UV Index in Onomichi, Japan

Last updated: May 3, 2025

Being aware of the UV Index is essential for residents and visitors of Onomichi, Japan, a picturesque city known for its lush landscapes and maritime charm. Understanding UV levels is crucial for protecting your skin from harmful sun exposure and preventing painful sunburn, which can lead to long-term health issues. Onomichi's Cfa climate means warm summers, where UV radiation can peak significantly during midday—reaching as high as 11 around noon. This highlights the importance of staying informed about UV levels to safeguard your skin and enjoy the beautiful outdoors without compromise.

Hourly UV Index in Onomichi

The UV Index early in the day starts off modest, peaking at 2 by 07:00 and climbing to a moderate 3 by 08:00. By 09:00, it surges to a robust 6, indicating increasing sun intensity. The heat reaches its zenith at 12:00, hitting an impressive 11, showing that midday is the prime time for sun exposure. As the afternoon progresses, the UV Index gradually declines, falling to 10 at 13:00, then to 8 by 14:00. By late afternoon, 15:00 sees it drop to 6, and as the sun sets, the index continues to taper off, descending to 3 by 16:00, and eventually settling at a low 0 by 19:00. It’s a day that underscores the importance of sun protection during peak hours, especially around noon.

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	3	moderate	30 min
09:00	6	high	25 min
10:00	8	very high	15 min
11:00	10	very high	15 min
12:00	11	extreme	10 min
13:00	10	very high	15 min
14:00	8	very high	15 min
15:00	6	high	25 min
16:00	3	moderate	30 min
17:00	2	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Onomichi

The UV Index experiences significant seasonal fluctuations, peaking between May and August, where an extreme rating of 11 to 12 indicates a burn time of just 10 minutes. March and April also see heightened levels, categorized as very high with a burn time of 15 minutes. Conversely, the UV Index is at its lowest during January, February, and December, marked as moderate, allowing for a safer 30-minute exposure before risking sunburn. The highest-risk months for UV exposure are May to August, necessitating strong sun protection measures for visitors and residents alike. It is essential to wear sunscreen, protective clothing, and sunglasses, especially during peak hours, to minimize the risk of UV-related health issues.

Monthly Maximum UV Index for Onomichi, Japan

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

The table above highlights how UV exposure in Onomichi 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.

Onomichi'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
Nagoya UVI	4	6	8	10	11	11	11	11	10	7	5	3
Onomichi	4	5	8	10	11	11	12	12	10	7	6	4
Osaka UVI	4	6	8	11	11	11	12	11	10	7	5	3