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September Weather in Newcastle West, Ireland

Last updated: August 23, 2025

In September, the average temperature in Newcastle West, Ireland hovers around 13°C (56°F). You can expect a minimum of 0°C (33°F) and a maximum of 26°C (80°F) throughout the month. Be prepared for precipitation totaling 84 mm (3.3 in) over approximately 14 days, coupled with an average humidity level of a staggering 88%.

September Temperature in Newcastle West

In September in Newcastle West, the average temperature is 13°C (56°F). The maximum can reach 26°C (80°F), while the minimum can be as low as 0°C (33°F). It's advisable to pack layers and prepare for both warm days and cooler nights while traveling.

September Weather in Newcastle West: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Newcastle West, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Newcastle West, 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 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec434444485357605956514645
Data source: Temperature data for Newcastle West 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 Newcastle West

In Newcastle West in September, the precipitation amount is 84 mm (3.3 in) over the course of 14 days.

September Precipitation Trends in Newcastle West

The chart displays monthly precipitation patterns in Newcastle West, 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 Newcastle West, September typically receives around 84 mm (3.3 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec69113100607065741228410090118
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Newcastle West

In Newcastle West 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 Newcastle West

This chart illustrates the average monthly humidity levels in Newcastle West, 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 Newcastle West 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 Newcastle West

In Newcastle West 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 Newcastle West.

Maximum UV Index Levels in Newcastle West for September

The chart shows the monthly maximum UV Index (UVI) for Newcastle West 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 Newcastle West typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: Newcastle West 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 Newcastle West Compares to Other Months

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

This table compares monthly weather conditions in Newcastle West, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)69 mm (2.7 inches)88%low
February Weather7°C (44°F)113 mm (4.4 inches)88%low
March Weather7°C (44°F)100 mm (3.9 inches)87%moderate
April Weather9°C (48°F)60 mm (2.4 inches)86%moderate
May Weather11°C (53°F)70 mm (2.7 inches)83%high
June Weather14°C (57°F)65 mm (2.6 inches)83%very high
July Weather16°C (60°F)74 mm (2.9 inches)85%very high
August Weather15°C (59°F)122 mm (4.8 inches)85%high
September Weather13°C (56°F)84 mm (3.3 inches)88%moderate
October Weather10°C (51°F)100 mm (4.0 inches)91%moderate
November Weather8°C (46°F)90 mm (3.6 inches)92%low
December Weather7°C (45°F)118 mm (4.7 inches)89%low

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