00 AM and 1:00 PM, the UV Index can soar to levels of 11, indicating a need for caution. By recognizing these levels, residents and visitors can take proactive measures to enjoy the outdoors safely while safeguarding their skin health.

Hourly UV Index in Hamura

As the day unfolds, the UV Index rises sharply, peaking during the midday hours. At 07:00, it begins at a modest 2, but by 09:00, it escalates to 7, urging outdoor enthusiasts to take precautions. The sun reaches its zenith between 10:00 and 12:00, with the index soaring to a maximum of 11—a clear signal for sun safety measures. As the afternoon progresses, the intensity diminishes; by 14:00, it drops to 7, and further declines to 5 by 15:00. As daylight wanes, the index continues to fall, resting at 1 by 17:00 and tapering off to 0 post 19:00. This rhythmic rise and fall of UV exposure highlights the importance of midday vigilance against harmful rays.

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	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	7	high	25 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 Hamura

Throughout the year, seasonal changes in UV Index reveal significant variations in sun exposure risk. The high-risk months for UV exposure are predominantly from March to August, with the peak occurring in May, June, July, and August, where the UV Index reaches 11, categorized as extreme with a burn time of just 10 minutes. During this period, individuals are strongly advised to take precautions such as wearing sunscreen, protective clothing, and seeking shade, especially between 10 AM and 4 PM, when UV radiation is at its strongest. In contrast, the UV Index indicates moderate levels in January, November, and December, and high levels in October and February—months where sun safety should still be observed, though the urgency is somewhat reduced.

Monthly Maximum UV Index for Hamura, Japan

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

The table above highlights how UV exposure in Hamura 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.

Hamura'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
Hamura	4	6	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