Denver
Colorado, USA
Long term weather forecast
Long term weather forecast

September weather forecast and Climate
Denver, CO

  • Average high temperature in September: 78.5°F

Warmest month (with highest average high temperature) is July (89.4°F).
Month with lowest average high temperature is December (42.8°F).

  • Average low temperature in September: 48.3°F

Month with highest average low temperature is July (58.9°F).
Coldest month (with lowest average low temperature) is December (17.1°F).

  • Average humidity in September: 50.1%

Month with highest relative humidity is December (56.6%).
Month with lowest relative humidity is July (47.8%).

  • Average rainfall in September: 1"

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

  • Average rainfall days in September: 6.5 days

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

  • Average snowfall in September: 1.3"

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

  • Average snowfall days in September: 0.5 days

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

  • Average daylight in September: 12h

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

  • Average sunshine in September: 9.1h

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

  • Average UV index in September: 7

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

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