nomadseason

September Weather in Castelo Branco, Portugal

Last updated: August 27, 2025

In September, the average temperature in Castelo Branco, Portugal is a pleasant 22°C (72°F). You can expect a minimum of 19°C (66°F) and a maximum of 25°C (77°F), making it a comfortable time to visit. However, be prepared for some rain, as 57 mm (2.2 in) of precipitation can occur over 11 days. The air will feel quite moist, with an average humidity of 83%, contributing to the region's unique climate.

September Temperature in Castelo Branco

In September in Castelo Branco, the average temperature is 22°C (72°F), with maximums reaching 25°C (77°F) and minimums dropping to 19°C (66°F). This mild climate makes it an ideal time for outdoor activities and exploration.

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

The chart illustrates September 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, September typically has an average temperature of 22°C (72°F), with highs reaching up to 25°C (77°F) and lows dropping to around 19°C (66°F).
JanFebMarAprMayJunJulAugSepOctNovDec615959606266707272696563
Data source: Temperature data for Castelo Branco generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Castelo Branco

In Castelo Branco in September, the precipitation amount is 57 mm (2.2 in) spread over 11 days.

September Precipitation Trends in Castelo Branco

The chart displays monthly precipitation patterns in Castelo Branco, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Castelo Branco, September typically receives around 57 mm (2.2 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec91796375633827585774124108
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Castelo Branco

In Castelo Branco in September humidity is 83%. With average temperature 22°C (72°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities challenging and prompting travelers to seek shade or frequent stops for hydration.

September Average Humidity in Castelo Branco

This chart illustrates the average monthly humidity levels in Castelo Branco, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Castelo Branco is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%85%85%83%85%86%83%83%79%80%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Castelo Branco

In Castelo Branco in September, 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 September

The chart shows the monthly maximum UV Index (UVI) for Castelo Branco in September, 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 September, the maximum UV index in Castelo Branco typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101110109743
Data source: Castelo Branco September 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 September 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 September’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 September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather16°C (61°F)90 mm (3.6 inches)84%moderate
February Weather15°C (59°F)79 mm (3.1 inches)83%moderate
March Weather15°C (60°F)63 mm (2.5 inches)85%high
April Weather15°C (60°F)75 mm (3.0 inches)85%very high
May Weather17°C (62°F)63 mm (2.5 inches)83%very high
June Weather19°C (66°F)38 mm (1.5 inches)85%extreme
July Weather21°C (70°F)27 mm (1.1 inches)86%very high
August Weather22°C (73°F)58 mm (2.3 inches)83%very high
September Weather22°C (72°F)57 mm (2.2 inches)83%very high
October Weather20°C (69°F)74 mm (2.9 inches)79%high
November Weather18°C (65°F)124 mm (4.9 inches)80%moderate
December Weather17°C (63°F)108 mm (4.3 inches)85%moderate

Compare Castelo Branco's Climate with Cities Worldwide