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Fort Collins, CO

62°F
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Fort Collins, CO Weather
Today WinterCast Local {stormName} Tracker Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

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Today Hourly 10-Day Radar MinuteCast®

Monthly

Air Quality Health & Activities

September

January February March April May June July August September October November December

2026

2025 2026 2027

10-Day

S
M
T
W
T
F
S
30
Partly sunny
87°
55°
31
Partly sunny, a few showers
86°
50°
1
Variable clouds with showers
80°
54°
2
Mostly cloudy, showers around
79°
53°
3
A couple of afternoon showers
78°
52°
4
A couple of afternoon showers
79°
50°
5
Mostly cloudy, showers around
77°
49°
6
A couple of afternoon showers
77°
52°
7
Mostly sunny
82°
51°
8
Sunny to partly cloudy
83°
49°
9
Mostly sunny
78°
51°
10
Mostly cloudy, a few showers
76°
48°
11
Cloudy with showers around
75°
49°
12
Some sun with showers around
76°
49°
13
A couple of showers
74°
48°
14
A couple of afternoon showers
75°
51°
15
Sunshine and a few clouds
79°
52°
16
Plenty of sunshine
82°
54°
17
Plenty of sunshine
82°
50°
18
A shower in the afternoon
81°
43°
19
A couple of afternoon showers
72°
48°
20
Abundant sunshine
76°
49°
21
Plenty of sunshine
80°
52°
22
Sunny
79°
41°
23
A couple of afternoon showers
78°
40°
24
Shifting clouds and sun
69°
42°
25
Plenty of sun
70°
41°
26
Abundant sunshine
75°
43°
27
Hist. Avg.
74°
40°
28
Hist. Avg.
73°
40°
29
Hist. Avg.
73°
39°
30
Hist. Avg.
72°
39°
1
Hist. Avg.
72°
38°
2
Hist. Avg.
72°
38°
3
Hist. Avg.
71°
38°

Temperature Graph

°F
90° 78° 66° 54° 42° Sep
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 *27 *28 *29 *30
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable

September Weather in Fort Collins

Fort Collins's September 2026 forecast shows daily high temperatures ranging from 69° to 87°, with overnight lows between 40° and 55°. The average high for September is 78° with an average low of 49°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Fort Collins. See also: October | November | December.

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