UV Index in Shimonoseki, Japan

Last updated: May 3, 2025

It's essential to stay aware of the UV Index in Shimonoseki, Japan, as it plays a crucial role in protecting your skin and overall health. Understanding UV levels is vital for preventing sunburn and minimizing long-term skin damage. Shimonoseki, with its humid subtropical climate, often experiences varying UV exposure throughout the day, peaking at an alarming UV Index of 11 around noon. By keeping an eye on these indices, residents and visitors alike can enjoy outdoor activities while prioritizing their skin safety.

Hourly UV Index in Shimonoseki

During the day, the UV Index experiences a significant rise, peaking at 11 around noon, indicating a strong potential for skin damage without protection. The morning starts relatively mild, with values of 2 at 7:00 AM, gradually increasing to 8 by 10:00 AM. As the sun reaches its zenith, the index hits its highest point, 10, at 11:00 AM, before slightly declining to 10 again at 1:00 PM. The afternoon sees a gradual decrease, dropping to 6 by 3:00 PM and continuing down to 1 by 6:00 PM. It's essential to be mindful of UV exposure during the peak hours between 11:00 AM and 2:00 PM, when protective measures are crucial for skin health.

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	5	moderate	30 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	1	low	45 min

Monthly UV Index Trends in Shimonoseki

As the seasons change, so do UV levels, with notable high-risk months spanning from March to August when the UV Index reaches very high to extreme levels, significantly lowering burn times to just 10-15 minutes. Visitors and residents alike should be particularly vigilant during these months, taking precautions such as wearing sunblock, protective clothing, and seeking shade to minimize skin damage. From September to November, the UV Index decreases, entering the moderate to high exposure categories, where burn times gradually increase to 25-30 minutes. Therefore, while UV exposure is less intense in the colder months, it remains important to stay informed and practice sun safety year-round, especially during the peak summer months.

Monthly Maximum UV Index for Shimonoseki, Japan

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

The table above highlights how UV exposure in Shimonoseki 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.

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