UV Index in Hakuba, Japan

Last updated: June 2, 2025

Understanding the UV Index in Hakuba, Japan is crucial for protecting your skin and overall health. With UV levels peaking between 11:00 AM and 1:00 PM at a striking 11, awareness of these measurements can help you avoid painful sunburn and long-term skin damage. Given its Dfb climate, Hakuba experiences unique sun exposure risks throughout the year, especially during the sunny months. By staying informed about the UV Index, you can enjoy the beautiful outdoor activities this stunning region has to offer while ensuring your skin remains safe and healthy.

Hourly UV Index in Hakuba

The UV Index today reveals a sharp rise in ultraviolet radiation as the morning progresses. Starting at a mild level of 2 at 07:00, the index escalates to 4 by 08:00. As the sun reaches its peak, expect a staggering 11 at 11:00 and 12:00, marking the hottest part of the day. After reaching this zenith, the UV levels gradually decline, dropping to 8 at 14:00 and then further down to 1 by 18:00. Finally, by 19:00, the UV Index tapers off to a reassuring 0. It’s crucial to protect yourself during the peak hours—between 10:00 and 14:00—when the UV Index is at its highest!

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	7	high	25 min
10:00	10	very high	15 min
11:00	11	extreme	10 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 Hakuba

Throughout the year, UV exposure experiences significant variation, with the highest risks occurring during the spring and summer months. Notably, March to August sees an escalated UV Index, peaking at 11 from May through August, corresponding to an extreme category with a burn time of just 10 minutes. These months are particularly critical for minimizing sun exposure; residents and visitors should take extra precautions, such as wearing protective clothing, applying sunscreen, and seeking shade during peak hours. As summer transitions to fall, the UV index gradually decreases, with September and October still presenting very high and high risks, respectively. The safer months of November and December return to a moderate risk level, reminding everyone to remain vigilant about sun safety year-round.

Monthly Maximum UV Index for Hakuba, Japan

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

The table above highlights how UV exposure in Hakuba 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.

Hakuba'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
Hakuba	4	6	9	10	11	11	11	11	10	7	5	4
Osaka UVI	4	6	8	11	11	11	12	11	10	7	5	3