Castle Rock, Colorado Weather
Pikas hayfeeding in granite peaks. Day 77 of spring. Read this microseason across nine climate regions →
Castle Rock weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——83°49°—
- FridayJun 5Overcast——84°60°+1°
- SaturdayJun 6Light Showers21%0.09″84°57°0°
- SundayJun 7Overcast21%—85°54°+1°
- MondayJun 8Partly Cloudy22%—87°53°+2°
- TuesdayJun 9Clear——92°56°+5°
- WednesdayJun 10Light Drizzle—0.01″93°61°+1°
Ozone at AQI 61. AQI flat over the last 6 hours (within ±3 points). Overcast through the UV peak window (cloud cover ~67%) — afternoon ozone should stay flat.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 61. Overcast through the UV peak window (cloud cover ~67%) — afternoon ozone should stay flat.
- Present
- AQI 61
- UV peak
- 8.5 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 35
PM × Wind × Precip
PM2.5/PM10 ratio 0.62 with 7 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.62
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- transport
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 5:28 AM
- Moonset
- 3:06 PM
- In sign
- ♒︎ Aquarius
Pikas hayfeeding in granite peaks
Castle Rock at a glance
- Today vs. normal: 78°F — typical for the season
- Last frost: April 12 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Warm-season window is open
As of June 4, the last spring frost has passed for most years. Transplant tomatoes, peppers, eggplants, basil, and cucurbits (cucumbers, squash, melons) now. Direct-sow beans and corn into warm soil.
SPC Convective Outlook
Storm Prediction Center — Castle Rock
SPC has placed Castle Rock in the General Thunderstorms category for severe thunderstorms today.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.