Today | Weather | Wednesday, June 10, 2026

Active Weather Warnings

Weather in Castle Rock, Colorado

12:18 AM

Now

63° F

Feels Like 61°

Precipitation 0 %

Wind 8 mph

Humidity 25 %

Today

Day 88°

Night 48°

Precipitation 2 %

Wind 13 mph

UV Index (0 - 11+) 11

Warning: Extreme UV Index Today: 11+

Overexposure to the sun's harmful UV rays can cause sunburn and increase the risk of developing skin cancer, including melanoma. Protect yourself by wearing clothing that covers your skin, sunglasses, and a hat. Apply a broad-spectrum sunscreen with an SPF of 30 or higher every two hours, even on cloudy days. Minimize direct sun exposure during peak hours (10 AM to 4 PM) to reduce the risk.

Castle Rock Weather Forecast Updated

Last updated on June 09, 2026 at 11:16 PM

Weather Forecast History

Last Year's Weather on This Day (June 10, 2025)

Day

88°

Night

55°

Air Quality in Castle Rock

NOW

34 AQI

Good air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 1.56 µg/m³

PM₁₀ 2.67 µg/m³

O₃ 0.037 ppm

NO₂ 0.7 ppb

SO₂ 0.1 ppb

CO 0.07 ppm

NH₃ 2.58 µg/m³

NO 0 µg/m³

PM_2.5 – Fine particles <2.5μm

PM₁₀ – Inhalable particles <10μm

O₃ – Ozone

NO₂ – Nitrogen dioxide

SO₂ – Sulfur dioxide

CO – Carbon monoxide

NH₃ – Ammonia

NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)

PM_2.5 – 1.56 µg/m³

PM₁₀ – 2.67 µg/m³

O₃ – 72.21 µg/m³

NO₂ – 1.36 µg/m³

SO₂ – 0.29 µg/m³

CO – 82.3 µg/m³

NH₃ – 2.58 µg/m³

NO – 0 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Castle Rock

Severe Future Possible

Fire Weather Watch

Fire Weather Watch issued June 9 at 12:34AM MDT until June 10 at 8:00PM MDT by NWS Denver CO

Jun 10, 12:00 PM → Jun 10, 8:00 PM

The National Weather Service in Denver has issued a Fire Weather
Watch for wind and low relative humidity, which is in effect from
Wednesday afternoon through Wednesday evening.

* AFFECTED AREA...Fire Weather Zones 240, 241, 242, 243, 244,
245, 246, 247, 248, 249, 250 and 251.

* TIMING...For the Red Flag Warning, from noon today to 9 PM MDT
this evening. For the Fire Weather Watch, from Wednesday
afternoon through Wednesday evening.

* WINDS...For today, southwest winds 20 to 25 mph with gusts up
to 40 mph. For Wednesday, west winds 15 to 25 mph with gusts up
to 40 mph.

* RELATIVE HUMIDITY...As low as 10 percent for Tuesday and
Wednesday.

IMPACTS: Conditions will be favorable for rapid fire spread in
areas that did not receive significant rainfall on Monday.
Avoid outdoor burning and any activity that may produce a spark
and start a wildfire.

+ Read More

A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings.

Updated: Jun 9, 12:25 PM Source: NWS Alert

Severe Expected Likely

Red Flag Warning

Red Flag Warning issued June 9 at 9:19PM MDT until June 10 at 8:00PM MDT by NWS Denver CO