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September Weather in Bootle, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Bootle, United Kingdom hovers around 15°C (59°F), with cozy minimums of 7°C (45°F) and comfortable maximums reaching up to 24°C (76°F). Expect some rainfall, as precipitation averages 135 mm (5.3 in) spread over 17 days, contributing to a rather humid atmosphere with an average humidity level of 85%. Stay prepared for this delightful mix of warmth and moisture!

September Temperature in Bootle

In September in Bootle, the average temperature is 15°C (59°F). The maximum can reach 24°C (76°F) and the minimum can drop to as low as 7°C (45°F). It's a great time to explore Bootle, as the mild weather is perfect for outdoor activities and sightseeing.

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

The chart illustrates September temperature patterns in Bootle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bootle, September typically has an average temperature of 15°C (59°F), with highs reaching up to 24°C (76°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec434345485359626258534844
Data source: Temperature data for Bootle 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 Bootle

In Bootle in September, the precipitation amount is 135 mm (5.3 in) spread over 17 days.

September Precipitation Trends in Bootle

The chart displays monthly precipitation patterns in Bootle, 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 Bootle, September typically receives around 135 mm (5.3 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec931021055364107107132135140124142
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Bootle

In Bootle 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 Bootle

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

In Bootle 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 Bootle.

Maximum UV Index Levels in Bootle for September

The chart shows the monthly maximum UV Index (UVI) for Bootle 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 Bootle typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123578875321
Data source: Bootle 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 Bootle Compares to Other Months

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

This table compares monthly weather conditions in Bootle, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)93 mm (3.7 inches)89%low
February Weather6°C (43°F)102 mm (4.0 inches)88%low
March Weather7°C (45°F)105 mm (4.2 inches)86%moderate
April Weather9°C (48°F)53 mm (2.1 inches)84%moderate
May Weather12°C (54°F)64 mm (2.5 inches)79%high
June Weather15°C (59°F)107 mm (4.2 inches)81%very high
July Weather17°C (62°F)107 mm (4.2 inches)78%very high
August Weather16°C (62°F)132 mm (5.2 inches)79%high
September Weather15°C (59°F)135 mm (5.3 inches)85%moderate
October Weather12°C (54°F)140 mm (5.5 inches)90%moderate
November Weather9°C (48°F)124 mm (4.9 inches)91%low
December Weather7°C (45°F)142 mm (5.6 inches)89%low

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