September Weather in Killarney, Canada

Last updated: June 18, 2025

In September, the average temperature in Killarney, Canada hovers around 13°C (56°F), but be prepared for a range as low as -3°C (27°F) and peaking at 30°C (87°F). Expect 74 mm (2.9 in) of precipitation spread over about 10 days, creating a 73% average humidity that adds to the atmosphere.

September Temperature in Killarney

In September in Killarney, the average temperature is 13°C (56°F). Maximum temperatures can reach 30°C (87°F), while the minimum can drop as low as -3°C (27°F). Travelers should be prepared for a wide range of temperatures, making layering clothing a smart choice for this time of year.

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

The chart illustrates September temperature patterns in Killarney, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Killarney, September typically has an average temperature of 13°C (56°F), with highs reaching up to 30°C (87°F) and lows dropping to around -3°C (27°F).

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

September Precipitation in Killarney

In Killarney in September, the precipitation amount is 74 mm (2.9 in) spread over a period of 10 days.

September Precipitation Trends in Killarney

The chart displays monthly precipitation patterns in Killarney, 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 Killarney, September typically receives around 74 mm (2.9 inches) of precipitation spread over approximately 10 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Killarney

In Killarney in September humidity is 73%. With an average temperature of 13°C (56°F), this humidity feels like a cool, damp embrace that can be quite refreshing yet may require a light jacket for comfort while exploring the outdoors.

September Average Humidity in Killarney

This chart illustrates the average monthly humidity levels in Killarney, 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 Killarney is approximately 73%, 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 Killarney

In Killarney 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 Killarney.

Maximum UV Index Levels in Killarney for September

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

Data source: Killarney 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 Killarney Compares to Other Months

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

This table compares monthly weather conditions in Killarney, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-13°C (8°F)	15 mm (0.6 inches)	92%	low
February Weather	-15°C (5°F)	15 mm (0.6 inches)	90%	moderate
March Weather	-5°C (23°F)	27 mm (1.1 inches)	88%	moderate
April Weather	2°C (35°F)	26 mm (1.0 inches)	81%	very high
May Weather	11°C (52°F)	40 mm (1.6 inches)	74%	very high
June Weather	18°C (64°F)	87 mm (3.4 inches)	72%	very high
July Weather	20°C (68°F)	63 mm (2.5 inches)	74%	very high
August Weather	18°C (65°F)	70 mm (2.8 inches)	76%	very high
September Weather	13°C (56°F)	74 mm (2.9 inches)	73%	high
October Weather	4°C (40°F)	48 mm (1.9 inches)	76%	moderate
November Weather	-5°C (24°F)	29 mm (1.1 inches)	86%	low
December Weather	-10°C (15°F)	23 mm (0.9 inches)	91%	low