UV Index in Sapporo, Japan

Last updated: May 3, 2025

Understanding the UV Index in Sapporo, Japan is crucial for maintaining skin health and preventing sunburn. With a climate classified as Dfb, Sapporo experiences seasonal variations that can affect UV exposure levels, particularly during the summer months when the index peaks around midday. The day’s highest UV Index of 9 at 11:00 AM signals a high risk of harm from unprotected sun exposure, making it essential for residents and visitors alike to take precautions. By being aware of UV levels, you can enjoy the beautiful outdoor scenery of Sapporo while protecting your skin against potential damage.

Hourly UV Index in Sapporo

The UV Index (UVI) starts the day at a mild level of 2 at 7:00 AM, gradually climbing to a peak of 9 by 11:00 AM, signaling a strong need for sun protection. As the day progresses to 12:00 PM, it dips slightly to 8, maintaining a high risk of UV exposure. Early afternoon sees the UVI begin to lower, reaching 7 at 1:00 PM and tapering off to 4 by 3:00 PM. As daylight wanes, the index drops to 2 by 4:00 PM, before settling at a minimal 1 in the evening hours, providing a welcome relief as the sun sets at 7:00 PM, where the UVI finally falls to 0. Be sure to take precautions during the peak hours to safeguard 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	4	moderate	30 min
09:00	6	high	25 min
10:00	8	very high	15 min
11:00	9	very high	15 min
12:00	8	very high	15 min
13:00	7	high	25 min
14:00	6	high	25 min
15:00	4	moderate	30 min
16:00	2	low	45 min
17:00	1	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Sapporo

Throughout the year, the UV Index experiences notable seasonal changes, indicating varying levels of sun exposure risk. The high-risk months typically occur from May to August, when the UV Index reaches very high levels (9-10), warranting caution as the burn time decreases to just 15 minutes. In contrast, the winter months of December and January present a much lower risk, with UV indexes of 2 and burn times extending to 45 minutes. Visitors and residents are advised to take appropriate precautions during the high-risk months, such as wearing protective clothing, applying broad-spectrum sunscreen, and seeking shade during peak sun hours to minimize potential skin damage. For the moderate months of February, April, October, and November, it’s important to remain aware of UV exposure and adjust outdoor activities accordingly.

Monthly Maximum UV Index for Sapporo, Japan

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

The table above highlights how UV exposure in Sapporo 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.

Sapporo'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	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