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September Weather in Cambridge, United States

Last updated: June 24, 2025

In Cambridge, United States, the average temperature for September hovers around 20°C (69°F). You can expect temperatures to range from a cool 5°C (42°F) to a warm 35°C (95°F). With an average humidity of 73% and 112 mm (4.4 in) of precipitation spread across 9 days, it's a month that balances warmth with refreshing showers.

September Temperature in Cambridge

In September in Cambridge, the average temperature is 20°C (69°F), with maximums reaching up to 35°C (95°F) and minimums dropping as low as 5°C (42°F). This makes it a great time for travelers to enjoy a mix of warm days and cooler evenings, perfect for exploring the area comfortably.

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 (69°F), with highs reaching up to 35°C (95°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec323543526371757368584337
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 112 mm (4.4 in), occurring over a span of 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 112 mm (4.4 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec9111911413414216612110011311098110
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 (69°F), this humidity feels like a warm embrace, making travel slightly sticky but ultimately comfortable as long as you stay hydrated and take breaks in the shade.

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.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%88%87%82%84%82%73%74%81%89%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098643
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 Weather0°C (32°F)91 mm (3.6 inches)88%moderate
February Weather2°C (36°F)119 mm (4.7 inches)88%moderate
March Weather6°C (43°F)114 mm (4.5 inches)88%high
April Weather11°C (53°F)134 mm (5.3 inches)86%very high
May Weather17°C (64°F)142 mm (5.6 inches)82%very high
June Weather22°C (71°F)166 mm (6.5 inches)84%very high
July Weather24°C (76°F)121 mm (4.8 inches)82%very high
August Weather23°C (74°F)100 mm (4.0 inches)73%very high
September Weather20°C (69°F)112 mm (4.4 inches)73%very high
October Weather14°C (58°F)110 mm (4.3 inches)81%high
November Weather6°C (43°F)98 mm (3.9 inches)89%moderate
December Weather3°C (37°F)110 mm (4.3 inches)86%moderate

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