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September Weather in St Just, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in St Just, United Kingdom is a mild 16°C (61°F), with a minimum of 11°C (53°F) and a maximum of 20°C (69°F). During this time, you can expect approximately 73 mm (2.9 in) of precipitation spread over 13 days, contributing to an average humidity of 84%. Perfect for a cozy getaway or exploring the local sights!

September Temperature in St Just

In September in St Just, the average temperature is 16°C (61°F). The maximum can reach 20°C (69°F), while the minimum can be as low as 11°C (53°F). This mild climate makes it an ideal time for exploring outdoor attractions and enjoying leisurely walks.

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

The chart illustrates September temperature patterns in St Just, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In St Just, September typically has an average temperature of 16°C (61°F), with highs reaching up to 20°C (69°F) and lows dropping to around 11°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec494848505358626260575351
Data source: Temperature data for St Just 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 Just

In St Just in September, the precipitation amount is 73 mm (2.9 in) over the course of 13 days.

September Precipitation Trends in St Just

The chart displays monthly precipitation patterns in St Just, 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 Just, September typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec879990446469665873139125150
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in St Just

In St Just in September, humidity is 84%. With an average temperature of 16°C (61°F), this humidity feels like a blanket of warmth, making travel slightly sticky but overall comfortable, as long as you stay hydrated and take breaks in the shade.

September Average Humidity in St Just

This chart illustrates the average monthly humidity levels in St Just, 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 Just is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%84%82%83%85%85%85%85%84%84%82%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in St Just

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

Maximum UV Index Levels in St Just for September

The chart shows the monthly maximum UV Index (UVI) for St Just 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 Just typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec224679886421
Data source: St Just 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 Just Compares to Other Months

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

This table compares monthly weather conditions in St Just, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (49°F)87 mm (3.4 inches)81%low
February Weather9°C (49°F)99 mm (3.9 inches)83%low
March Weather9°C (49°F)90 mm (3.6 inches)82%moderate
April Weather10°C (50°F)44 mm (1.7 inches)83%high
May Weather12°C (54°F)64 mm (2.5 inches)85%high
June Weather14°C (58°F)69 mm (2.7 inches)85%very high
July Weather17°C (62°F)66 mm (2.6 inches)85%very high
August Weather16°C (62°F)58 mm (2.3 inches)85%very high
September Weather16°C (61°F)73 mm (2.9 inches)84%high
October Weather14°C (57°F)139 mm (5.5 inches)84%moderate
November Weather12°C (53°F)125 mm (4.9 inches)82%low
December Weather10°C (51°F)150 mm (5.9 inches)81%low

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