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September Weather in Northumberland, United States

Last updated: June 24, 2025

In September, the average temperature in Northumberland, United States is a pleasant 18°C (64°F). Expect a minimum of 1°C (33°F) and a maximum reaching up to 33°C (92°F). During this time, you'll likely see about 76 mm (3.0 in) of precipitation spread across 8 days, with an average humidity of 72%. Stay prepared for a mix of weather!

September Temperature in Northumberland

In September in Northumberland, the average temperature is 18°C (64°F). The maximum can reach 33°C (92°F), and the minimum can be as low as 1°C (33°F). Be prepared for a wide range of weather conditions when traveling to Northumberland during this time.

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

The chart illustrates September temperature patterns in Northumberland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Northumberland, September typically has an average temperature of 18°C (64°F), with highs reaching up to 33°C (92°F) and lows dropping to around 1°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec252734465967737164533830
Data source: Temperature data for Northumberland 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 Northumberland

In Northumberland in September, the precipitation amount is 76 mm (3.0 in) spread over a duration of 8 days.

September Precipitation Trends in Northumberland

The chart displays monthly precipitation patterns in Northumberland, 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 Northumberland, September typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec7891721198583114847614110495
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Northumberland

In Northumberland in September, humidity is 72%. With an average temperature of 18°C (64°F), this humidity feels like a warm, sticky embrace, making travel somewhat uncomfortable as the air clings to your skin, leaving you longing for a refreshing breeze.

September Average Humidity in Northumberland

This chart illustrates the average monthly humidity levels in Northumberland, 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 Northumberland is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%86%84%76%72%67%64%72%81%87%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Northumberland

In Northumberland in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Northumberland.

Maximum UV Index Levels in Northumberland for September

The chart shows the monthly maximum UV Index (UVI) for Northumberland 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 Northumberland typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468910997532
Data source: Northumberland 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 Northumberland Compares to Other Months

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

This table compares monthly weather conditions in Northumberland, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)78 mm (3.1 inches)89%moderate
February Weather-3°C (27°F)91 mm (3.6 inches)88%moderate
March Weather1°C (34°F)72 mm (2.9 inches)86%high
April Weather8°C (47°F)119 mm (4.7 inches)84%very high
May Weather15°C (59°F)85 mm (3.3 inches)76%very high
June Weather20°C (68°F)83 mm (3.3 inches)72%very high
July Weather23°C (73°F)114 mm (4.5 inches)66%very high
August Weather22°C (71°F)84 mm (3.3 inches)64%very high
September Weather18°C (64°F)76 mm (3.0 inches)72%high
October Weather11°C (53°F)141 mm (5.6 inches)81%moderate
November Weather3°C (38°F)104 mm (4.1 inches)87%moderate
December Weather-1°C (30°F)94 mm (3.7 inches)84%low

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