UV Index in Callahan, United States

Last updated: July 2, 2025

In Callahan, United States, staying aware of the UV Index is crucial for protecting your skin against harmful sun exposure. Understanding UV levels is essential not only for preventing sunburn but also for maintaining long-term skin health. With a Cfa climate characterized by warm summers, Callahan residents face significant UV exposure, particularly during midday hours when the index peaks at 11. By regularly checking the UV Index, you can make informed decisions to safeguard your skin and enjoy the beautiful sunny days safely.

Hourly UV Index in Callahan

The UV Index for the day showcases a dramatic increase in intensity as the sun climbs higher in the sky. Starting at a mild 1 at 07:00, it remains low throughout the morning, only reaching 3 by 09:00. However, by 11:00, the index skyrockets to 8, peaking at an intense 11 from 13:00 to 14:00. As the afternoon wanes, the UV levels gradually decrease, dropping to 4 by 17:00 and tapering off to 1 once again by 19:00. It's clear that midday hours pose the greatest risk for sun exposure, making it crucial to take precautions during the peak hours from 11:00 to 14:00.

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	1	low	45 min
09:00	3	moderate	30 min
10:00	5	moderate	30 min
11:00	8	very high	15 min
12:00	10	very high	15 min
13:00	11	extreme	10 min
14:00	11	extreme	10 min
15:00	10	very high	15 min
16:00	7	high	25 min
17:00	4	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Callahan

Throughout the year, the UV Index exhibits notable seasonal changes, with high-risk months primarily from March through August. Starting at a moderate level of 5 in January, the UV Index escalates to an extreme 11 from April to August, indicating the need for heightened sun protection. In these months, potential burn times drop to just 10 minutes. As summer transitions to fall, the index slightly declines but remains significant, peaking at 10 in September and 8 in October, with burn times of 15 minutes. In contrast, the UV Index decreases to high and moderate categories in November and December, respectively. Visitors and residents are advised to take precautions during the high-risk months by applying sunscreen, wearing protective clothing, and seeking shade, especially during peak hours to minimize the risk of sunburn and long-term skin damage.

Monthly Maximum UV Index for Callahan, United States

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

The table above highlights how UV exposure in Callahan compares to other major locations across United States. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.

Callahan's solar exposure compared to other cities in United States. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Chicago UVI	3	4	6	8	9	10	10	9	8	6	4	2
Brooklyn UVI	3	5	6	8	10	10	9	9	8	6	4	2
New York City UVI	3	5	6	8	10	10	9	9	8	6	4	2
Los Angeles UVI	4	6	8	9	10	11	11	10	10	7	5	4
Callahan	5	7	9	11	11	11	11	11	10	8	6	5
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5