September Weather in Irun, Spain

Last updated: August 27, 2025

In Irun, Spain, the average temperature in September hovers around 18°C (64°F), creating a pleasant atmosphere. However, you can expect a range, with minimums dipping to 7°C (44°F) and maximums soaring to 32°C (90°F). During this month, precipitation totals around 88 mm (3.5 in), spread over 12 days, contributing to an average humidity level of 75%, making for humid yet inviting conditions.

September Temperature in Irun

In September in Irun, the average temperature is 18°C (64°F). The maximum can reach 32°C (90°F), and the minimum can be as low as 7°C (44°F). This makes it an ideal time to enjoy a range of outdoor activities while ensuring you have layers for cooler evenings.

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

The chart illustrates September temperature patterns in Irun, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Irun, September typically has an average temperature of 18°C (64°F), with highs reaching up to 32°C (90°F) and lows dropping to around 7°C (44°F).

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

September Precipitation in Irun

In Irun in September, the precipitation amount is 88 mm (3.5 in) over a span of 12 days.

September Precipitation Trends in Irun

The chart displays monthly precipitation patterns in Irun, 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 Irun, September typically receives around 88 mm (3.5 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 Irun

In Irun in September, humidity is 75%. With an average temperature of 18°C (64°F), this humidity feels like a warm blanket enveloping you, making your travels a bit sticky and requiring frequent breaks in the shade to stay comfortable.

September Average Humidity in Irun

This chart illustrates the average monthly humidity levels in Irun, 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 Irun 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 Irun

In Irun 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 Irun.

Maximum UV Index Levels in Irun for September

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

Data source: Irun 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 Irun Compares to Other Months

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

This table compares monthly weather conditions in Irun, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (44°F)	135 mm (5.3 inches)	86%	low
February Weather	9°C (49°F)	121 mm (4.8 inches)	85%	moderate
March Weather	10°C (50°F)	122 mm (4.8 inches)	82%	high
April Weather	12°C (54°F)	111 mm (4.4 inches)	81%	high
May Weather	15°C (59°F)	131 mm (5.2 inches)	80%	very high
June Weather	18°C (64°F)	140 mm (5.5 inches)	81%	very high
July Weather	19°C (67°F)	96 mm (3.8 inches)	80%	very high
August Weather	20°C (67°F)	93 mm (3.7 inches)	76%	very high
September Weather	18°C (64°F)	88 mm (3.5 inches)	75%	high
October Weather	14°C (58°F)	127 mm (5.0 inches)	81%	moderate
November Weather	10°C (51°F)	170 mm (6.7 inches)	85%	moderate
December Weather	9°C (48°F)	199 mm (7.8 inches)	87%	low