UV Index in Okayama, Japan

Last updated: May 3, 2025

Understanding the UV Index is crucial for residents and visitors in Okayama, Japan, as it serves as a vital indicator of sun exposure risk throughout the day. Awareness of UV levels can significantly aid in sunburn prevention and overall skin health, helping you enjoy the sunny climate without the harmful effects of overexposure. Okayama, with its humid subtropical climate, often experiences elevated UV levels, particularly during peak hours between 11:00 AM and 1:00 PM, when the index can soar to a high of 11. Stay informed and protected to make the most of your time outdoors!

Hourly UV Index in Okayama

As the day unfolds, the UV Index experiences a significant rise, starting at a mild 2 by 07:00. By 09:00, it ramps up to a moderate 6, but the real peak hits at 12:00 with an intense 11, signaling the need for sun protection. The intensity slightly tapers off in the afternoon, dropping to 5 by 15:00, before retreating to a gentle 1 by 18:00. Finally, as the sun sets at 19:00, the UV Index fades away to 0—a clear reminder of how the sun’s rays can vary throughout the day. Stay vigilant and enjoy the sunshine responsibly!

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	5	moderate	30 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 Okayama

Throughout the year, UV exposure levels fluctuate significantly, with the highest risk months occurring from March through August, when the UV Index peaks at 11-12 and reaches an extreme exposure category, resulting in a burn time as short as 10 minutes. In contrast, the lowest risk months are January, December, and November, which present a moderate UV Index of 4-5 and allow for longer exposure times without risk of burning (30 minutes). Visitors and residents should remain vigilant during the high-risk months, employing protective measures such as sunscreen, protective clothing, and limiting direct sun exposure, especially during peak hours. It is crucial to stay aware of the changing UV Index to ensure safe enjoyment of outdoor activities year-round.

Monthly Maximum UV Index for Okayama, Japan

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

The table above highlights how UV exposure in Okayama 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.

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