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September Weather in Gretna, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Gretna, United Kingdom hovers around 13°C (55°F). You can expect temperatures to range from a cool 2°C (36°F) to a warm 27°C (82°F). This month typically brings about 85 mm (3.3 in) of precipitation over 14 days, accompanied by a high average humidity of 88%. Don't forget your umbrella!

September Temperature in Gretna

In September in Gretna, the average temperature is 13°C (55°F). Maximums can reach 27°C (82°F), while minimums can drop to as low as 2°C (36°F). This makes Gretna a versatile destination for travelers, offering pleasant days and cooler nights.

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

The chart illustrates September temperature patterns in Gretna, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Gretna, September typically has an average temperature of 13°C (55°F), with highs reaching up to 27°C (82°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec394143465257605955504441
Data source: Temperature data for Gretna 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 Gretna

In Gretna in September, the precipitation amount is 85 mm (3.3 in) over the course of 14 days.

September Precipitation Trends in Gretna

The chart displays monthly precipitation patterns in Gretna, 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 Gretna, September typically receives around 85 mm (3.3 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec731179840609587113851248797
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Gretna

In Gretna in September humidity is 88%. With an average temperature of 13°C (55°F), this humidity feels like a damp chill that clings to your skin, making it essential to dress in layers while exploring, as the moisture in the air can lead to a rather uncomfortable experience for traveling.

September Average Humidity in Gretna

This chart illustrates the average monthly humidity levels in Gretna, 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 Gretna is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%86%85%81%83%82%82%88%90%92%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Gretna

In Gretna 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 Gretna.

Maximum UV Index Levels in Gretna for September

The chart shows the monthly maximum UV Index (UVI) for Gretna 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 Gretna typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123568865321
Data source: Gretna 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 Gretna Compares to Other Months

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

This table compares monthly weather conditions in Gretna, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)73 mm (2.9 inches)90%low
February Weather5°C (41°F)117 mm (4.6 inches)88%low
March Weather6°C (43°F)98 mm (3.9 inches)86%moderate
April Weather8°C (46°F)40 mm (1.6 inches)85%moderate
May Weather11°C (52°F)60 mm (2.4 inches)80%high
June Weather14°C (58°F)95 mm (3.7 inches)83%very high
July Weather16°C (61°F)87 mm (3.4 inches)82%very high
August Weather15°C (59°F)113 mm (4.5 inches)82%high
September Weather13°C (55°F)85 mm (3.3 inches)88%moderate
October Weather10°C (50°F)124 mm (4.9 inches)90%moderate
November Weather7°C (45°F)87 mm (3.4 inches)92%low
December Weather5°C (41°F)97 mm (3.8 inches)89%low

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