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September Weather in Navan, Ireland

Last updated: August 23, 2025

In September, the average temperature in Navan, Ireland hovers around 13°C (56°F). The weather can vary significantly, with minimums dropping to 2°C (36°F) and maximums peaking at 24°C (75°F). Expect about 73 mm (2.9 in) of precipitation over 12 days, and prepare for a generally moist atmosphere with an average humidity of 86%.

September Temperature in Navan

In September in Navan, the average temperature is 13°C (56°F). The maximum can reach 24°C (75°F), and the minimum can be as low as 2°C (36°F). This range makes it a perfect time to explore Navan, so pack accordingly for both warmer days and cooler evenings!

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

The chart illustrates September temperature patterns in Navan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Navan, September typically has an average temperature of 13°C (56°F), with highs reaching up to 24°C (75°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec424344475358615956514643
Data source: Temperature data for Navan 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 Navan

In Navan in September, the precipitation amount is 73 mm (2.9 in) occurring over a span of 12 days.

September Precipitation Trends in Navan

The chart displays monthly precipitation patterns in Navan, 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 Navan, September typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec5285794768777310773778287
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Navan

In Navan in September, humidity is 86%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket enveloping you, making outdoor activities slightly uncomfortable and prompting travelers to seek shade or air-conditioned spaces frequently.

September Average Humidity in Navan

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

In Navan 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 Navan.

Maximum UV Index Levels in Navan for September

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

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

This table compares monthly weather conditions in Navan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)52 mm (2.0 inches)85%low
February Weather6°C (43°F)85 mm (3.3 inches)86%low
March Weather7°C (44°F)79 mm (3.1 inches)86%moderate
April Weather9°C (48°F)47 mm (1.8 inches)85%moderate
May Weather12°C (53°F)68 mm (2.7 inches)83%high
June Weather14°C (58°F)77 mm (3.0 inches)85%very high
July Weather16°C (61°F)73 mm (2.9 inches)86%very high
August Weather15°C (60°F)107 mm (4.2 inches)85%high
September Weather13°C (56°F)73 mm (2.9 inches)86%moderate
October Weather10°C (51°F)77 mm (3.0 inches)87%moderate
November Weather8°C (46°F)82 mm (3.2 inches)86%low
December Weather6°C (43°F)87 mm (3.4 inches)84%low

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