September Weather in Gaztelu, Spain

Last updated: August 27, 2025

In Gaztelu, Spain, the average temperature in September hovers around 17°C (62°F). During this time, temperatures can fluctuate, with a minimum of 4°C (39°F) and a peak maximum of 31°C (89°F). Be prepared for a bit of wet weather, as precipitation can reach up to 71 mm (2.8 in) over 12 days, accompanied by an average humidity level of 75%.

September Temperature in Gaztelu

In September in Gaztelu, the average temperature is 17°C (62°F). Maximums can reach 31°C (89°F) and minimums can be as low as 4°C (39°F). This means travelers should be prepared for both warm and cool weather during their visit.

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

The chart illustrates September temperature patterns in Gaztelu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Gaztelu, September typically has an average temperature of 17°C (62°F), with highs reaching up to 31°C (89°F) and lows dropping to around 4°C (39°F).

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

September Precipitation in Gaztelu

In Gaztelu in September, the precipitation amount is 71 mm (2.8 in) during a total of 12 days.

September Precipitation Trends in Gaztelu

The chart displays monthly precipitation patterns in Gaztelu, 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 Gaztelu, September typically receives around 71 mm (2.8 inches) of precipitation spread over approximately 12 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 Gaztelu

In Gaztelu in September, humidity is 75%. With an average temperature of 17°C (62°F), this humidity feels like a warm, muggy embrace that can leave travelers feeling sticky and a bit sluggish as they navigate the sights.

September Average Humidity in Gaztelu

This chart illustrates the average monthly humidity levels in Gaztelu, 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 Gaztelu is approximately 75%, 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 Gaztelu

In Gaztelu in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Gaztelu.

Maximum UV Index Levels in Gaztelu for September

The chart shows the monthly maximum UV Index (UVI) for Gaztelu 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 Gaztelu typically reaches 7, which falls under the high exposure category.

Data source: Gaztelu 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 Gaztelu Compares to Other Months

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

This table compares monthly weather conditions in Gaztelu, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (40°F)	115 mm (4.5 inches)	86%	low
February Weather	7°C (45°F)	103 mm (4.0 inches)	85%	moderate
March Weather	8°C (47°F)	113 mm (4.4 inches)	82%	high
April Weather	10°C (51°F)	109 mm (4.3 inches)	81%	high
May Weather	13°C (56°F)	109 mm (4.3 inches)	80%	very high
June Weather	17°C (62°F)	133 mm (5.2 inches)	81%	very high
July Weather	18°C (65°F)	73 mm (2.9 inches)	80%	very high
August Weather	19°C (66°F)	80 mm (3.1 inches)	76%	very high
September Weather	17°C (62°F)	71 mm (2.8 inches)	75%	high
October Weather	13°C (55°F)	112 mm (4.4 inches)	81%	moderate
November Weather	8°C (47°F)	138 mm (5.4 inches)	85%	moderate
December Weather	6°C (44°F)	156 mm (6.1 inches)	87%	low