UV Index in Miyakojima, Japan

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents and visitors in Miyakojima, Japan, a tropical paradise known for its stunning beaches and vibrant marine life. With UV levels often soaring to a maximum of 13, awareness of these radiation levels can significantly impact sunburn prevention and overall skin health. As this enchanting island experiences a Cfa climate, characterized by hot summers and mild winters, the risk of overexposure to harmful UV rays is ever-present. Stay informed and protect yourself by monitoring the UV Index to enjoy all that Miyakojima has to offer while keeping your skin safe!

Hourly UV Index in Miyakojima

The UV Index for the day starts off mild, peaking at 1 at 7:00 AM, and gradually increases to a moderate level of 2 by 8:00 AM. As the sun climbs higher, the intensity rises sharply, reaching its maximum of 13 at 12:00 PM and sustaining this level until 1:00 PM, indicating a significant risk for sun exposure. Post noon, the UV Index begins to decline, dropping to 9 by 3:00 PM and further tapering off to a gentle 3 at 5:00 PM. By 6:00 PM, it settles back to a comfortable 1, perfect for evening strolls. This pattern highlights the importance of seeking shade and protection during the peak hours, especially between 11:00 AM and 1:00 PM when the UV radiation is 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	1	low	45 min
08:00	2	low	45 min
09:00	5	moderate	30 min
10:00	8	very high	15 min
11:00	11	extreme	10 min
12:00	13	extreme	10 min
13:00	13	extreme	10 min
14:00	12	extreme	10 min
15:00	9	very high	15 min
16:00	5	moderate	30 min
17:00	3	moderate	30 min
18:00	1	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Miyakojima

Throughout the year, the UV Index shows significant seasonal changes, peaking during the summer months. From January to December, the highest UV readings occur from March to September, reaching an extreme level of 13. Particularly, May through September are categorized as high-risk months, with minimal safe exposure times of just 10 minutes. In contrast, the UV Index decreases to 7 in both January and December, indicating a transition to high exposure but with a more manageable burn time of 25 minutes. Visitors and residents are strongly advised to take precautions during the high-risk months, including wearing protective clothing, applying sunscreen regularly, and limiting sun exposure, especially between 10 a.m. and 4 p.m. to reduce the risk of skin damage.

Monthly Maximum UV Index for Miyakojima, Japan

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

The table above highlights how UV exposure in Miyakojima 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.

Miyakojima'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
Miyakojima	7	10	12	12	13	13	13	13	13	10	9	7