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May Weather in Castro Marim, Portugal

Last updated: August 27, 2025

In Castro Marim, Portugal, the average temperature in May is a pleasant 20°C (68°F). Expect a range with minimums dropping to 8°C (47°F) and maximums soaring to 35°C (94°F). The month receives an average precipitation of 19 mm (0.8 in) over 4 days, contributing to a comfortable average humidity of 69%.

May Temperature in Castro Marim

In May in Castro Marim, the average temperature is 20°C (68°F). Maximums can reach 35°C (94°F) and minimums can be as low as 8°C (47°F). This moderate climate makes Castro Marim an ideal destination for travelers seeking pleasant weather and outdoor activities.

May Weather in Castro Marim: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Castro Marim, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castro Marim, May typically has an average temperature of 20°C (68°F), with highs reaching up to 35°C (94°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec515557616872777975685955
Data source: Temperature data for Castro Marim 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 Castro Marim

In Castro Marim in May, the precipitation amount is 19 mm (0.8 in) over a span of 4 days.

May Precipitation Trends in Castro Marim

The chart displays monthly precipitation patterns in Castro Marim, 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 Castro Marim, May typically receives around 19 mm (0.8 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec223854552052119255437
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Castro Marim

In Castro Marim in May, humidity is 69%. With an average temperature of 20°C (68°F), this humidity feels like walking through a warm, enveloping mist, making outdoor activities enjoyable yet a bit sticky, so it's best to stay hydrated and take breaks in the shade.

May Average Humidity in Castro Marim

This chart illustrates the average monthly humidity levels in Castro Marim, 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 Castro Marim is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%74%71%69%69%67%69%68%71%75%78%81%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Castro Marim

In Castro Marim in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Castro Marim.

Maximum UV Index Levels in Castro Marim for May

The chart shows the monthly maximum UV Index (UVI) for Castro Marim 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 Castro Marim typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101110109743
Data source: Castro Marim 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 Castro Marim Compares to Other Months

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

This table compares monthly weather conditions in Castro Marim, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (52°F)22 mm (0.9 inches)80%moderate
February Weather13°C (55°F)38 mm (1.5 inches)73%moderate
March Weather14°C (58°F)54 mm (2.1 inches)71%high
April Weather16°C (61°F)55 mm (2.2 inches)69%very high
May Weather20°C (68°F)19 mm (0.8 inches)69%very high
June Weather22°C (73°F)5 mm (0.2 inches)67%extreme
July Weather25°C (78°F)2 mm (0.1 inches)69%very high
August Weather26°C (79°F)1 mm (0.0 inches)68%very high
September Weather24°C (75°F)19 mm (0.8 inches)71%very high
October Weather20°C (68°F)25 mm (1.0 inches)75%high
November Weather15°C (59°F)54 mm (2.1 inches)78%moderate
December Weather13°C (55°F)37 mm (1.4 inches)81%moderate

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