UV Index in Rankoshimachi, Japan

Last updated: May 3, 2025

In Rankoshimachi, Japan, staying informed about the UV Index is crucial for protecting your skin and overall health. Understanding UV levels can help prevent sunburn and reduce the risk of long-term skin damage, especially during the high UV hours from 10 AM to 2 PM, when the index peaks at 9. Given Rankoshimachi’s Dfb climate, where seasons can bring both sunny days and increased UV exposure, being aware of these levels is essential for enjoying the outdoors safely. Whether you’re gardening, hiking, or simply soaking up the sun, knowing the UV Index empowers you to take the right precautions for your skin’s health.

Hourly UV Index in Rankoshimachi

As the sun rises, the UV Index begins its ascent, peaking at 11:00 AM and 12:00 PM with a blistering 9. The day starts gently, with 07:00 AM registering a modest 2, but by 09:00 AM, it climbs to a moderate 6. The intensity escalates, hitting 8 at 10:00 AM and reaching its zenith shortly after noon. After this peak, the index gradually dips, easing down to 6 by 2:00 PM, before falling further to 4 at 3:00 PM. As evening approaches, the UV radiation wanes significantly, dropping to 2 by 4:00 PM and near zero after sunset, signaling a shift in the skies. Remember to 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	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	8	very high	15 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 Rankoshimachi

As the seasons change, so does the UV Index, indicating varying levels of sun exposure risk throughout the year. The high-risk months are primarily from May to September, where the UV Index peaks at 10, falling within the very high exposure category, necessitating a burn time of just 15 minutes. In contrast, January and December experience low UV levels with an index of 2, allowing for a safer burn time of 45 minutes. Residents and visitors should take extra precautions during the high-risk months by wearing sunscreen, protective clothing, and seeking shade during peak sun hours to minimize their risk of skin damage. In the cooler months, while the risk is lower, remaining vigilant is still advised to ensure overall skin health.

Monthly Maximum UV Index for Rankoshimachi, Japan

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

The table above highlights how UV exposure in Rankoshimachi 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.

Rankoshimachi'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
Rankoshimachi	2	3	6	7	9	10	10	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