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September Weather in St. Helens, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in St. Helens, United Kingdom is a pleasant 16°C (61°F), with a minimum of 8°C (47°F) and a maximum of 24°C (76°F). Expect about 57 mm (2.2 in) of precipitation spread over 10 days, contributing to an average humidity of 82%. This blend of moderate temperatures and moisture makes for an intriguing climate experience!

September Temperature in St. Helens

In September in St. Helens, the average temperature is 16°C (61°F). The maximum can reach 24°C (76°F), while the minimum can be as low as 8°C (47°F). This mild climate makes St. Helens a great destination for travelers seeking comfortable weather and pleasant outdoor activities.

September Weather in St. Helens: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in St. Helens, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In St. Helens, September typically has an average temperature of 16°C (61°F), with highs reaching up to 24°C (76°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec444546495561646461565047
Data source: Temperature data for St. Helens 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 St. Helens

In St. Helens in September, the precipitation amount is 57 mm (2.2 in) over a span of 10 days.

September Precipitation Trends in St. Helens

The chart displays monthly precipitation patterns in St. Helens, 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 St. Helens, September typically receives around 57 mm (2.2 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec68757032567358785711787118
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in St. Helens

In St. Helens in September humidity is 82%. With an average temperature of 16°C (61°F), this humidity feels like a heavy blanket enveloping you, making travel feel a bit sluggish and requiring frequent breaks to hydrate and cool down.

September Average Humidity in St. Helens

This chart illustrates the average monthly humidity levels in St. Helens, 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 St. Helens 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 St. Helens

In St. Helens 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 St. Helens, you can refer to this Hourly UV Index in St. Helens.

Maximum UV Index Levels in St. Helens for September

The chart shows the monthly maximum UV Index (UVI) for St. Helens 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 St. Helens typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec224578876421
Data source: St. Helens 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 St. Helens Compares to Other Months

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

This table compares monthly weather conditions in St. Helens, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (44°F)68 mm (2.7 inches)91%low
February Weather7°C (45°F)75 mm (3.0 inches)89%low
March Weather8°C (47°F)70 mm (2.7 inches)86%moderate
April Weather10°C (50°F)32 mm (1.3 inches)85%moderate
May Weather13°C (55°F)56 mm (2.2 inches)79%high
June Weather16°C (61°F)73 mm (2.9 inches)80%very high
July Weather18°C (65°F)58 mm (2.3 inches)71%very high
August Weather18°C (64°F)78 mm (3.1 inches)76%high
September Weather16°C (61°F)57 mm (2.2 inches)82%high
October Weather13°C (56°F)117 mm (4.6 inches)90%moderate
November Weather10°C (50°F)87 mm (3.4 inches)92%low
December Weather8°C (47°F)118 mm (4.7 inches)92%low

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