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September Weather in Millstreet, Ireland

Last updated: August 23, 2025

In September, the average temperature in Millstreet, Ireland is a mild 13°C (55°F), with a minimum dipping to 0°C (33°F) and a maximum reaching 25°C (77°F). Expect about 79 mm (3.1 in) of precipitation over 13 days, contributing to an average humidity level of 85%. Don't forget your umbrella! ☔️

September Temperature in Millstreet

In September in Millstreet, the average temperature is 13°C (55°F), with maximums reaching 25°C (77°F) and minimums dropping as low as 0°C (33°F). It's a great time to pack layers for your travels, as the weather can vary significantly throughout the day.

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

The chart illustrates September temperature patterns in Millstreet, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Millstreet, September typically has an average temperature of 13°C (55°F), with highs reaching up to 25°C (77°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec424343475156605855504544
Data source: Temperature data for Millstreet 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 Millstreet

In Millstreet in September, the precipitation amount is 79 mm (3.1 in) over a span of 13 days.

September Precipitation Trends in Millstreet

The chart displays monthly precipitation patterns in Millstreet, 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 Millstreet, September typically receives around 79 mm (3.1 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec69121100828571691057910787114
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Millstreet

In Millstreet in September, humidity is 85%. With an average temperature of 13°C (55°F), this humidity feels like a heavy blanket wrapping around you, making even short walks feel exhausting and urging travelers to seek shade and refreshment frequently.

September Average Humidity in Millstreet

This chart illustrates the average monthly humidity levels in Millstreet, 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 Millstreet is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%85%84%84%84%85%85%84%85%86%84%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Millstreet

In Millstreet 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 Millstreet.

Maximum UV Index Levels in Millstreet for September

The chart shows the monthly maximum UV Index (UVI) for Millstreet 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 Millstreet typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124678875421
Data source: Millstreet 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 Millstreet Compares to Other Months

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

This table compares monthly weather conditions in Millstreet, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)69 mm (2.7 inches)83%low
February Weather6°C (43°F)121 mm (4.7 inches)85%low
March Weather6°C (43°F)100 mm (3.9 inches)84%moderate
April Weather8°C (47°F)82 mm (3.2 inches)84%high
May Weather11°C (52°F)85 mm (3.3 inches)84%high
June Weather13°C (56°F)71 mm (2.8 inches)85%very high
July Weather15°C (60°F)69 mm (2.7 inches)85%very high
August Weather15°C (58°F)105 mm (4.1 inches)84%high
September Weather13°C (55°F)79 mm (3.1 inches)85%moderate
October Weather10°C (50°F)107 mm (4.2 inches)86%moderate
November Weather7°C (45°F)87 mm (3.4 inches)84%low
December Weather6°C (44°F)114 mm (4.5 inches)83%low

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