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September Weather in Roscommon, Ireland

Last updated: August 23, 2025

In September, the average temperature in Roscommon, Ireland hovers around 13°C (56°F), with lows dipping to 2°C (36°F) and highs reaching a pleasant 25°C (77°F). Expect 80 mm (3.2 in) of precipitation spread over 15 days, contributing to a notably high average humidity of 88%. Be prepared for a mix of cozy and refreshing days!

September Temperature in Roscommon

In September in Roscommon, the average temperature is 13°C (56°F), with maximums reaching 25°C (77°F) and minimums dropping as low as 2°C (36°F). This climate makes Roscommon a great destination for travelers looking to enjoy mild weather and outdoor activities.

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

The chart illustrates September temperature patterns in Roscommon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Roscommon, 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 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec424344485357605956504643
Data source: Temperature data for Roscommon 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 Roscommon

In Roscommon in September, the total precipitation amount is 80 mm (3.2 in) spread over 15 days.

September Precipitation Trends in Roscommon

The chart displays monthly precipitation patterns in Roscommon, 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 Roscommon, September typically receives around 80 mm (3.2 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec7211796597790831328110897105
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Roscommon

In Roscommon 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 Roscommon

This chart illustrates the average monthly humidity levels in Roscommon, 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 Roscommon is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%87%86%83%83%85%85%88%91%92%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Roscommon

In Roscommon 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 Roscommon.

Maximum UV Index Levels in Roscommon for September

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

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

This table compares monthly weather conditions in Roscommon, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (42°F)72 mm (2.8 inches)88%low
February Weather6°C (43°F)117 mm (4.6 inches)88%low
March Weather7°C (44°F)96 mm (3.8 inches)87%moderate
April Weather9°C (48°F)59 mm (2.3 inches)86%moderate
May Weather12°C (53°F)77 mm (3.0 inches)83%high
June Weather14°C (57°F)90 mm (3.5 inches)83%very high
July Weather16°C (60°F)83 mm (3.3 inches)85%very high
August Weather15°C (59°F)132 mm (5.2 inches)85%high
September Weather13°C (56°F)80 mm (3.2 inches)88%moderate
October Weather10°C (51°F)108 mm (4.2 inches)91%moderate
November Weather8°C (46°F)97 mm (3.8 inches)92%low
December Weather6°C (44°F)105 mm (4.1 inches)89%low

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