UV Index in Biratori, Japan

Last updated: May 3, 2025

Understanding the UV Index in Biratori, Japan is crucial for protecting your skin and overall health. With higher UV levels typically observed during the peak sun hours, being aware of this daily measurement helps prevent sunburn and long-term skin damage. Biratori's Dfb climate, characterized by its cold winters and warm summers, presents unique challenges in UV exposure, particularly during sunny days when levels can soar, reaching a high of 9 around noon. Stay informed and make sun safety a priority to enjoy the outdoors while keeping your skin safe!

Hourly UV Index in Biratori

The UV Index throughout the day reveals a dynamic shift in sun exposure. At dawn, 7:00 AM, it starts at a modest 3, gradually climbing to 4 by 8:00 AM. As the sun ascends, the index surges to a peak of 9 at 11:00 AM and 12:00 PM, signaling high levels of UV radiation. By 1:00 PM, it moderately declines to 7, followed by a gentle retreat to 6 at 2:00 PM and 4 at 3:00 PM. As the afternoon wanes, the numbers drop significantly, hitting 2 by 4:00 PM and tapering off to a low of 0 by 7:00 PM. Stay protected during the peak hours when the sun's rays are most intense!

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	4	moderate	30 min
09:00	6	high	25 min
10:00	8	very high	15 min
11:00	9	very high	15 min
12:00	9	very high	15 min
13:00	7	high	25 min
14:00	6	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 Biratori

Throughout the year, seasonal UV changes present varying levels of risk for sun exposure. The high-risk months are from April to September, with June, July, and August experiencing peak UV Index levels of 10, categorized as very high, where the burn time is dramatically reduced to just 15 minutes. In contrast, UV exposure is at its lowest during January and December, with an index of 2 and a burn time of 45 minutes. Visitors and residents are advised to use sun protection measures such as sunscreen, hats, and sunglasses during high-risk months, especially between April and September, to minimize skin damage and health risks associated with excessive UV exposure.

Monthly Maximum UV Index for Biratori, Japan

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

The table above highlights how UV exposure in Biratori 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.

Biratori'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
Biratori	2	3	5	8	9	10	10	10	8	6	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