Average September Temperatures for Colorado

Average temperatures for September at cities, towns and parks throughout Colorado are listed below in degrees Fahrenheit and Celsius.

You can jump to a separate table for Western Colorado and Eastern Colorado.

The tables give the normals for maximum and minimum temperatures based on weather data collected from 1991 to 2020 by the US National Centers for Environmental Information.

Western Colorado

Average September temperatures
High °F	Low °F	Place	High °C	Low °C
75	37	Alamosa	24	3
67	40	Aspen	19	4
58	32	Climax	15	0
80	54	Colorado National Monument	27	12
80	48	Cortez	27	9
66	31	Crested Butte	19	0
76	47	Dinosaur National Monument	25	8
76	45	Durango	24	7
78	44	Glenwood Springs	26	7
82	53	Grand Junction	28	11
70	34	Gunnison	21	1
62	32	Leadville	16	0
76	50	Mesa Verde National Park	24	10
69	45	Ouray	21	7
66	30	Silverton	19	-1
74	36	Steamboat Springs	23	2
64	34	Taylor Park Reservoir	18	1
68	34	Telluride	20	1
67	34	Vail	19	1

Front Range & Eastern Colorado

Average daily temperatures in September
High °F	Low °F	Place	High °C	Low °C
79	48	Boulder	26	9
81	50	Burlington	27	10
80	48	Canon City	27	9
77	49	Colorado Springs	25	9
80	48	Denver	27	9
70	39	Estes Park	21	4
71	33	Florissant Fossil Beds Monument	21	1
77	48	Fort Collins	25	9
72	44	Great Sand Dunes National Monument	22	6
82	49	Greeley	28	9
76	49	Lakewood	25	9
83	50	Pueblo	28	10
81	49	Sterling	27	9
80	52	Trinidad	26	11

Average Temperatures for Colorado in September

Western Colorado

Front Range & Eastern Colorado

Reference

More Colorado Weather Information