September Weather in Cambridge, United States

Last updated: June 24, 2025

In September, the average temperature in Cambridge, United States hovers around 16°C (60°F), with temperatures ranging from a chilly 0°C (32°F) to a warm 32°C (90°F). During this month, you can expect 74 mm (2.9 in) of precipitation spread over 8 days, contributing to an average humidity level of 77%. Prepare accordingly for a mix of cool and warm days!

September Temperature in Cambridge

In September in Cambridge, the average temperature is 16°C (60°F). Maximums can reach 32°C (90°F) while minimums can be as low as 0°C (32°F). Be prepared for a wide range of temperatures, making it an ideal time for travelers to dress in layers and enjoy the diverse weather.

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

The chart illustrates September temperature patterns in Cambridge, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cambridge, September typically has an average temperature of 16°C (60°F), with highs reaching up to 32°C (90°F) and lows dropping to around 0°C (32°F).

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

September Precipitation in Cambridge

In Cambridge in September, the precipitation amount is 74 mm (2.9 in) over a period of 8 days.

September Precipitation Trends in Cambridge

The chart displays monthly precipitation patterns in Cambridge, 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 Cambridge, September typically receives around 74 mm (2.9 inches) of precipitation spread over approximately 8 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Cambridge

In Cambridge in September, humidity is 77%. With an average temperature of 16°C (60°F), this humidity feels like a moist blanket wrapping around you, making outdoor activities a bit uncomfortable and requiring frequent hydration as you soak in the vibrant local culture.

September Average Humidity in Cambridge

This chart illustrates the average monthly humidity levels in Cambridge, 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 Cambridge is approximately 77%, 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 Cambridge

In Cambridge 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 Cambridge.

Maximum UV Index Levels in Cambridge for September

The chart shows the monthly maximum UV Index (UVI) for Cambridge 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 Cambridge typically reaches 7, which falls under the high exposure category.

Data source: Cambridge 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 Cambridge Compares to Other Months

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

This table compares monthly weather conditions in Cambridge, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (19°F)	88 mm (3.5 inches)	88%	low
February Weather	-6°C (21°F)	83 mm (3.3 inches)	88%	moderate
March Weather	-2°C (29°F)	75 mm (2.9 inches)	85%	moderate
April Weather	5°C (42°F)	126 mm (5.0 inches)	81%	very high
May Weather	12°C (54°F)	95 mm (3.7 inches)	76%	very high
June Weather	17°C (64°F)	85 mm (3.4 inches)	74%	very high
July Weather	20°C (69°F)	103 mm (4.1 inches)	74%	very high
August Weather	20°C (68°F)	81 mm (3.2 inches)	74%	very high
September Weather	16°C (60°F)	74 mm (2.9 inches)	77%	high
October Weather	9°C (49°F)	129 mm (5.1 inches)	82%	moderate
November Weather	1°C (34°F)	115 mm (4.5 inches)	85%	moderate
December Weather	-5°C (24°F)	120 mm (4.7 inches)	84%	low