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September Weather in Thornhill, United Kingdom

Last updated: August 27, 2025

In Thornhill, United Kingdom, the average temperature in September hovers around 12°C (54°F). Expect a temperature range where lows can dip to 0°C (33°F) and highs can reach up to 25°C (78°F). During this month, anticipate about 101 mm (4.0 in) of precipitation spread across 16 days, contributing to an average humidity of 88%.

September Temperature in Thornhill

In September in Thornhill, the average temperature is 12°C (54°F), with maximums reaching up to 25°C (78°F) and minimums dipping as low as 0°C (33°F). This mild weather makes Thornhill an ideal destination for outdoor activities and exploring the local sights during this time of year.

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

The chart illustrates September temperature patterns in Thornhill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Thornhill, September typically has an average temperature of 12°C (54°F), with highs reaching up to 25°C (78°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec383941445056585753484339
Data source: Temperature data for Thornhill 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 Thornhill

In Thornhill in September, the total precipitation amount is 101 mm (4.0 in) spread over 16 days.

September Precipitation Trends in Thornhill

The chart displays monthly precipitation patterns in Thornhill, 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 Thornhill, September typically receives around 101 mm (4.0 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec861611164875112103144101142121122
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Thornhill

In Thornhill in September, humidity is 88%. With an average temperature of 12°C (54°F), this humidity feels like a thick, damp blanket, making traveling a bit uncomfortable as the air clings to your skin, causing you to sweat even in cooler weather.

September Average Humidity in Thornhill

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

In Thornhill 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 Thornhill.

Maximum UV Index Levels in Thornhill for September

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

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

This table compares monthly weather conditions in Thornhill, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)86 mm (3.4 inches)90%low
February Weather4°C (39°F)161 mm (6.3 inches)88%low
March Weather5°C (41°F)116 mm (4.6 inches)86%moderate
April Weather7°C (45°F)47 mm (1.9 inches)85%moderate
May Weather10°C (50°F)75 mm (2.9 inches)80%high
June Weather13°C (56°F)112 mm (4.4 inches)83%very high
July Weather15°C (59°F)103 mm (4.0 inches)82%very high
August Weather14°C (57°F)144 mm (5.7 inches)82%high
September Weather12°C (54°F)101 mm (4.0 inches)88%moderate
October Weather9°C (48°F)142 mm (5.6 inches)90%moderate
November Weather6°C (43°F)121 mm (4.8 inches)92%low
December Weather4°C (40°F)122 mm (4.8 inches)89%low

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