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September Weather in South Mimms, United Kingdom

Last updated: August 27, 2025

In South Mimms, United Kingdom during the month of September, the average temperature hovers around 15°C (59°F). Expect the temperature to range from a cool 3°C (38°F) to a warm 28°C (83°F). Be prepared for some rainy days, with an average precipitation amount of 49 mm (1.9 in) spread over 10 days. Additionally, the average humidity is around 82%, contributing to a refreshing atmosphere.

September Temperature in South Mimms

In September in South Mimms, the average temperature is 15°C (59°F). The maximum can reach 28°C (83°F), while the minimum can drop as low as 3°C (38°F). Overall, this means travelers can expect mild weather perfect for exploring the outdoors.

September Weather in South Mimms: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in South Mimms, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Mimms, September typically has an average temperature of 15°C (59°F), with highs reaching up to 28°C (83°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec404345495561656459534643
Data source: Temperature data for South Mimms 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 South Mimms

In South Mimms in September, the total precipitation amount is 49 mm (1.9 in) over the course of 10 days.

September Precipitation Trends in South Mimms

The chart displays monthly precipitation patterns in South Mimms, 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 South Mimms, September typically receives around 49 mm (1.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec545156326574677249865183
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in South Mimms

In South Mimms 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 South Mimms

This chart illustrates the average monthly humidity levels in South Mimms, 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 South Mimms is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%86%85%79%81%71%76%82%91%92%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in South Mimms

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

Maximum UV Index Levels in South Mimms for September

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

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

This table compares monthly weather conditions in South Mimms, 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)91%low
February Weather6°C (43°F)51 mm (2.0 inches)89%low
March Weather7°C (45°F)56 mm (2.2 inches)86%moderate
April Weather9°C (49°F)32 mm (1.3 inches)85%moderate
May Weather13°C (55°F)65 mm (2.5 inches)79%high
June Weather16°C (62°F)74 mm (2.9 inches)80%very high
July Weather18°C (65°F)67 mm (2.6 inches)71%very high
August Weather18°C (64°F)72 mm (2.8 inches)76%high
September Weather15°C (59°F)49 mm (1.9 inches)82%high
October Weather12°C (53°F)86 mm (3.4 inches)90%moderate
November Weather8°C (46°F)51 mm (2.0 inches)92%low
December Weather6°C (43°F)83 mm (3.3 inches)92%low

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