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September Weather in Colchester, United States

Last updated: June 24, 2025

In September, the average temperature in Colchester, United States hovers around 17°C (63°F), with a minimum of 2°C (36°F) and a maximum that can reach up to 33°C (91°F). Expect about 65 mm (2.6 in) of precipitation spread across 9 days, and don't forget to account for the average humidity level, which sits at a comfortable 78%. Enjoy the unique climate of this vibrant location!

September Temperature in Colchester

In September in Colchester, the average temperature is 17°C (63°F), with maximums reaching up to 33°C (91°F) and minimums dropping as low as 2°C (36°F). This varied climate makes it a great time for travelers to experience a mix of warm and cool weather, perfect for outdoor activities and exploration.

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

The chart illustrates September temperature patterns in Colchester, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Colchester, September typically has an average temperature of 17°C (63°F), with highs reaching up to 33°C (91°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec212431445766727063513728
Data source: Temperature data for Colchester 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 Colchester

In Colchester in September, the precipitation amount is 65 mm (2.6 in) over the course of 9 days.

September Precipitation Trends in Colchester

The chart displays monthly precipitation patterns in Colchester, 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 Colchester, September typically receives around 65 mm (2.6 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec767470101819096826514210473
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Colchester

In Colchester in September, humidity is 78%. With an average temperature of 17°C (63°F), this humidity feels like a warm, enveloping blanket, making traveling slightly uncomfortable as you navigate the sticky air, prompting the need for frequent breaks in cooler, shaded areas.

September Average Humidity in Colchester

This chart illustrates the average monthly humidity levels in Colchester, 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 Colchester is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%86%85%80%74%76%75%78%86%89%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Colchester

In Colchester 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 Colchester.

Maximum UV Index Levels in Colchester for September

The chart shows the monthly maximum UV Index (UVI) for Colchester 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 Colchester typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: Colchester 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 Colchester Compares to Other Months

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

This table compares monthly weather conditions in Colchester, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)76 mm (3.0 inches)93%low
February Weather-5°C (24°F)74 mm (2.9 inches)92%moderate
March Weather-1°C (31°F)69 mm (2.7 inches)86%moderate
April Weather7°C (44°F)101 mm (4.0 inches)85%very high
May Weather14°C (57°F)81 mm (3.2 inches)80%very high
June Weather19°C (66°F)90 mm (3.5 inches)74%very high
July Weather22°C (72°F)96 mm (3.8 inches)76%very high
August Weather21°C (70°F)82 mm (3.2 inches)75%very high
September Weather17°C (63°F)65 mm (2.6 inches)78%high
October Weather11°C (52°F)142 mm (5.6 inches)86%moderate
November Weather3°C (37°F)104 mm (4.1 inches)88%moderate
December Weather-2°C (28°F)73 mm (2.9 inches)89%low

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