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September Weather in Portesham, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Portesham, United Kingdom hovers around 15°C (59°F). Expect a minimum of 3°C (38°F) and a maximum of 27°C (81°F). This month typically brings about 48 mm (1.9 in) of precipitation over 9 days, with an average humidity level of 79%. Enjoy the diverse weather while exploring!

September Temperature in Portesham

In September in Portesham, the average temperature is 15°C (59°F), with a maximum that can reach 27°C (81°F) and a minimum as low as 3°C (38°F). This makes it an ideal time for travelers who enjoy mild weather and the opportunity to explore both warm and cooler conditions.

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

The chart illustrates September temperature patterns in Portesham, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portesham, September typically has an average temperature of 15°C (59°F), with highs reaching up to 27°C (81°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec424446495461646359544845
Data source: Temperature data for Portesham 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 Portesham

In Portesham in September, the total precipitation amount is 48 mm (1.9 in) spread over 9 days.

September Precipitation Trends in Portesham

The chart displays monthly precipitation patterns in Portesham, 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 Portesham, September typically receives around 48 mm (1.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec5164734873765378481066698
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Portesham

In Portesham in September humidity is 79%. With an average temperature of 15°C (59°F), this humidity feels like a muggy embrace that clings to your skin, making outdoor activities somewhat uncomfortable. Travelers may find themselves frequently seeking shelter or refreshing drinks to combat the warm, damp air, as the moisture in the atmosphere feels particularly heavy, especially during longer excursions.

September Average Humidity in Portesham

This chart illustrates the average monthly humidity levels in Portesham, 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 Portesham is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%86%84%80%80%70%73%79%89%90%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Portesham

In Portesham in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Portesham, you can refer to this Hourly UV Index in Portesham.

Maximum UV Index Levels in Portesham for September

The chart shows the monthly maximum UV Index (UVI) for Portesham 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 Portesham typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec224678876421
Data source: Portesham 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 Portesham Compares to Other Months

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

This table compares monthly weather conditions in Portesham, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)51 mm (2.0 inches)88%low
February Weather7°C (44°F)64 mm (2.5 inches)88%low
March Weather8°C (46°F)73 mm (2.9 inches)86%moderate
April Weather10°C (49°F)48 mm (1.9 inches)84%high
May Weather12°C (55°F)73 mm (2.9 inches)80%high
June Weather16°C (61°F)76 mm (3.0 inches)80%very high
July Weather18°C (64°F)53 mm (2.1 inches)70%very high
August Weather17°C (63°F)78 mm (3.1 inches)73%high
September Weather15°C (59°F)48 mm (1.9 inches)79%high
October Weather12°C (54°F)106 mm (4.2 inches)89%moderate
November Weather9°C (48°F)66 mm (2.6 inches)90%low
December Weather7°C (46°F)98 mm (3.9 inches)89%low

Compare Portesham's Climate with Cities Worldwide