UV Index in Hayakawa, Japan

Last updated: June 2, 2025

In Hayakawa, Japan, understanding the UV Index is essential for safeguarding your skin and overall health. With UV levels peaking at a staggering 12 around noon, awareness is crucial to prevent sunburn and long-term skin damage. The Dfb climate typical of Hayakawa brings warm summers with elevated UV risks, making it imperative to stay informed about daily UV fluctuations. By familiarizing yourself with the UV Index, you can enjoy outdoor activities while ensuring your skin stays protected from harmful ultraviolet rays.

Hourly UV Index in Hayakawa

The UV Index today starts off relatively mild, peaking at 3 by 07:00. As the sun rises higher, the intensity escalates to 5 at 08:00, reaching a significant 8 by 09:00. The intensity continues to climb and hits a maximum of 12 at 12:00, prompting caution for outdoor activities. 11 at 11:00 and 10 at 13:00 keep the UV levels high, before they start to taper off. By 15:00, it drops to 6, then quickly declines to 3 by 16:00. The sun's retreat is apparent as the index falls to 2 at 17:00 and ultimately settles at a low 0 by 19:00, making the evening hours safe for all. Stay sun-smart and protect your skin during peak hours!

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	3	moderate	30 min
08:00	5	moderate	30 min
09:00	8	very high	15 min
10:00	10	very high	15 min
11:00	11	extreme	10 min
12:00	12	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 Hayakawa

Throughout the year, the UV Index demonstrates significant seasonal variations, highlighting the importance of sun protection during peak months. From March to August, the UV Index reaches its highest levels, peaking at 12 in June, July, and August, which falls under the extreme exposure category with a burn time of just 10 minutes. This indicates that March through August are the high-risk months for UV exposure, particularly April and May, which see indices of 10 and 11 respectively. Residents and visitors are advised to take extra precautions during these months, including wearing sunscreen, protective clothing, and seeking shade, especially during the midday hours. As the year progresses into the autumn and winter months, UV levels decrease, but awareness should still be maintained in February, October, and November, where the UV Index remains in the high range.

Monthly Maximum UV Index for Hayakawa, Japan

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

The table above highlights how UV exposure in Hayakawa 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.

Hayakawa'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
Hayakawa	4	7	9	10	11	12	12	12	10	7	6	4