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May Weather in Castelo Branco, Portugal

Last updated: August 27, 2025

In Castelo Branco, Portugal, the average temperature for May is a comfortable 19°C (67°F). Expect minimums to dip to 4°C (39°F) and maximums soaring up to 35°C (95°F). During this month, the region typically sees a precipitation of 29 mm (1.2 in) across about 4 days, with an average humidity level of 70%.

May Temperature in Castelo Branco

In May in Castelo Branco, the average temperature is 19°C (67°F). Maximums can reach 35°C (95°F), and minimums can be as low as 4°C (39°F). This diverse temperature range makes Castelo Branco an ideal destination for travelers looking to enjoy both warm days and cool evenings.

May Weather in Castelo Branco: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Castelo Branco, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castelo Branco, May typically has an average temperature of 19°C (67°F), with highs reaching up to 35°C (95°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec465154586671777773645450
Data source: Temperature data for Castelo Branco generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Castelo Branco

In Castelo Branco in May, the total precipitation amount is 29 mm (1.2 in) spread over the course of 4 days.

May Precipitation Trends in Castelo Branco

The chart displays monthly precipitation patterns in Castelo Branco, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Castelo Branco, May typically receives around 29 mm (1.2 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec3350787529123333537665
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Castelo Branco

In Castelo Branco in May humidity is 70%. With an average temperature of 19°C (67°F), this humidity feels like a warm blanket wrapping around you, making traveling somewhat uncomfortable and sticky, as the air feels dense and every movement requires a bit more effort.

May Average Humidity in Castelo Branco

This chart illustrates the average monthly humidity levels in Castelo Branco, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Castelo Branco is approximately 70%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%75%72%70%70%63%60%60%68%74%83%85%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Castelo Branco

In Castelo Branco in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Castelo Branco.

Maximum UV Index Levels in Castelo Branco for May

The chart shows the monthly maximum UV Index (UVI) for Castelo Branco in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Castelo Branco typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689111098643
Data source: Castelo Branco May UVI data generated using 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.

How May Weather in Castelo Branco Compares to Other Months

Weather in Castelo Branco varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Castelo Branco, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Castelo Branco, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (47°F)33 mm (1.3 inches)85%moderate
February Weather11°C (52°F)50 mm (2.0 inches)75%moderate
March Weather12°C (54°F)78 mm (3.1 inches)72%high
April Weather15°C (58°F)75 mm (2.9 inches)70%very high
May Weather19°C (67°F)29 mm (1.2 inches)70%very high
June Weather22°C (72°F)12 mm (0.5 inches)63%extreme
July Weather25°C (77°F)3 mm (0.1 inches)60%very high
August Weather25°C (78°F)3 mm (0.1 inches)60%very high
September Weather23°C (73°F)33 mm (1.3 inches)67%very high
October Weather18°C (65°F)53 mm (2.1 inches)74%high
November Weather12°C (54°F)76 mm (3.0 inches)83%moderate
December Weather10°C (50°F)65 mm (2.6 inches)85%moderate

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