September Weather in Knock, Ireland

Last updated: August 23, 2025

In September, the average temperature in Knock, Ireland hovers around 13°C (56°F). Visitors can expect a range, with minimums dipping to 1°C (35°F) and maximums reaching up to 25°C (77°F). Be prepared for 84 mm (3.3 in) of precipitation over approximately 16 days, accompanied by a notably high average humidity of 88%.

September Temperature in Knock

In September in Knock, the average temperature is 13°C (56°F). Maximum temperatures can reach 25°C (77°F), while minimums can drop to as low as 1°C (35°F). It's a great time to visit for those who enjoy mild weather and comfortable outdoor activities.

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

The chart illustrates September temperature patterns in Knock, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Knock, September typically has an average temperature of 13°C (56°F), with highs reaching up to 25°C (77°F) and lows dropping to around 1°C (35°F).

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

September Precipitation in Knock

In Knock in September, the total precipitation amount is 84 mm (3.3 in) spread over 16 days.

September Precipitation Trends in Knock

The chart displays monthly precipitation patterns in Knock, 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 Knock, September typically receives around 84 mm (3.3 inches) of precipitation spread over approximately 16 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 Knock

In Knock in September, humidity is 88%. With an average temperature of 13°C (56°F), this humidity feels like a thick, warm blanket wrapping around you, making outdoor adventures sticky and challenging.

September Average Humidity in Knock

This chart illustrates the average monthly humidity levels in Knock, 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 Knock is approximately 88%, 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 Knock

In Knock in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Knock.

Maximum UV Index Levels in Knock for September

The chart shows the monthly maximum UV Index (UVI) for Knock 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 Knock typically reaches 5, which falls under the moderate exposure category.

Data source: Knock 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 Knock Compares to Other Months

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

This table compares monthly weather conditions in Knock, 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 (43°F)	79 mm (3.1 inches)	88%	low
February Weather	6°C (43°F)	129 mm (5.1 inches)	88%	low
March Weather	7°C (44°F)	104 mm (4.1 inches)	87%	moderate
April Weather	9°C (48°F)	65 mm (2.6 inches)	86%	moderate
May Weather	11°C (53°F)	76 mm (3.0 inches)	83%	high
June Weather	14°C (57°F)	86 mm (3.4 inches)	83%	very high
July Weather	15°C (60°F)	85 mm (3.3 inches)	85%	very high
August Weather	15°C (59°F)	132 mm (5.2 inches)	85%	high
September Weather	13°C (56°F)	84 mm (3.3 inches)	88%	moderate
October Weather	10°C (51°F)	120 mm (4.7 inches)	91%	moderate
November Weather	8°C (46°F)	105 mm (4.1 inches)	92%	low
December Weather	7°C (44°F)	110 mm (4.3 inches)	89%	low