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September Weather in Lowell, United States

Last updated: June 24, 2025

In Lowell, United States during September, the average temperature hovers around 24°C (75°F). Expect minimums to dip to 8°C (47°F) and maximums to soar up to 36°C (96°F). This month brings about 115 mm (4.5 in) of precipitation over approximately 8 days, and you'll find the average humidity sitting at a comfortable 75%.

September Temperature in Lowell

In September in Lowell, the average temperature is 24°C (75°F). The maximum can reach 36°C (96°F), while the minimum can drop to as low as 8°C (47°F). Pack accordingly for a mix of warm days and cooler nights during your travels.

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 24°C (75°F), with highs reaching up to 36°C (96°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec444954627177817975655147
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 115 mm (4.5 in) over the course of 8 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 115 mm (4.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec88112821011036788851159188118
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 75%. With average temperature 24°C (75°F), this humidity feels like a thick blanket wrapping around you, making outdoor activities feel especially stifling and leaving you yearning for cool breezes and refreshingly cold drinks.

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 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%84%82%83%82%80%74%75%79%87%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.
JanFebMarAprMayJunJulAugSepOctNovDec46810101111109853
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 Weather6°C (44°F)88 mm (3.5 inches)86%moderate
February Weather10°C (49°F)112 mm (4.4 inches)85%high
March Weather12°C (54°F)81 mm (3.2 inches)84%very high
April Weather17°C (63°F)101 mm (4.0 inches)82%very high
May Weather22°C (72°F)103 mm (4.1 inches)83%very high
June Weather25°C (78°F)67 mm (2.6 inches)82%extreme
July Weather27°C (82°F)88 mm (3.5 inches)80%extreme
August Weather26°C (79°F)85 mm (3.3 inches)74%very high
September Weather24°C (75°F)115 mm (4.5 inches)75%very high
October Weather18°C (65°F)91 mm (3.6 inches)79%very high
November Weather11°C (51°F)88 mm (3.5 inches)87%moderate
December Weather8°C (47°F)118 mm (4.7 inches)87%moderate

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