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September Weather in Cambridge, United States

Last updated: June 24, 2025

In September, the average temperature in Cambridge, United States is a pleasant 20°C (68°F), with a minimum dipping to 3°C (38°F) and a maximum soaring to 34°C (93°F). Expect an average of 121 mm (4.8 in) of precipitation over 10 days, accompanied by a humidity level of 73%. Whether you're exploring or relaxing, be prepared for a mix of conditions!

September Temperature in Cambridge

In September in Cambridge, the average temperature is 20°C (68°F). Maximums can reach 34°C (93°F), and minimums can be as low as 3°C (38°F). Be prepared for a range of weather conditions during your travels!

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 20°C (68°F), with highs reaching up to 34°C (93°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec212238486274767368523730
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 precipitation amount is 121 mm (4.8 in) spread over a period of 10 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 121 mm (4.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec3642777915810278721211304136
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 73%. With an average temperature of 20°C (68°F), this humidity feels like a warm embrace, making outdoor activities somewhat sticky, yet the atmosphere remains pleasant for leisurely strolls and sightseeing.

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 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
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.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098643
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 (21°F)36 mm (1.4 inches)78%moderate
February Weather-6°C (22°F)42 mm (1.7 inches)80%moderate
March Weather3°C (39°F)77 mm (3.0 inches)77%high
April Weather9°C (49°F)79 mm (3.1 inches)77%very high
May Weather17°C (62°F)158 mm (6.2 inches)77%very high
June Weather23°C (74°F)102 mm (4.0 inches)81%extreme
July Weather25°C (77°F)78 mm (3.1 inches)81%very high
August Weather23°C (73°F)72 mm (2.8 inches)77%very high
September Weather20°C (68°F)121 mm (4.8 inches)73%very high
October Weather11°C (52°F)130 mm (5.1 inches)75%high
November Weather3°C (38°F)41 mm (1.6 inches)85%moderate
December Weather-1°C (30°F)36 mm (1.4 inches)83%moderate

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