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September Weather in Harley, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Harley, United Kingdom is a pleasant 14°C (57°F). Expect a minimum of 2°C (35°F) and a comfortable maximum of 28°C (83°F). During this period, you can anticipate about 60 mm (2.3 in) of precipitation spread over 10 days, with humidity levels hovering around 85%. Enjoy the refreshing climate!

September Temperature in Harley

In September in Harley, the average temperature is 14°C (57°F). Maximum temperatures can reach 28°C (83°F), while minimums can drop as low as 2°C (35°F). Be prepared for a wide range of weather conditions to make the most of your trip!

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

The chart illustrates September temperature patterns in Harley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harley, September typically has an average temperature of 14°C (57°F), with highs reaching up to 28°C (83°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec404244475359636157524543
Data source: Temperature data for Harley 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 Harley

In Harley in September, the precipitation amount is 60 mm (2.3 in) over a span of 10 days.

September Precipitation Trends in Harley

The chart displays monthly precipitation patterns in Harley, 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 Harley, September typically receives around 60 mm (2.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec546573507184687560917386
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Harley

In Harley in September, humidity is 85%. With an average temperature of 14°C (57°F), this humidity feels like a thick blanket enveloping you, making travel feel heavy and sluggish.

September Average Humidity in Harley

This chart illustrates the average monthly humidity levels in Harley, 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 Harley is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%86%85%79%81%78%79%85%90%91%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Harley

In Harley in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Harley, you can refer to this Hourly UV Index in Harley.

Maximum UV Index Levels in Harley for September

The chart shows the monthly maximum UV Index (UVI) for Harley 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 Harley typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578876421
Data source: Harley 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 Harley Compares to Other Months

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

This table compares monthly weather conditions in Harley, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)54 mm (2.1 inches)89%low
February Weather6°C (42°F)65 mm (2.5 inches)88%low
March Weather7°C (44°F)73 mm (2.9 inches)86%moderate
April Weather9°C (48°F)50 mm (2.0 inches)84%moderate
May Weather12°C (53°F)71 mm (2.8 inches)79%high
June Weather15°C (59°F)84 mm (3.3 inches)81%very high
July Weather17°C (63°F)68 mm (2.7 inches)78%very high
August Weather16°C (61°F)75 mm (3.0 inches)79%high
September Weather14°C (57°F)60 mm (2.3 inches)85%high
October Weather11°C (52°F)91 mm (3.6 inches)90%moderate
November Weather7°C (46°F)73 mm (2.9 inches)91%low
December Weather6°C (43°F)85 mm (3.4 inches)89%low

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