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Today Hourly 7 days 30 days September
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September 2025 Weather | Boulder, Colorado

Today 9/4
Cloudy Weather
Day 88°
Night 52°
4
Fri 9/5
Sunny with a Chance of Thunderstorms
Day 70°
Night 48°
55
Sat 9/6
Stormy Weather
Day 73°
Night 52°
65
Sun 9/7
Cloudy Weather
Day 75°
Night 57°
25
Mon 9/8
Cloudy Weather
Day 84°
Night 57°
1
Tue 9/9
Partly Sunny with Showers
Day 88°
Night 59°
60
Wed 9/10
Cloudy Weather
Day 90°
Night 61°
0
Thu 9/11
Cloudy Weather
Day 88°
Night 61°
2
Fri 9/12
Cloudy Weather
Day 84°
Night 57°
55
Sat 9/13
Cloudy Weather
Day 81°
Night 57°
1
Sun 9/14
Sunny with a Chance of Thunderstorms
Day 81°
Night 55°
61
Mon 9/15
Sunny with a Chance of Thunderstorms
Day 84°
Night 55°
80
Tue 9/16
Sunny with a Chance of Thunderstorms
Day 82°
Night 57°
55
Wed 9/17
Partly Sunny with Showers
Day 79°
Night 48°
56
Thu 9/18
Rainy Weather
Day 72°
Night 48°
62
Fri 9/19
Cloudy Weather
Day 70°
Night 45°
25
Sat 9/20
Cloudy Weather
Day 72°
Night 43°
25
Sun 9/21
Sunny Weather
Day 72°
Night 45°
20
Mon 9/22
Sunny Weather
Day 75°
Night 43°
20
Tue 9/23
Sunny Weather
Day 75°
Night 45°
20
Wed 9/24
Cloudy Weather
Day 75°
Night 45°
20
Thu 9/25
Cloudy Weather
Day 79°
Night 50°
10
Fri 9/26
Sunny Weather
Day 81°
Night 50°
5
Sat 9/27
Rainy Weather
Day 77°
Night 43°
73
Sun 9/28
Cloudy Weather
Day 64°
Night 41°
25
Mon 9/29
Sunny Weather
Day 66°
Night 45°
5
Tue 9/30
Cloudy Weather
Day 77°
Night 46°
20