Denver
Colorado, USA
Long-term weather forecast
Long-term weather forecast
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September weather forecast and Climate
Denver, CO

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The colorful sky above the sunlit Denver city, Colorado in autumn, with a water body surrounded by trees, and majestic skyscrapers afar
The colorful sky above the sunlit Denver city, Colorado in autumn, with a water body surrounded by trees, and majestic skyscrapers afar
September is one of the best times to visit Denver and is the gateway to the pleasant autumn season. Average temperatures are in the range of 48°F (8.9°C) to 77°F (25°C) during the sunniest period of the year. The sunshine lasts for a daily 12 hours and reaches the ground during 74% of daylight hours.
The aspens turn colors by late September, and it is a great time to traverse the scenic interstate 70 to the Rockies amid drizzling rain.
The summer crowds dwindle by September as a new set of visitors arrive to experience the beautiful fall colors.
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  • The average high temperature in September: 78.5°F

The warmest month (with the highest average high temperature) is July (89.4°F).
The month with the lowest average high temperature is December (42.8°F).

  • The average low temperature in September: 48.3°F

The month with the highest average low temperature is July (58.9°F).
The coldest month (with the lowest average low temperature) is December (17.1°F).

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  • The average humidity in September: 50.1%

The month with the highest relative humidity is December (56.6%).
The month with the lowest relative humidity is July (47.8%).

  • The average rainfall in September: 1"

The wettest month (with the highest rainfall) is July (2.2").
Driest months (with the lowest rainfall) are January, February and December (0.4").

  • The average rainfall days in September: 6.5 days

The month with the highest number of rainy days is May (9.4 days).
Months with the lowest number of rainy days are January and December (4.1 days).

  • The average snowfall in September: 1.3"

The month with the highest snowfall is March (10.7").
Months with the lowest snowfall are June, July and August (0").

  • The average snowfall days in September: 0.5 days

The month with the highest number of snowfall days is March (5.8 days).
Months with the lowest number of snowfall days are June, July and August (0 days).

  • The average daylight in September: 12h

Months with the longest days are June and July (Average daylight: 15h).
The month with shortest days is December (Average daylight: 9h).

  • The average sunshine in September: 9.1h

Months with most sunshine are June and July (Average sunshine: 10.5h).
The month with least sunshine is December (Average sunshine: 6.3h).

  • The average UV index in September: 7

The month with the highest UV index is July (UV index 11).
Months with the lowest UV index are January and December (UV index 2).

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