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September Weather in Roundwood, Ireland

Last updated: August 23, 2025

In September, the average temperature in Roundwood, Ireland hovers around 13°C (55°F), with comfortable highs reaching 22°C (73°F) and cooler lows dipping to 1°C (35°F). Expect 81 mm (3.2 in) of precipitation spread over 14 days, coupled with an average humidity level of 86%, making it a month where layers and umbrellas may come in handy!

September Temperature in Roundwood

In September in Roundwood, the average temperature is 13°C (55°F), with maximums reaching up to 22°C (73°F) and minimums dropping as low as 1°C (35°F). It's a great time to visit if you enjoy mild weather with the potential for both warm days and cooler nights.

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

The chart illustrates September temperature patterns in Roundwood, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Roundwood, September typically has an average temperature of 13°C (55°F), with highs reaching up to 22°C (73°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec414243465156605955504543
Data source: Temperature data for Roundwood 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 Roundwood

In Roundwood in September, the precipitation amount is 81 mm (3.2 in) over a span of 14 days.

September Precipitation Trends in Roundwood

The chart displays monthly precipitation patterns in Roundwood, 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 Roundwood, September typically receives around 81 mm (3.2 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec619490588381851108193111111
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Roundwood

In Roundwood in September humidity is 86%. With an average temperature of 13°C (55°F), this humidity feels like a damp blanket clinging to your skin, making travel quite uncomfortable and urging you to seek cooler, dryer spots.

September Average Humidity in Roundwood

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

In Roundwood 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 Roundwood.

Maximum UV Index Levels in Roundwood for September

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

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

This table compares monthly weather conditions in Roundwood, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)61 mm (2.4 inches)85%low
February Weather6°C (42°F)94 mm (3.7 inches)86%low
March Weather6°C (43°F)90 mm (3.5 inches)86%moderate
April Weather8°C (46°F)57 mm (2.3 inches)85%moderate
May Weather11°C (51°F)83 mm (3.3 inches)83%high
June Weather13°C (57°F)81 mm (3.2 inches)85%very high
July Weather15°C (60°F)85 mm (3.3 inches)86%very high
August Weather15°C (59°F)110 mm (4.3 inches)85%high
September Weather13°C (55°F)81 mm (3.2 inches)86%moderate
October Weather10°C (50°F)93 mm (3.7 inches)87%moderate
November Weather7°C (45°F)110 mm (4.3 inches)86%low
December Weather6°C (43°F)111 mm (4.4 inches)84%low

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