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September Weather in Grappenhall, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Grappenhall, United Kingdom is a pleasant 14°C (57°F). Expect temperatures to range from a chilly 3°C (37°F) to a warm 28°C (82°F). With 93 mm (3.7 in) of precipitation spread over 15 days, it's a good idea to keep that umbrella handy! The air tends to be quite moist, with an average humidity of 85%, adding to the distinctive charm of this season.

September Temperature in Grappenhall

In September in Grappenhall, the average temperature is 14°C (57°F). The maximum can reach 28°C (82°F), and the minimum can be as low as 3°C (37°F). Be prepared for a mix of warm and cool weather, making it an ideal time for outdoor adventures and layering up for comfort.

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

The chart illustrates September temperature patterns in Grappenhall, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grappenhall, September typically has an average temperature of 14°C (57°F), with highs reaching up to 28°C (82°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec414245485460626157524642
Data source: Temperature data for Grappenhall 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 Grappenhall

In Grappenhall in September, the precipitation amount is 93 mm (3.7 in) over the course of 15 days.

September Precipitation Trends in Grappenhall

The chart displays monthly precipitation patterns in Grappenhall, 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 Grappenhall, September typically receives around 93 mm (3.7 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec698188506994102108931067997
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Grappenhall

In Grappenhall in September, humidity is 85%. With an average temperature of 14°C (57°F), this humidity feels like a thick blanket enveloping you, making travel feel heavy and sluggish.

September Average Humidity in Grappenhall

This chart illustrates the average monthly humidity levels in Grappenhall, 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 Grappenhall is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%86%85%79%81%78%79%85%90%91%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Grappenhall

In Grappenhall 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 Grappenhall.

Maximum UV Index Levels in Grappenhall for September

The chart shows the monthly maximum UV Index (UVI) for Grappenhall 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 Grappenhall typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123578875421
Data source: Grappenhall 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 Grappenhall Compares to Other Months

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

This table compares monthly weather conditions in Grappenhall, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)69 mm (2.7 inches)89%low
February Weather6°C (43°F)81 mm (3.2 inches)88%low
March Weather7°C (45°F)88 mm (3.5 inches)86%moderate
April Weather9°C (48°F)50 mm (2.0 inches)84%moderate
May Weather12°C (54°F)69 mm (2.7 inches)79%high
June Weather15°C (60°F)94 mm (3.7 inches)81%very high
July Weather17°C (63°F)102 mm (4.0 inches)78%very high
August Weather16°C (61°F)108 mm (4.3 inches)79%high
September Weather14°C (57°F)93 mm (3.7 inches)85%moderate
October Weather11°C (52°F)106 mm (4.2 inches)90%moderate
November Weather8°C (46°F)79 mm (3.1 inches)91%low
December Weather6°C (43°F)97 mm (3.8 inches)89%low

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