September Weather in Lowell, United States

Last updated: June 24, 2025

In Lowell, United States, the average temperature in September is a comfortable 17°C (62°F). Expect minima as low as 3°C (38°F) and maxima soaring up to 36°C (97°F). During this period, you'll encounter an average precipitation amount of 101 mm (4.0 in) spread over 7 days, with the air holding a 66% humidity level, making for a refreshing yet vibrant atmosphere.

September Temperature in Lowell

In September in Lowell, the average temperature is 17°C (62°F). Maximums can reach up to 36°C (97°F), while minimums can drop as low as 3°C (38°F). It's advisable to pack for varying weather conditions to ensure a comfortable travel experience.

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 17°C (62°F), with highs reaching up to 36°C (97°F) and lows dropping to around 3°C (38°F).

Data source: Temperature data for Lowell generated using information from the Copernicus Climate Change Service.

September Precipitation in Lowell

In Lowell in September, the precipitation amount is 101 mm (4.0 in) over a period of 7 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 101 mm (4.0 inches) of precipitation spread over approximately 7 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Lowell

In Lowell in September, humidity is 66%. With an average temperature of 17°C (62°F), this humidity feels like a mild embrace, making it comfortable for exploring, yet slightly sticky, urging travelers to stay hydrated while enjoying the sights.

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 66%, offering insight into how humid the weather typically is during this month.

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 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 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 8, which falls under the very high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (40°F)	189 mm (7.4 inches)	84%	low
February Weather	4°C (39°F)	241 mm (9.5 inches)	85%	moderate
March Weather	6°C (43°F)	169 mm (6.6 inches)	86%	high
April Weather	9°C (49°F)	175 mm (6.9 inches)	83%	high
May Weather	13°C (55°F)	85 mm (3.3 inches)	83%	very high
June Weather	16°C (62°F)	57 mm (2.2 inches)	83%	very high
July Weather	20°C (68°F)	3 mm (0.1 inches)	78%	very high
August Weather	20°C (69°F)	8 mm (0.3 inches)	67%	very high
September Weather	17°C (62°F)	101 mm (4.0 inches)	66%	very high
October Weather	11°C (51°F)	133 mm (5.2 inches)	77%	moderate
November Weather	7°C (45°F)	179 mm (7.1 inches)	87%	moderate
December Weather	4°C (40°F)	216 mm (8.5 inches)	87%	low