Air quality index57Moderate

Acceptable for most people; unusually sensitive people should take it easier outdoors.

Next 24 hours

US AQI

68Now
58
47
4811 PM
48
49
522 AM
54
57
555 AM
53
51
508 AM
48
47
5211 AM
56
61
602 PM
60
59
565 PM
52
49

Air quality outlook

Worst hour each day

Today92Moderate
Fri 961Moderate
Sat 1049Good
Sun 11500Hazardous
Mon 1247Good

From our air-quality forecast models (GEOS-CF / GEFS aerosols). AQI uses the US EPA scale.

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About Castle Rock weather

Castle Rock is in Douglas County, Colorado, United States at 39.37°, -104.86°. Right now it’s 67° and clear; today’s high is 81° with a 1% chance of rain.

Colorado's climate is defined by dramatic elevation changes, from the eastern plains at around 3,500 feet to over 50 peaks exceeding 14,000 feet in the Rocky Mountains. Denver, known as the Mile High City, enjoys over 300 days of sunshine per year and has a semi-arid climate with low humidity. Temperature swings of 40 degrees or more in a single day are not uncommon along the Front Range.