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September Weather in Stamford, United States

Last updated: June 24, 2025

In Stamford, United States, the average temperature in September is a comfortable 16°C (62°F). However, be prepared for a temperature range that can dip as low as 0°C (32°F) and soar up to 31°C (87°F). During this month, you can expect about 96 mm (3.8 in) of precipitation spread over 9 days, resulting in an average humidity level of 72%.

September Temperature in Stamford

In September in Stamford, the average temperature is 16°C (62°F). Maximum temperatures can reach 31°C (87°F), while minimums can dip as low as 0°C (32°F). Be prepared for a wide range of weather conditions when traveling during this month.

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

The chart illustrates September temperature patterns in Stamford, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Stamford, September typically has an average temperature of 16°C (62°F), with highs reaching up to 31°C (87°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec242732445665706861513629
Data source: Temperature data for Stamford 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 Stamford

In Stamford in September, the total precipitation amount is 96 mm (3.8 in) spread over a period of 9 days.

September Precipitation Trends in Stamford

The chart displays monthly precipitation patterns in Stamford, 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 Stamford, September typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec75938811511599118110961379493
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Stamford

In Stamford in September, humidity is 72%. With an average temperature of 16°C (62°F), this humidity feels like a warm blanket wrapped around you, making it slightly uncomfortable for traveling as you might find yourself sweating more than usual, especially during outdoor activities.

September Average Humidity in Stamford

This chart illustrates the average monthly humidity levels in Stamford, 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 Stamford is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%86%84%76%72%67%64%72%81%87%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Stamford

In Stamford 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 Stamford.

Maximum UV Index Levels in Stamford for September

The chart shows the monthly maximum UV Index (UVI) for Stamford 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 Stamford typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Stamford 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 Stamford Compares to Other Months

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

This table compares monthly weather conditions in Stamford, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)75 mm (2.9 inches)89%moderate
February Weather-3°C (27°F)93 mm (3.7 inches)88%moderate
March Weather0°C (33°F)88 mm (3.4 inches)86%high
April Weather7°C (44°F)115 mm (4.5 inches)84%very high
May Weather13°C (56°F)115 mm (4.5 inches)76%very high
June Weather18°C (65°F)99 mm (3.9 inches)72%very high
July Weather21°C (70°F)118 mm (4.6 inches)66%very high
August Weather20°C (68°F)110 mm (4.3 inches)64%very high
September Weather16°C (62°F)96 mm (3.8 inches)72%very high
October Weather11°C (51°F)137 mm (5.4 inches)81%high
November Weather2°C (37°F)94 mm (3.7 inches)87%moderate
December Weather-2°C (29°F)93 mm (3.7 inches)84%low

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