nomadseason

September Weather in Colby, United States

Last updated: June 24, 2025

In September, the average temperature in Colby, United States hovers around 21°C (70°F). Expect a range between a chilly 2°C (37°F) and a sizzling 37°C (99°F). During this time, precipitation typically amounts to 56 mm (2.2 in), spread over approximately 6 days, while the average humidity remains high at 82%.

September Temperature in Colby

In September in Colby, the average temperature is 21°C (70°F). Maximums can reach 37°C (99°F), while minimums can drop as low as 2°C (37°F). It's advisable to pack layers to stay comfortable during your travels.

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

The chart illustrates September temperature patterns in Colby, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Colby, September typically has an average temperature of 21°C (70°F), with highs reaching up to 37°C (99°F) and lows dropping to around 2°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec313143516175787569524335
Data source: Temperature data for Colby generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Colby

In Colby in September, the precipitation amount is 56 mm (2.2 in) spread over 6 days.

September Precipitation Trends in Colby

The chart displays monthly precipitation patterns in Colby, 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 Colby, September typically receives around 56 mm (2.2 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec1815563711757605756521418
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Colby

In Colby in September, humidity is 82%. With an average temperature of 21°C (70°F), this humidity feels like a warm, sticky embrace that can quickly lead to discomfort for travelers, making outdoor activities less enjoyable and requiring frequent breaks for hydration.

September Average Humidity in Colby

This chart illustrates the average monthly humidity levels in Colby, 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 Colby is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%78%66%66%83%83%83%86%82%75%77%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Colby

In Colby in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Colby.

Maximum UV Index Levels in Colby for September

The chart shows the monthly maximum UV Index (UVI) for Colby 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 Colby typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4579101211109643
Data source: Colby 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 Colby Compares to Other Months

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

This table compares monthly weather conditions in Colby, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)18 mm (0.7 inches)74%moderate
February Weather-1°C (31°F)15 mm (0.6 inches)78%moderate
March Weather6°C (43°F)56 mm (2.2 inches)66%high
April Weather10°C (51°F)37 mm (1.5 inches)66%very high
May Weather16°C (61°F)117 mm (4.6 inches)83%very high
June Weather24°C (75°F)57 mm (2.2 inches)83%extreme
July Weather25°C (78°F)60 mm (2.3 inches)83%extreme
August Weather24°C (75°F)57 mm (2.2 inches)86%very high
September Weather21°C (70°F)56 mm (2.2 inches)82%very high
October Weather11°C (52°F)52 mm (2.0 inches)75%high
November Weather6°C (44°F)14 mm (0.6 inches)77%moderate
December Weather2°C (36°F)18 mm (0.7 inches)82%moderate

Compare Colby's Climate with Cities Worldwide