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September Weather in Costessey, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Costessey, United Kingdom is a comfortable 15°C (59°F), with minimums dipping to 5°C (42°F) and highs reaching 26°C (79°F). Visitors can expect 66 mm (2.6 in) of precipitation spread over 11 days, making it essential to be prepared for occasional showers. Additionally, the average humidity is a high 84%, contributing to a pleasantly mild atmosphere.

September Temperature in Costessey

In September in Costessey, the average temperature is 15°C (59°F). The maximum can reach 26°C (79°F), and the minimum can be as low as 5°C (42°F). This makes it a great time to explore Costessey while enjoying mild and comfortable weather.

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

The chart illustrates September temperature patterns in Costessey, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Costessey, September typically has an average temperature of 15°C (59°F), with highs reaching up to 26°C (79°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec414345485360636459544743
Data source: Temperature data for Costessey 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 Costessey

In Costessey in September, the precipitation amount is 66 mm (2.6 in) spread over 11 days.

September Precipitation Trends in Costessey

The chart displays monthly precipitation patterns in Costessey, 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 Costessey, September typically receives around 66 mm (2.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec486056325775698466855385
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Costessey

In Costessey in September, humidity is 84%. With an average temperature of 15°C (59°F), this humidity feels like an oppressive blanket wrapping around you, making it challenging to enjoy outdoor activities and travel comfortably.

September Average Humidity in Costessey

This chart illustrates the average monthly humidity levels in Costessey, 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 Costessey is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%87%86%85%83%83%80%78%84%88%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Costessey

In Costessey 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 Costessey.

Maximum UV Index Levels in Costessey for September

The chart shows the monthly maximum UV Index (UVI) for Costessey 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 Costessey typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875321
Data source: Costessey 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 Costessey Compares to Other Months

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

This table compares monthly weather conditions in Costessey, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)48 mm (1.9 inches)89%low
February Weather6°C (43°F)60 mm (2.4 inches)87%low
March Weather7°C (45°F)56 mm (2.2 inches)86%moderate
April Weather9°C (48°F)32 mm (1.2 inches)85%moderate
May Weather12°C (54°F)57 mm (2.2 inches)83%high
June Weather15°C (60°F)75 mm (2.9 inches)83%very high
July Weather17°C (63°F)69 mm (2.7 inches)79%very high
August Weather18°C (64°F)84 mm (3.3 inches)78%high
September Weather15°C (59°F)66 mm (2.6 inches)84%moderate
October Weather12°C (54°F)85 mm (3.3 inches)88%moderate
November Weather8°C (47°F)53 mm (2.1 inches)89%low
December Weather6°C (43°F)85 mm (3.3 inches)88%low

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