❮
Today Hourly 7 days 30 days September
❯

September 2026 Weather | Castle Rock, Colorado

Today 9/1
Sunny with a Chance of Thunderstorms
Day 82°
Night 55°
55
Wed 9/2
Cloudy Weather
Day 86°
Night 55°
25
Thu 9/3
Cloudy Weather
Day 88°
Night 55°
4
Fri 9/4
Partly Sunny with Showers
Day 84°
Night 57°
60
Sat 9/5
Cloudy Weather
Day 84°
Night 57°
55
Sun 9/6
Cloudy Weather
Day 86°
Night 61°
55
Mon 9/7
Sunny with a Chance of Thunderstorms
Day 84°
Night 61°
63
Tue 9/8
Sunny with a Chance of Thunderstorms
Day 86°
Night 57°
64
Wed 9/9
Rainy Weather
Day 82°
Night 57°
75
Thu 9/10
Sunny with a Chance of Thunderstorms
Day 77°
Night 55°
67
Fri 9/11
Sunny Weather
Day 79°
Night 54°
2
Sat 9/12
Sunny Weather
Day 81°
Night 54°
0
Sun 9/13
Cloudy Weather
Day 81°
Night 54°
1
Mon 9/14
Cloudy Weather
Day 77°
Night 46°
10
Tue 9/15
Sunny Weather
Day 81°
Night 52°
5
Wed 9/16
Sunny Weather
Day 81°
Night 52°
Thu 9/17
Cloudy Weather
Day 82°
Night 52°
60
Fri 9/18
Cloudy Weather
Day 81°
Night 52°
1
Sat 9/19
Sunny Weather
Day 81°
Night 52°
Sun 9/20
Sunny Weather
Day 81°
Night 50°
49
Mon 9/21
Sunny Weather
Day 79°
Night 50°
40
Tue 9/22
Sunny Weather
Day 81°
Night 48°
80
Wed 9/23
Sunny Weather
Day 79°
Night 50°
75
Thu 9/24
Sunny Weather
Day 79°
Night 48°
1
Fri 9/25
Cloudy Weather
Day 79°
Night 48°
1
Sat 9/26
Cloudy Weather
Day 79°
Night 48°
1
Sun 9/27
Cloudy Weather
Day 77°
Night 48°
2
Mon 9/28
Cloudy Weather
Day 77°
Night 48°
Tue 9/29
Cloudy Weather
Day 75°
Night 46°
Wed 9/30
Cloudy Weather
Day 75°
Night 46°

Explore U.S. Weather Trends

❄️ Coldest Cities in the U.S. – Live Temperature Rankings 🔥 Hottest Cities Today – Real-Time Heat Observations ⚠️ Active Weather Alerts – Warnings, Watches & Advisories 🌪️ Windiest Cities – Highest Sustained Wind Speeds 🌫️ Worst Air Quality – Cities with the Highest AQI 🍃 Best Air Quality – Cities with the Lowest AQI