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September Weather in Northampton, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Northampton, United Kingdom hovers around 14°C (58°F), with the mercury dipping to a chilly 3°C (37°F) at its lowest and soaring to a warm 29°C (84°F) at its peak. Expect 59 mm (2.3 in) of precipitation spread over 9 days, contributing to a notably high average humidity of 85%. Stay prepared for a mix of warm days and occasional rain!

September Temperature in Northampton

In September in Northampton, the average temperature is 14°C (58°F). Maximum temperatures can reach 29°C (84°F), while minimums can drop as low as 3°C (37°F). This mild climate makes Northampton an appealing destination for travelers looking to enjoy a range of outdoor activities.

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

The chart illustrates September temperature patterns in Northampton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Northampton, September typically has an average temperature of 14°C (58°F), with highs reaching up to 29°C (84°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec404244485460646358524542
Data source: Temperature data for Northampton 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 Northampton

In Northampton in September, the precipitation amount is 59 mm (2.3 in) over the course of 9 days.

September Precipitation Trends in Northampton

The chart displays monthly precipitation patterns in Northampton, 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 Northampton, September typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec535161406673707359876081
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Northampton

In Northampton in September, humidity is 85%. With an average temperature of 14°C (58°F), this humidity feels like a thick blanket wrapping around you, making even short walks feel heavy and exhausting for traveling.

September Average Humidity in Northampton

This chart illustrates the average monthly humidity levels in Northampton, 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 Northampton is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%86%84%80%81%76%77%85%90%92%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Northampton

In Northampton 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 Northampton.

Maximum UV Index Levels in Northampton for September

The chart shows the monthly maximum UV Index (UVI) for Northampton 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 Northampton typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: Northampton 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 Northampton Compares to Other Months

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

This table compares monthly weather conditions in Northampton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)53 mm (2.1 inches)90%low
February Weather6°C (42°F)51 mm (2.0 inches)88%low
March Weather7°C (45°F)61 mm (2.4 inches)86%moderate
April Weather9°C (48°F)40 mm (1.6 inches)84%moderate
May Weather12°C (54°F)66 mm (2.6 inches)80%high
June Weather16°C (61°F)73 mm (2.9 inches)81%very high
July Weather18°C (64°F)70 mm (2.8 inches)76%very high
August Weather17°C (63°F)73 mm (2.9 inches)77%high
September Weather14°C (58°F)59 mm (2.3 inches)85%moderate
October Weather11°C (52°F)87 mm (3.4 inches)90%moderate
November Weather7°C (46°F)60 mm (2.3 inches)92%low
December Weather6°C (43°F)81 mm (3.2 inches)90%low

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