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September Weather in Castelo Branco, Portugal

Last updated: August 27, 2025

In September, the average temperature in Castelo Branco, Portugal is a pleasant 23°C (73°F), with a minimum of 10°C (50°F) and a maximum reaching up to 37°C (98°F). Expect about 33 mm (1.3 in) of precipitation over 3 days, paired with an average humidity of 67%. Enjoy the warm weather while staying prepared for occasional showers!

September Temperature in Castelo Branco

In September in Castelo Branco, the average temperature is 23°C (73°F). Maximums can reach 37°C (98°F) and minimums can be as low as 10°C (50°F). It's a great time to visit, as the weather offers a warm climate ideal for both outdoor activities and relaxation.

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 23°C (73°F), with highs reaching up to 37°C (98°F) and lows dropping to around 10°C (50°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.

September Precipitation in Castelo Branco

In Castelo Branco in September, the precipitation amount is 33 mm (1.3 in) over the course of 3 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 33 mm (1.3 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec3350787529123333537665
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Castelo Branco

In Castelo Branco in September humidity is 67%. With an average temperature of 23°C (73°F), this humidity feels like a warm, enveloping blanket that makes the air feel thick and slightly sticky, which can be challenging for travelers who prefer cooler, drier conditions.

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 67%, 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 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 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689111098643
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 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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