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Monthly
Precipitation
Temperature
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Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Castle Rock, CO
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September
Average Temperature
High
25°
Feels 24
Low
10°
Feels 9
Average Precipitation
7 Days
Rain amount
22.7mm
Snow amount
1cm
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Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
19°
25
22°
26
25°
27
26°
28
23°
29
16°
30
21°
Forecast
Thursday, September 24, 2026
Day
19°
Feels 19
Wind
15 km/h N
Gust
23 km/h
Humidity
49%
P.O.P
40%
Rain
~1 mm
Night
10°
Feels 9
Wind
14 km/h S
Gust
21 km/h
Humidity
90%
P.O.P
20%
Historical Averages
Sep 24
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.