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September Weather in Colchester, United States

Last updated: June 24, 2025

In September, the average temperature in Colchester, United States is a pleasant 21°C (70°F). However, be prepared for fluctuations, as temperatures can drop as low as 6°C (42°F) and soar up to 34°C (94°F). During this month, expect around 92 mm (3.6 in) of precipitation spread across approximately 8 days, with an average humidity of 78%.

September Temperature in Colchester

In September in Colchester, the average temperature is 21°C (70°F). The maximum can reach 34°C (94°F), while the minimum can be as low as 6°C (42°F). This pleasant temperature range makes Colchester an ideal destination for travelers looking to enjoy a comfortable climate.

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 21°C (70°F), with highs reaching up to 34°C (94°F) and lows dropping to around 6°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec272942516475777470554034
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 92 mm (3.6 in), occurring over the course of 8 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 92 mm (3.6 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec58651161051691369593921125347
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 21°C (70°F), this humidity feels like a warm, enveloping blanket that can leave travelers feeling sticky and slightly fatigued, making it important to stay hydrated and take frequent breaks from outdoor activities.

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.
JanFebMarAprMayJunJulAugSepOctNovDec81%81%81%82%78%81%79%77%78%79%87%84%
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 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 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357810111098642
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-3°C (27°F)58 mm (2.3 inches)81%moderate
February Weather-2°C (29°F)65 mm (2.5 inches)81%moderate
March Weather6°C (42°F)116 mm (4.6 inches)81%high
April Weather11°C (51°F)105 mm (4.1 inches)82%very high
May Weather18°C (64°F)169 mm (6.6 inches)78%very high
June Weather24°C (75°F)136 mm (5.3 inches)81%extreme
July Weather25°C (78°F)95 mm (3.7 inches)79%very high
August Weather24°C (75°F)93 mm (3.7 inches)77%very high
September Weather21°C (70°F)92 mm (3.6 inches)78%very high
October Weather13°C (56°F)112 mm (4.4 inches)78%high
November Weather5°C (41°F)53 mm (2.1 inches)87%moderate
December Weather1°C (35°F)47 mm (1.9 inches)84%low

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