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September Weather in Colo, United States

Last updated: June 24, 2025

In September, the average temperature in Colo, United States hovers around 20°C (68°F). However, be prepared for fluctuating conditions, with lows dipping to 3°C (38°F) and highs soaring up to 33°C (92°F). Expect 115 mm (4.5 in) of precipitation spread over 10 days, with an average humidity level of 73%, contributing to a pleasantly moist atmosphere.

September Temperature in Colo

In September, in Colo, the average temperature is 20°C (68°F). Maximum temperatures can reach up to 33°C (92°F), while minimums can drop to as low as 3°C (38°F). This makes Colo an ideal destination for travelers seeking pleasant weather and a chance to experience both warm days and cool nights.

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

The chart illustrates September temperature patterns in Colo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Colo, September typically has an average temperature of 20°C (68°F), with highs reaching up to 33°C (92°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec212238486273767368523730
Data source: Temperature data for Colo 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 Colo

In Colo in September, the precipitation amount is 115 mm (4.5 in) over a span of 10 days.

September Precipitation Trends in Colo

The chart displays monthly precipitation patterns in Colo, 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 Colo, September typically receives around 115 mm (4.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec3844778315110575621151324336
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Colo

In Colo in September, humidity is 73%. With an average temperature of 20°C (68°F), this humidity feels like a warm embrace, making outdoor activities somewhat sticky, yet the atmosphere remains pleasant for leisurely strolls and sightseeing.

September Average Humidity in Colo

This chart illustrates the average monthly humidity levels in Colo, 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 Colo is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Colo

In Colo 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 Colo.

Maximum UV Index Levels in Colo for September

The chart shows the monthly maximum UV Index (UVI) for Colo 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 Colo typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098643
Data source: Colo 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 Colo Compares to Other Months

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

This table compares monthly weather conditions in Colo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)38 mm (1.5 inches)78%moderate
February Weather-6°C (22°F)44 mm (1.7 inches)80%moderate
March Weather3°C (38°F)77 mm (3.0 inches)77%high
April Weather9°C (48°F)83 mm (3.3 inches)77%very high
May Weather16°C (62°F)151 mm (5.9 inches)77%very high
June Weather23°C (74°F)105 mm (4.1 inches)81%extreme
July Weather24°C (76°F)74 mm (2.9 inches)81%very high
August Weather23°C (73°F)62 mm (2.4 inches)77%very high
September Weather20°C (68°F)115 mm (4.5 inches)73%very high
October Weather11°C (52°F)132 mm (5.2 inches)75%high
November Weather3°C (38°F)43 mm (1.7 inches)85%moderate
December Weather-1°C (30°F)35 mm (1.4 inches)83%moderate

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