UV Index in Castro Daire, Portugal

Last updated: August 1, 2025

Understanding the UV Index in Castro Daire, Portugal, is crucial for safeguarding your skin and overall health. With peak UV levels reaching a high of 10 during midday, awareness of these readings can help prevent sunburn and long-term skin damage. The mild Mediterranean climate typical of Castro Daire brings about significant sun exposure, making it essential for residents and visitors alike to stay informed. By keeping an eye on UV levels throughout the day, you can enjoy the beautiful outdoors while protecting yourself from harmful effects of the sun.

Hourly UV Index in Castro Daire

The UV Index for the day showcases a striking ascent in intensity, peaking during the afternoon hours. Starting from a low of 1 at 07:00 and 08:00, the index swiftly climbs to reach 3 by 09:00. By 10:00, it escalates to a moderate 5, but the real surge occurs between 11:00 and 14:00, hitting a maximum of 10—indicating a high risk of harm from unprotected sun exposure. As the day progresses, the UV Index gradually drops, retracting to 4 by 17:00 and further declining to 1 by 19:00. It's crucial to stay protected during those 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	1	low	45 min
08:00	1	low	45 min
09:00	2	low	45 min
10:00	4	moderate	30 min
11:00	6	high	25 min
12:00	8	very high	15 min
13:00	9	very high	15 min
14:00	9	very high	15 min
15:00	8	very high	15 min
16:00	6	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 Castro Daire

The UV Index shows a clear seasonal pattern, with increasing intensity from January to June and a gradual decline thereafter. March marks the transition to high risk, followed by extremely high levels in June (UV Index 11). April and May also present very high values (UV Index 9), making them critical months for sun exposure. From June to September, the UV Index remains predominantly in the very high category, indicating a heightened risk for sunburn and skin damage. Residents and visitors should take precautions, especially during April to September, by wearing protective clothing, applying sunscreen, and limiting time in direct sunlight, particularly during peak hours. As October and November roll in, UV levels decrease significantly, providing some relief, although it's still advisable to stay cautious with moderate UV levels in these months.

Monthly Maximum UV Index for Castro Daire, Portugal

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

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

Castro Daire's solar exposure compared to other cities in Portugal. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Braga UVI	2	4	6	8	9	11	10	9	8	6	4	2
Porto UVI	2	4	6	8	9	11	10	9	8	6	4	2
Castro Daire	3	4	6	9	9	11	10	9	8	6	4	2
Amadora UVI	3	5	6	9	10	11	10	9	8	6	4	3
Lisbon UVI	3	5	6	9	10	11	10	9	8	6	4	3
Setubal UVI	3	5	6	9	10	11	10	9	8	6	4	3