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September Weather in Swarthmoor, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Swarthmoor, United Kingdom hovers around 13°C (56°F), offering a mild climate for visitors. Temperatures can vary, with a minimum of 5°C (42°F) and a comfortable maximum of 24°C (75°F). However, be prepared for some rain, as 155 mm (6.1 in) of precipitation is expected over 18 days. Don't forget your umbrella, as the average humidity is quite high at 88%!

September Temperature in Swarthmoor

In September in Swarthmoor, the average temperature is 13°C (56°F). The maximum can reach 24°C (75°F), while the minimum can be as low as 5°C (42°F). This mild climate makes Swarthmoor an ideal destination for travelers looking to enjoy comfortable weather while exploring the area.

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

The chart illustrates September temperature patterns in Swarthmoor, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Swarthmoor, September typically has an average temperature of 13°C (56°F), with highs reaching up to 24°C (75°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec404143465257605956514642
Data source: Temperature data for Swarthmoor 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 Swarthmoor

In Swarthmoor in September, the total precipitation amount is 155 mm (6.1 in) spread over 18 days.

September Precipitation Trends in Swarthmoor

The chart displays monthly precipitation patterns in Swarthmoor, 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 Swarthmoor, September typically receives around 155 mm (6.1 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec1101751495477119127180155212151175
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Swarthmoor

In Swarthmoor 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 Swarthmoor

This chart illustrates the average monthly humidity levels in Swarthmoor, 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 Swarthmoor 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 Swarthmoor

In Swarthmoor 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 Swarthmoor.

Maximum UV Index Levels in Swarthmoor for September

The chart shows the monthly maximum UV Index (UVI) for Swarthmoor 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 Swarthmoor typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875321
Data source: Swarthmoor 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 Swarthmoor Compares to Other Months

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

This table compares monthly weather conditions in Swarthmoor, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)110 mm (4.3 inches)90%low
February Weather5°C (41°F)175 mm (6.9 inches)88%low
March Weather6°C (43°F)149 mm (5.9 inches)86%moderate
April Weather8°C (46°F)54 mm (2.1 inches)85%moderate
May Weather11°C (52°F)77 mm (3.0 inches)80%high
June Weather14°C (58°F)119 mm (4.7 inches)83%very high
July Weather16°C (60°F)127 mm (5.0 inches)82%very high
August Weather15°C (60°F)180 mm (7.1 inches)82%high
September Weather13°C (56°F)155 mm (6.1 inches)88%moderate
October Weather11°C (51°F)212 mm (8.4 inches)90%moderate
November Weather8°C (46°F)151 mm (5.9 inches)92%low
December Weather6°C (42°F)175 mm (6.9 inches)89%low

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