September Weather in Harlington, United Kingdom

Last updated: August 27, 2025

In Harlington, United Kingdom, the average temperature for September hovers around 15°C (59°F), with a minimum dip to 3°C (37°F) and a maximum rise to 29°C (84°F). Expect about 51 mm (2.0 in) of precipitation spread over 9 days, contributing to an average humidity of 82%—ideal for those who enjoy a gentle, moisture-rich climate!

September Temperature in Harlington

In September, in Harlington, the average temperature is 15°C (59°F). The maximum can reach 29°C (84°F), while the minimum can drop as low as 3°C (37°F). It's a great time for travelers to enjoy mild weather and a variety of outdoor activities.

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

The chart illustrates September temperature patterns in Harlington, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harlington, September typically has an average temperature of 15°C (59°F), with highs reaching up to 29°C (84°F) and lows dropping to around 3°C (37°F).

Data source: Temperature data for Harlington generated using information from the Copernicus Climate Change Service.

September Precipitation in Harlington

In Harlington in September, the total precipitation amount is 51 mm (2.0 in) spread over 9 days.

September Precipitation Trends in Harlington

The chart displays monthly precipitation patterns in Harlington, 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 Harlington, September typically receives around 51 mm (2.0 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Harlington

In Harlington in September, humidity is 82%. With an average temperature of 15°C (59°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel sticky and uncomfortable for travelers.

September Average Humidity in Harlington

This chart illustrates the average monthly humidity levels in Harlington, 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 Harlington is approximately 82%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Harlington

In Harlington 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 Harlington, you can refer to this Hourly UV Index in Harlington.

Maximum UV Index Levels in Harlington for September

The chart shows the monthly maximum UV Index (UVI) for Harlington 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 Harlington typically reaches 6, which falls under the high exposure category.

Data source: Harlington 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 Harlington Compares to Other Months

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

This table compares monthly weather conditions in Harlington, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	53 mm (2.1 inches)	91%	low
February Weather	6°C (43°F)	49 mm (1.9 inches)	89%	low
March Weather	7°C (45°F)	57 mm (2.2 inches)	86%	moderate
April Weather	9°C (49°F)	36 mm (1.4 inches)	85%	moderate
May Weather	13°C (55°F)	67 mm (2.6 inches)	79%	high
June Weather	16°C (61°F)	74 mm (2.9 inches)	80%	very high
July Weather	18°C (65°F)	67 mm (2.6 inches)	71%	very high
August Weather	17°C (64°F)	70 mm (2.8 inches)	76%	high
September Weather	15°C (59°F)	51 mm (2.0 inches)	82%	high
October Weather	11°C (53°F)	90 mm (3.6 inches)	90%	moderate
November Weather	8°C (46°F)	53 mm (2.1 inches)	92%	low
December Weather	6°C (43°F)	80 mm (3.2 inches)	92%	low