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Denver's Monthly Weather Summary for September 2026

Current conditions at

Granby-Grand County Airport (KGNB)

Lat: 40.09°NLon: 105.92°WElev: 8207ft.

Fair

41°F

5°C

Humidity	60%
Wind Speed	Calm
Barometer	30.47 in
Dewpoint	28°F (-2°C)
Visibility	10.00 mi
Last update	7 Oct 5:35 am MDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

2 Miles SW Arapahoe Peak CO

Today
High: 51 °F
Mostly Sunny
then Chance
Rain/Snow
Tonight
Low: 35 °F
Slight Chance
Showers then
Partly Cloudy
Thursday
High: 49 °F
Sunny then
Slight Chance
Showers
Thursday Night
Low: 34 °F
Mostly Clear
Friday
High: 48 °F
Sunny then
Mostly Sunny
and Breezy
Friday Night
Low: 35 °F
Mostly Clear
and Breezy
Saturday
High: 45 °F
Mostly Sunny
and Breezy
Saturday Night
Low: 34 °F
Partly Cloudy
Sunday
High: 43 °F
Partly Sunny
then Chance
Rain/Snow

Detailed Forecast

Today

A chance of rain showers after noon, mixing with snow after 3pm. Increasing clouds, with a high near 51. East wind 6 to 8 mph becoming south in the afternoon. Chance of precipitation is 30%. Little or no snow accumulation expected.

Tonight

A 20 percent chance of showers before 9pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 35. South southwest wind around 8 mph becoming west northwest after midnight.

Thursday

A 20 percent chance of showers after 3pm. Sunny, with a high near 49. West northwest wind 7 to 9 mph, with gusts as high as 15 mph.

Thursday Night

Mostly clear, with a low around 34. West wind 6 to 9 mph.

Friday

Sunny, with a high near 48. Breezy, with a west wind 9 to 15 mph, with gusts as high as 24 mph.

Friday Night

Mostly clear, with a low around 35. Breezy.

Saturday

Mostly sunny, with a high near 45. Breezy.

Saturday Night

Partly cloudy, with a low around 34.