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September Weather in Castle Douglas, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Castle Douglas, United Kingdom hovers around 13°C (55°F). Expect fluctuations as the minimum can drop to 1°C (34°F), while the maximum can reach a pleasant 25°C (78°F). Be prepared for some rain, as the area receives approximately 101 mm (4.0 in) of precipitation over 16 days. With an average humidity of 88%, it's best to pack for a damp yet delightful month!

September Temperature in Castle Douglas

In September in Castle Douglas, the average temperature is 13°C (55°F). The maximum can reach 25°C (78°F), and the minimum can be as low as 1°C (34°F). This makes it an ideal time for travelers who enjoy mild weather and a mix of both warm and cooler days.

September Weather in Castle Douglas: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Castle Douglas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castle Douglas, September typically has an average temperature of 13°C (55°F), with highs reaching up to 25°C (78°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec404143465157605955504541
Data source: Temperature data for Castle Douglas 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 Castle Douglas

In Castle Douglas in September, the total precipitation amount is 101 mm (4.0 in) spread over 16 days.

September Precipitation Trends in Castle Douglas

The chart displays monthly precipitation patterns in Castle Douglas, 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 Castle Douglas, September typically receives around 101 mm (4.0 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec841551075070104102137101149130126
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Castle Douglas

In Castle Douglas in September humidity is 88%. With an average temperature of 13°C (55°F), this humidity feels like a damp chill that clings to your skin, making it essential to dress in layers while exploring, as the moisture in the air can lead to a rather uncomfortable experience for traveling.

September Average Humidity in Castle Douglas

This chart illustrates the average monthly humidity levels in Castle Douglas, 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 Castle Douglas is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%86%85%81%83%82%82%88%90%92%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Castle Douglas

In Castle Douglas 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 Castle Douglas.

Maximum UV Index Levels in Castle Douglas for September

The chart shows the monthly maximum UV Index (UVI) for Castle Douglas 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 Castle Douglas typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123568865311
Data source: Castle Douglas 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 Castle Douglas Compares to Other Months

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

This table compares monthly weather conditions in Castle Douglas, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)84 mm (3.3 inches)90%low
February Weather5°C (41°F)155 mm (6.1 inches)88%low
March Weather6°C (43°F)107 mm (4.2 inches)86%moderate
April Weather8°C (46°F)50 mm (1.9 inches)85%moderate
May Weather11°C (52°F)70 mm (2.8 inches)80%high
June Weather14°C (57°F)104 mm (4.1 inches)83%very high
July Weather15°C (60°F)102 mm (4.0 inches)82%very high
August Weather15°C (59°F)137 mm (5.4 inches)82%high
September Weather13°C (55°F)101 mm (4.0 inches)88%moderate
October Weather10°C (50°F)148 mm (5.8 inches)90%moderate
November Weather7°C (45°F)130 mm (5.1 inches)92%low
December Weather5°C (42°F)126 mm (5.0 inches)89%low

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