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September Weather in Swaffham, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Swaffham, United Kingdom is a pleasant 15°C (59°F). Expect minimums dropping to 4°C (40°F) and highs reaching up to 27°C (80°F). Be prepared for some rain, as 73 mm (2.9 in) of precipitation typically occurs over 11 days. With an average humidity of 84%, it’s a month that calls for light layers and a reliable umbrella!

September Temperature in Swaffham

In September in Swaffham, the average temperature is 15°C (59°F). Maximums can reach 27°C (80°F), and minimums can be as low as 4°C (40°F). Be sure to pack a variety of clothing to comfortably enjoy both warm and cooler moments during your travels.

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

The chart illustrates September temperature patterns in Swaffham, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Swaffham, September typically has an average temperature of 15°C (59°F), with highs reaching up to 27°C (80°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec414245485460646459534743
Data source: Temperature data for Swaffham 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 Swaffham

In Swaffham in September, the precipitation amount is 73 mm (2.9 in), spread over 11 days.

September Precipitation Trends in Swaffham

The chart displays monthly precipitation patterns in Swaffham, 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 Swaffham, September typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec506258336679708173885583
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Swaffham

In Swaffham 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 Swaffham

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

In Swaffham 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 Swaffham.

Maximum UV Index Levels in Swaffham for September

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

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

This table compares monthly weather conditions in Swaffham, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)50 mm (2.0 inches)89%low
February Weather6°C (43°F)62 mm (2.4 inches)87%low
March Weather7°C (45°F)58 mm (2.3 inches)86%moderate
April Weather9°C (48°F)33 mm (1.3 inches)85%moderate
May Weather12°C (54°F)66 mm (2.6 inches)83%high
June Weather16°C (60°F)79 mm (3.1 inches)83%very high
July Weather18°C (64°F)70 mm (2.8 inches)79%very high
August Weather18°C (64°F)81 mm (3.2 inches)78%high
September Weather15°C (59°F)73 mm (2.9 inches)84%moderate
October Weather12°C (54°F)88 mm (3.5 inches)88%moderate
November Weather8°C (47°F)55 mm (2.2 inches)89%low
December Weather6°C (43°F)83 mm (3.3 inches)88%low

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