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September Weather in Rothesay, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Rothesay, United Kingdom is a mild 13°C (56°F). Expect a minimum of 3°C (38°F) and a maximum of 23°C (74°F), making it a season where layers are essential. However, be prepared for frequent rain, with 125 mm (4.9 in) of precipitation spread over 17 days. The air remains quite humid, averaging at 88%, so pack an umbrella and enjoy the cozy atmosphere!

September Temperature in Rothesay

In September in Rothesay, the average temperature is 13°C (56°F). Maximums can reach 23°C (74°F) and minimums can be as low as 3°C (38°F). Be prepared for a mix of mild and cool weather, making it ideal for layering during your travels.

September Weather in Rothesay: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Rothesay, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rothesay, September typically has an average temperature of 13°C (56°F), with highs reaching up to 23°C (74°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec434243465156585855514644
Data source: Temperature data for Rothesay 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 Rothesay

In Rothesay in September, the precipitation amount is 125 mm (4.9 in) spread over 17 days.

September Precipitation Trends in Rothesay

The chart displays monthly precipitation patterns in Rothesay, 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 Rothesay, September typically receives around 125 mm (4.9 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec1201681254871117114150125196158171
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Rothesay

In Rothesay in September, humidity is 88%. With an average temperature of 13°C (56°F), this humidity feels like a thick, warm blanket wrapping around you, making outdoor adventures sticky and challenging.

September Average Humidity in Rothesay

This chart illustrates the average monthly humidity levels in Rothesay, 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 Rothesay is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%86%85%82%84%86%86%88%89%90%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Rothesay

In Rothesay 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 Rothesay.

Maximum UV Index Levels in Rothesay for September

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

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

This table compares monthly weather conditions in Rothesay, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)120 mm (4.7 inches)87%low
February Weather6°C (43°F)168 mm (6.6 inches)86%low
March Weather6°C (44°F)125 mm (4.9 inches)86%moderate
April Weather8°C (46°F)48 mm (1.9 inches)85%moderate
May Weather10°C (51°F)71 mm (2.8 inches)82%high
June Weather13°C (56°F)117 mm (4.6 inches)84%very high
July Weather15°C (59°F)114 mm (4.5 inches)86%very high
August Weather15°C (58°F)150 mm (5.9 inches)86%high
September Weather13°C (56°F)125 mm (4.9 inches)88%moderate
October Weather11°C (51°F)196 mm (7.7 inches)89%moderate
November Weather8°C (47°F)158 mm (6.2 inches)90%low
December Weather6°C (44°F)171 mm (6.7 inches)86%low

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