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September Weather in Northampton, United States

Last updated: June 24, 2025

In September, the average temperature in Northampton, United States hovers around 20°C (68°F), with a minimum of 3°C (38°F) and a maximum reaching up to 33°C (93°F). Expect about 111 mm (4.4 in) of precipitation spread over 10 days, contributing to a comfortable average humidity of 66%. Prepare for a mix of pleasant warmth and refreshing showers!

September Temperature in Northampton

In September in Northampton, the average temperature is 20°C (68°F). Maximum temperatures can reach 33°C (93°F), while the minimum can drop to as low as 3°C (38°F). This variation makes Northampton an ideal destination for travelers seeking diverse weather experiences.

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 20°C (68°F), with highs reaching up to 33°C (93°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec313440506170767367574236
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 111 mm (4.4 in) over a span of 10 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 111 mm (4.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec7510910011514110613614211112295110
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Northampton

In Northampton in September, humidity is 66%. With an average temperature of 20°C (68°F), this humidity feels like a warm embrace, making outdoor activities enjoyable but potentially a bit sticky, so travelers should stay hydrated and consider light, breathable clothing for comfort.

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 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%85%83%75%74%65%62%66%79%87%85%
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 is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
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 Weather0°C (32°F)75 mm (2.9 inches)87%moderate
February Weather1°C (34°F)109 mm (4.3 inches)85%moderate
March Weather4°C (40°F)99 mm (3.9 inches)85%high
April Weather10°C (51°F)115 mm (4.5 inches)83%very high
May Weather16°C (61°F)141 mm (5.5 inches)75%very high
June Weather21°C (70°F)106 mm (4.2 inches)73%very high
July Weather24°C (76°F)136 mm (5.3 inches)65%very high
August Weather23°C (74°F)142 mm (5.6 inches)62%very high
September Weather20°C (68°F)111 mm (4.4 inches)66%very high
October Weather14°C (57°F)122 mm (4.8 inches)79%high
November Weather6°C (43°F)95 mm (3.7 inches)87%moderate
December Weather2°C (36°F)110 mm (4.3 inches)85%low

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