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September Weather in Claregalway, Ireland

Last updated: August 23, 2025

In September, the average temperature in Claregalway, Ireland hovers around 13°C (56°F). Expect a chilly minimum of 1°C (34°F) and a comfortable maximum of 26°C (80°F). Be prepared for 82 mm (3.2 in) of precipitation spread over 14 days, making it a rather wet period, and don't forget to brace yourself for an average humidity of 88%.

September Temperature in Claregalway

In September in Claregalway, the average temperature is 13°C (56°F). Maximum temperatures can reach 26°C (80°F), while minimums can drop as low as 1°C (34°F). Be prepared for a range of weather conditions if you're planning to travel!

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

The chart illustrates September temperature patterns in Claregalway, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Claregalway, September typically has an average temperature of 13°C (56°F), with highs reaching up to 26°C (80°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec434445485357605956514645
Data source: Temperature data for Claregalway 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 Claregalway

In Claregalway in September, the precipitation amount is 82 mm (3.2 in) spread over 14 days.

September Precipitation Trends in Claregalway

The chart displays monthly precipitation patterns in Claregalway, 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 Claregalway, September typically receives around 82 mm (3.2 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec77127104637183851238211394110
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Claregalway

In Claregalway 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 Claregalway

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

In Claregalway 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 Claregalway.

Maximum UV Index Levels in Claregalway for September

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

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

This table compares monthly weather conditions in Claregalway, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)77 mm (3.0 inches)88%low
February Weather6°C (44°F)127 mm (5.0 inches)88%low
March Weather7°C (45°F)104 mm (4.1 inches)87%moderate
April Weather9°C (49°F)63 mm (2.5 inches)86%moderate
May Weather12°C (53°F)70 mm (2.8 inches)83%high
June Weather14°C (57°F)83 mm (3.3 inches)83%very high
July Weather16°C (60°F)85 mm (3.4 inches)85%very high
August Weather15°C (59°F)122 mm (4.8 inches)85%high
September Weather13°C (56°F)82 mm (3.2 inches)88%moderate
October Weather11°C (51°F)113 mm (4.4 inches)91%moderate
November Weather8°C (47°F)94 mm (3.7 inches)92%low
December Weather7°C (45°F)110 mm (4.3 inches)89%low

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