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September Weather in St Mary's Bay, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in St Mary's Bay, United Kingdom is a pleasant 16°C (61°F). Expect a minimum of 7°C (46°F) and a maximum of 25°C (78°F), making it a comfortable time to visit. Rainfall is moderate, with an average precipitation amount of 53 mm (2.1 in) spread over about 10 days. Be prepared for high humidity at 80%, which adds to the overall atmosphere of the region.

September Temperature in St Mary's Bay

In September in St Mary's Bay, the average temperature is 16°C (61°F). The maximum can reach 25°C (78°F), while the minimum can drop to as low as 7°C (46°F). This mild and pleasant weather makes it a great time for traveling and exploring the local sights.

September Weather in St Mary's Bay: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in St Mary's Bay, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In St Mary's Bay, September typically has an average temperature of 16°C (61°F), with highs reaching up to 25°C (78°F) and lows dropping to around 7°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec434446495460646461564946
Data source: Temperature data for St Mary's Bay 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 Mary's Bay

In St Mary's Bay in September, the precipitation amount is 53 mm (2.1 in) spread over a duration of 10 days.

September Precipitation Trends in St Mary's Bay

The chart displays monthly precipitation patterns in St Mary's Bay, 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 Mary's Bay, September typically receives around 53 mm (2.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec68695929615648645310383119
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in St Mary's Bay

In St Mary's Bay in September, humidity is 80%. With an average temperature of 16°C (61°F), this humidity feels like a warm blanket wrapped around you, making sightseeing a sweat-inducing challenge but also lending a lush vibrancy to the surroundings that can enhance your travel experience.

September Average Humidity in St Mary's Bay

This chart illustrates the average monthly humidity levels in St Mary's Bay, 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 Mary's Bay is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%86%85%82%81%76%73%80%89%92%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in St Mary's Bay

In St Mary's Bay 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 St Mary's Bay.

Maximum UV Index Levels in St Mary's Bay for September

The chart shows the monthly maximum UV Index (UVI) for St Mary's Bay 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 Mary's Bay typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: St Mary's Bay 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 Mary's Bay Compares to Other Months

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

This table compares monthly weather conditions in St Mary's Bay, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)68 mm (2.7 inches)91%low
February Weather7°C (44°F)69 mm (2.7 inches)89%low
March Weather8°C (46°F)59 mm (2.3 inches)86%moderate
April Weather10°C (49°F)29 mm (1.1 inches)85%moderate
May Weather12°C (55°F)61 mm (2.4 inches)82%high
June Weather16°C (61°F)56 mm (2.2 inches)81%very high
July Weather18°C (65°F)48 mm (1.9 inches)76%very high
August Weather18°C (65°F)64 mm (2.5 inches)73%high
September Weather16°C (61°F)53 mm (2.1 inches)80%moderate
October Weather13°C (56°F)103 mm (4.0 inches)89%moderate
November Weather10°C (49°F)83 mm (3.3 inches)92%low
December Weather8°C (46°F)119 mm (4.7 inches)92%low

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