September Weather in Castelnou, Spain

Last updated: August 27, 2025

In Castelnou, Spain, the average temperature in September is a pleasant 22°C (73°F), making it an inviting destination. However, temperatures can vary widely, with a minimum of 8°C (47°F) and a maximum of 36°C (97°F). Visitors can expect to encounter 21 mm (0.8 in) of precipitation over approximately 3 days of the month, while the average humidity hovers around 64%, ensuring a comfortable atmosphere throughout your stay.

September Temperature in Castelnou

In September in Castelnou, the average temperature is 22°C (73°F). Maximum temperatures can reach 36°C (97°F), while minimums can drop as low as 8°C (47°F). This makes Castelnou a great destination for travelers seeking mild weather during the day and cooler evenings.

September Weather in Castelnou: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Castelnou, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castelnou, September typically has an average temperature of 22°C (73°F), with highs reaching up to 36°C (97°F) and lows dropping to around 8°C (47°F).

Data source: Temperature data for Castelnou generated using information from the Copernicus Climate Change Service.

September Precipitation in Castelnou

In Castelnou in September, the precipitation amount is 21 mm (0.8 in) over a period of 3 days.

September Precipitation Trends in Castelnou

The chart displays monthly precipitation patterns in Castelnou, 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 Castelnou, September typically receives around 21 mm (0.8 inches) of precipitation spread over approximately 3 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Castelnou

In Castelnou in September humidity is 64%. With an average temperature of 22°C (73°F), this humidity feels like a warm embrace, making traveling comfortable yet slightly sticky, as you enjoy the vibrant sights while needing to stay hydrated.

September Average Humidity in Castelnou

This chart illustrates the average monthly humidity levels in Castelnou, 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 Castelnou is approximately 64%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Castelnou

In Castelnou 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 Castelnou.

Maximum UV Index Levels in Castelnou for September

The chart shows the monthly maximum UV Index (UVI) for Castelnou 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 Castelnou typically reaches 8, which falls under the very high exposure category.

Data source: Castelnou 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 Castelnou Compares to Other Months

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

This table compares monthly weather conditions in Castelnou, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (46°F)	38 mm (1.5 inches)	85%	moderate
February Weather	11°C (51°F)	16 mm (0.6 inches)	80%	moderate
March Weather	12°C (55°F)	29 mm (1.1 inches)	73%	high
April Weather	15°C (59°F)	60 mm (2.4 inches)	69%	very high
May Weather	20°C (68°F)	34 mm (1.3 inches)	64%	very high
June Weather	24°C (76°F)	28 mm (1.1 inches)	59%	extreme
July Weather	27°C (81°F)	12 mm (0.5 inches)	58%	extreme
August Weather	27°C (81°F)	13 mm (0.5 inches)	58%	very high
September Weather	22°C (73°F)	21 mm (0.8 inches)	64%	very high
October Weather	17°C (63°F)	36 mm (1.4 inches)	76%	high
November Weather	11°C (53°F)	50 mm (2.0 inches)	82%	moderate
December Weather	9°C (49°F)	25 mm (1.0 inches)	84%	low