UV Index in Choshi, Japan

Last updated: July 2, 2025

In Choshi, Japan, being mindful of the UV Index is essential for safeguarding your skin and overall health. Understanding the daily fluctuations in UV levels can help you prevent sunburn and reduce your risk of long-term skin damage. Choshi's Cfa climate typically features warm summers and ample sunshine, making awareness of UV exposure particularly crucial. With peak UV Index values soaring to 11 around midday, residents and visitors alike must take proactive measures to enjoy the outdoors safely while protecting their skin from harmful rays.

Hourly UV Index in Choshi

The UV Index throughout the day reveals a dramatic rise in sun intensity, peaking at 11 around 11:00 AM and 12:00 PM. Starting from 07:00 AM with a low of 2, the index escalates rapidly, reaching 10 by 10:00 AM. As the sun climbs higher, it delivers its harshest rays, prompting caution for those outdoors. From 1:00 PM onward, the index gradually declines, hitting 5 at 3:00 PM, and finally tapering off to 0 by 7:00 PM. This profile highlights the importance of sun protection during the midday hours when UV exposure is most intense. Stay safe and protect your skin! 🌞

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	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 Choshi

Throughout the year, UV exposure varies significantly, with the highest levels occurring during the summer months. From March to August, the UV Index reaches a peak of 11 during May, June, and July, classified as extreme with a burn time of just 10 minutes. Notably, April and August also present very high levels, indicative of a higher risk for skin damage. Visitors and residents are advised to take extra precautions during these months by seeking shade, wearing protective clothing, and applying sunscreen frequently. Conversely, the risk is lower in the winter months, with the UV Index ranging from 3 to 5 from January to February and returning to similar levels in November and December. Awareness of these seasonal changes is crucial to ensure appropriate sun safety measures are taken year-round.

Monthly Maximum UV Index for Choshi, Japan

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

The table above highlights how UV exposure in Choshi 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.

Choshi'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
Choshi	3	5	8	10	11	11	11	10	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