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September Weather in Harleston, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Harleston, United Kingdom hovers around 15°C (59°F). Expect a minimum chill of 3°C (38°F) and highs reaching up to 27°C (82°F). This month also brings about 59 mm (2.3 in) of precipitation over 11 days, resulting in a cozy average humidity of 84%. Enjoy the unique climate this season!

September Temperature in Harleston

In September in Harleston, the average temperature is 15°C (59°F). Maximums can reach 27°C (82°F), and minimums can be as low as 3°C (38°F). This climate makes Harleston a pleasant destination for travelers looking to enjoy mild weather during this time of year.

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

The chart illustrates September temperature patterns in Harleston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harleston, September typically has an average temperature of 15°C (59°F), with highs reaching up to 27°C (82°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec404245485461646459534643
Data source: Temperature data for Harleston 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 Harleston

In Harleston in September, the precipitation amount is 59 mm (2.3 in) over the course of 11 days.

September Precipitation Trends in Harleston

The chart displays monthly precipitation patterns in Harleston, 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 Harleston, September typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec485555316170717959794580
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Harleston

In Harleston in September, humidity is 84%. With an average temperature of 15°C (59°F), this humidity feels like an oppressive blanket wrapping around you, making it challenging to enjoy outdoor activities and travel comfortably.

September Average Humidity in Harleston

This chart illustrates the average monthly humidity levels in Harleston, 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 Harleston is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%87%86%85%83%83%80%78%84%88%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Harleston

In Harleston 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 Harleston.

Maximum UV Index Levels in Harleston for September

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

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

This table compares monthly weather conditions in Harleston, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)48 mm (1.9 inches)89%low
February Weather6°C (43°F)55 mm (2.2 inches)87%low
March Weather7°C (45°F)55 mm (2.2 inches)86%moderate
April Weather9°C (48°F)31 mm (1.2 inches)85%moderate
May Weather12°C (54°F)61 mm (2.4 inches)83%high
June Weather16°C (61°F)70 mm (2.7 inches)83%very high
July Weather18°C (64°F)71 mm (2.8 inches)79%very high
August Weather18°C (64°F)79 mm (3.1 inches)78%high
September Weather15°C (59°F)59 mm (2.3 inches)84%moderate
October Weather12°C (54°F)79 mm (3.1 inches)88%moderate
November Weather8°C (47°F)45 mm (1.8 inches)89%low
December Weather6°C (43°F)80 mm (3.1 inches)88%low

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