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August Weather in St. Helens, United Kingdom

Last updated: August 27, 2025

In St. Helens, United Kingdom, the average temperature in August hovers around 18°C (64°F). You'll experience a comfortable range, with minimums dipping to 11°C (52°F) and maximums peaking at 26°C (80°F). Be prepared for some rain, as 78 mm (3.1 in) of precipitation can be expected over 12 days. With a cozy average humidity of 76%, it's the perfect time to embrace the season's charm!

August Temperature in St. Helens

In August in St. Helens, the average temperature is 18°C (64°F). Maximums can reach 26°C (80°F), and minimums can be as low as 11°C (52°F). This pleasant weather makes it an ideal time for travelers to explore and enjoy outdoor activities.

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

The chart illustrates August 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, August typically has an average temperature of 18°C (64°F), with highs reaching up to 26°C (80°F) and lows dropping to around 11°C (52°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.

August Precipitation in St. Helens

In St. Helens in August, the precipitation amount is 78 mm (3.1 in), occurring over a span of 12 days.

August Precipitation Trends in St. Helens

The chart displays monthly precipitation patterns in St. Helens, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In St. Helens, August typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec68757032567358785711787118
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in St. Helens

In St. Helens in August, humidity is 76%. With an average temperature of 18°C (64°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities feel steamy and invigorating—perfect for exploring charming streets, though you might want to take breaks in the shade.

August Average Humidity in St. Helens

This chart illustrates the average monthly humidity levels in St. Helens, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in St. Helens is approximately 76%, 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 August generated using information from the Copernicus Climate Change Service.

August UV Index in St. Helens

In St. Helens in August, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in St. Helens.

Maximum UV Index Levels in St. Helens for August

The chart shows the monthly maximum UV Index (UVI) for St. Helens in August, 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 August, the maximum UV index in St. Helens typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec224578876421
Data source: St. Helens August 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 August 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 August’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 August’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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