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September Weather in Cavan, Ireland

Last updated: August 23, 2025

In September, the average temperature in Cavan, Ireland hovers around 13°C (56°F). You can expect a minimum chill of 2°C (35°F) and a warm maximum reaching 24°C (76°F). With 73 mm (2.9 in) of precipitation spread over 14 days, it’s wise to keep an umbrella handy. The weather also brings high humidity levels of around 86%, adding to the overall cozy climate.

September Temperature in Cavan

In September in Cavan, the average temperature is 13°C (56°F). The maximum can reach 24°C (76°F), while the minimum can drop to as low as 2°C (35°F). It’s advisable to pack layers to stay comfortable while exploring, as the weather can vary significantly throughout the day.

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

The chart illustrates September temperature patterns in Cavan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cavan, September typically has an average temperature of 13°C (56°F), with highs reaching up to 24°C (76°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec424244475257605955504543
Data source: Temperature data for Cavan generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Cavan

In Cavan in September, the total precipitation amount is 73 mm (2.9 in) over the course of 14 days.

September Precipitation Trends in Cavan

The chart displays monthly precipitation patterns in Cavan, 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 Cavan, September typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec6196865270888212173858893
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Cavan

In Cavan in September, humidity is 86%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket enveloping you, making outdoor activities slightly uncomfortable and prompting travelers to seek shade or air-conditioned spaces frequently.

September Average Humidity in Cavan

This chart illustrates the average monthly humidity levels in Cavan, 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 Cavan is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%86%85%83%85%86%85%86%87%87%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Cavan

In Cavan 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 Cavan.

Maximum UV Index Levels in Cavan for September

The chart shows the monthly maximum UV Index (UVI) for Cavan 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 Cavan typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875321
Data source: Cavan 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 Cavan Compares to Other Months

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

This table compares monthly weather conditions in Cavan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)61 mm (2.4 inches)85%low
February Weather6°C (43°F)96 mm (3.8 inches)86%low
March Weather7°C (44°F)85 mm (3.4 inches)86%moderate
April Weather8°C (47°F)52 mm (2.0 inches)85%moderate
May Weather11°C (53°F)69 mm (2.7 inches)83%high
June Weather14°C (57°F)88 mm (3.5 inches)85%very high
July Weather16°C (60°F)81 mm (3.2 inches)86%very high
August Weather15°C (59°F)121 mm (4.8 inches)85%high
September Weather13°C (56°F)73 mm (2.9 inches)86%moderate
October Weather10°C (51°F)85 mm (3.3 inches)87%moderate
November Weather7°C (46°F)88 mm (3.5 inches)86%low
December Weather6°C (43°F)93 mm (3.7 inches)84%low

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