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September Weather in Cambridge, United States

Last updated: June 24, 2025

In Cambridge, United States, the average temperature in September is a pleasant 18°C (65°F). However, temperatures can fluctuate greatly, with a minimum of 2°C (37°F) and a maximum reaching 33°C (92°F). Visitors can expect 109 mm (4.3 in) of precipitation spread over approximately 9 days, accompanied by an average humidity of 79%.

September Temperature in Cambridge

In September in Cambridge, the average temperature is 18°C (65°F). The maximum can reach 33°C (92°F), while the minimum can be as low as 2°C (37°F). This makes Cambridge an ideal destination for travelers seeking a mix of warm days and cooler evenings, perfect for exploring outdoor activities.

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 18°C (65°F), with highs reaching up to 33°C (92°F) and lows dropping to around 2°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec222336465970757265523730
Data source: Temperature data for Cambridge 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 Cambridge

In Cambridge in September, the total precipitation amount is 109 mm (4.3 in) spread over 9 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 109 mm (4.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec54525810112711692971091144348
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Cambridge

In Cambridge in September, humidity is 79%. With an average temperature of 18°C (65°F), this humidity feels like walking through a warm mist, making traveling slightly uncomfortable and sticky, but offering a refreshing escape when you find moments of shade or a breeze.

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 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
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 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 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34589101098532
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.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)54 mm (2.1 inches)85%moderate
February Weather-5°C (23°F)52 mm (2.0 inches)85%moderate
March Weather2°C (36°F)58 mm (2.3 inches)85%moderate
April Weather8°C (46°F)101 mm (4.0 inches)85%very high
May Weather15°C (60°F)127 mm (5.0 inches)78%very high
June Weather21°C (71°F)116 mm (4.6 inches)80%very high
July Weather24°C (75°F)92 mm (3.6 inches)78%very high
August Weather22°C (72°F)97 mm (3.8 inches)76%very high
September Weather18°C (65°F)109 mm (4.3 inches)79%very high
October Weather11°C (52°F)114 mm (4.5 inches)83%moderate
November Weather3°C (37°F)43 mm (1.7 inches)88%moderate
December Weather-1°C (30°F)47 mm (1.9 inches)81%low

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