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September Weather in Portadown, United Kingdom

Last updated: August 27, 2025

In Portadown, United Kingdom, the average temperature in September hovers around 13°C (56°F), but you can expect a range from a brisk 2°C (35°F) to a pleasantly warm 23°C (74°F). With an average precipitation of 68 mm (2.7 in) spread across 14 days, it's wise to pack your umbrella! The air is notably humid, with an average humidity level of 88%, making this a unique and intriguing time to explore.

September Temperature in Portadown

In September in Portadown, the average temperature is 13°C (56°F). Maximum temperatures can reach 23°C (74°F), while minimums can dip as low as 2°C (35°F). This mild climate makes it a great time to explore Portadown, so pack layers for comfort during your travels.

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

The chart illustrates September temperature patterns in Portadown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portadown, September typically has an average temperature of 13°C (56°F), with highs reaching up to 23°C (74°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec424244475358605956514643
Data source: Temperature data for Portadown 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 Portadown

In Portadown in September, the precipitation amount is 68 mm (2.7 in) distributed over a period of 14 days.

September Precipitation Trends in Portadown

The chart displays monthly precipitation patterns in Portadown, 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 Portadown, September typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec5787784666777611368798082
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Portadown

In Portadown 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 Portadown

This chart illustrates the average monthly humidity levels in Portadown, 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 Portadown is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%86%85%82%84%86%86%88%89%90%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Portadown

In Portadown 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 Portadown.

Maximum UV Index Levels in Portadown for September

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

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

This table compares monthly weather conditions in Portadown, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)57 mm (2.2 inches)87%low
February Weather6°C (43°F)87 mm (3.4 inches)86%low
March Weather7°C (44°F)78 mm (3.1 inches)86%moderate
April Weather8°C (48°F)46 mm (1.8 inches)85%moderate
May Weather11°C (53°F)66 mm (2.6 inches)82%high
June Weather14°C (58°F)77 mm (3.0 inches)84%very high
July Weather16°C (61°F)76 mm (3.0 inches)86%very high
August Weather15°C (60°F)113 mm (4.4 inches)86%high
September Weather13°C (56°F)68 mm (2.7 inches)88%moderate
October Weather10°C (51°F)79 mm (3.1 inches)89%moderate
November Weather8°C (46°F)79 mm (3.1 inches)90%low
December Weather6°C (43°F)82 mm (3.2 inches)86%low

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