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September Weather in Lowell, United States

Last updated: June 24, 2025

In Lowell, United States, the average temperature in September hovers around 23°C (73°F). Expect a minimum of 7°C (45°F) and a maximum that can soar up to 34°C (93°F). During this month, you'll encounter approximately 70 mm (2.8 in) of precipitation spread over 6 days. With an average humidity of 64%, be prepared for a mix of warmth and moisture!

September Temperature in Lowell

In September in Lowell, the average temperature is 23°C (73°F). The maximum can reach 34°C (93°F) and the minimum can be as low as 7°C (45°F). This range makes it an ideal time for travelers to enjoy outdoor activities while also being prepared for cooler evenings.

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

The chart illustrates September temperature patterns in Lowell, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lowell, September typically has an average temperature of 23°C (73°F), with highs reaching up to 34°C (93°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec374051576776797773604843
Data source: Temperature data for Lowell 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 Lowell

In Lowell in September, the precipitation amount is 70 mm (2.8 in) over the course of 6 days.

September Precipitation Trends in Lowell

The chart displays monthly precipitation patterns in Lowell, 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 Lowell, September typically receives around 70 mm (2.8 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec84961451771759496151701606869
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lowell

In Lowell in September, humidity is 64%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace, making travel quite comfortable yet slightly sticky, urging travelers to enjoy leisurely activities early in the day or seek shade during peak hours.

September Average Humidity in Lowell

This chart illustrates the average monthly humidity levels in Lowell, 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 Lowell is approximately 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%78%76%78%83%83%78%68%64%70%83%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lowell

In Lowell in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Lowell.

Maximum UV Index Levels in Lowell for September

The chart shows the monthly maximum UV Index (UVI) for Lowell 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 Lowell typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
Data source: Lowell 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 Lowell Compares to Other Months

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

This table compares monthly weather conditions in Lowell, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)84 mm (3.3 inches)81%moderate
February Weather5°C (40°F)96 mm (3.8 inches)78%high
March Weather11°C (52°F)145 mm (5.7 inches)76%high
April Weather14°C (57°F)177 mm (7.0 inches)78%very high
May Weather19°C (67°F)175 mm (6.9 inches)83%very high
June Weather24°C (76°F)94 mm (3.7 inches)83%extreme
July Weather26°C (79°F)96 mm (3.8 inches)78%extreme
August Weather25°C (77°F)151 mm (5.9 inches)68%very high
September Weather23°C (73°F)70 mm (2.8 inches)64%very high
October Weather15°C (60°F)160 mm (6.3 inches)70%high
November Weather9°C (48°F)68 mm (2.7 inches)83%moderate
December Weather6°C (43°F)69 mm (2.7 inches)87%moderate

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