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September Weather in Saint Dennis, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Saint Dennis, United Kingdom hovers around 15°C (59°F). However, you might experience temperatures ranging from a brisk 7°C (44°F) to a warm 27°C (81°F). Be prepared for some rain, as the area sees approximately 77 mm (3.0 in) of precipitation over 13 days. With an average humidity of 85%, you can expect the air to feel quite refreshing!

September Temperature in Saint Dennis

In September in Saint Dennis, the average temperature is 15°C (59°F). Maximums can reach 27°C (81°F), while minimums can drop to as low as 7°C (44°F). This mild climate is perfect for exploring outdoor activities and enjoying sightseeing adventures.

September Weather in Saint Dennis: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Saint Dennis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Dennis, September typically has an average temperature of 15°C (59°F), with highs reaching up to 27°C (81°F) and lows dropping to around 7°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec454647505459626159555048
Data source: Temperature data for Saint Dennis 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 Saint Dennis

In Saint Dennis in September, the precipitation amount is 77 mm (3.0 in) spread over a total of 13 days.

September Precipitation Trends in Saint Dennis

The chart displays monthly precipitation patterns in Saint Dennis, 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 Saint Dennis, September typically receives around 77 mm (3.0 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec748689486793727377119102131
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Saint Dennis

In Saint Dennis in September, humidity is 85%. With an average temperature of 15°C (59°F), this humidity feels like a warm, damp blanket wrapping around you, making traveling quite uncomfortable and sticky. Be prepared to take frequent breaks and stay hydrated as you navigate the lush, but humid environment.

September Average Humidity in Saint Dennis

This chart illustrates the average monthly humidity levels in Saint Dennis, 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 Saint Dennis is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%84%83%84%85%86%87%86%85%85%82%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Saint Dennis

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

Maximum UV Index Levels in Saint Dennis for September

The chart shows the monthly maximum UV Index (UVI) for Saint Dennis 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 Saint Dennis typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec224679876421
Data source: Saint Dennis 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 Saint Dennis Compares to Other Months

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

This table compares monthly weather conditions in Saint Dennis, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (46°F)74 mm (2.9 inches)81%low
February Weather8°C (46°F)86 mm (3.4 inches)84%low
March Weather8°C (47°F)89 mm (3.5 inches)83%moderate
April Weather10°C (50°F)48 mm (1.9 inches)84%high
May Weather12°C (54°F)67 mm (2.6 inches)85%high
June Weather15°C (59°F)93 mm (3.6 inches)86%very high
July Weather17°C (63°F)72 mm (2.8 inches)87%very high
August Weather16°C (62°F)73 mm (2.9 inches)86%high
September Weather15°C (59°F)77 mm (3.0 inches)85%high
October Weather13°C (55°F)118 mm (4.7 inches)85%moderate
November Weather10°C (50°F)102 mm (4.0 inches)82%low
December Weather9°C (48°F)131 mm (5.1 inches)80%low

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