Overcast
Castle Pines6,558 ft
The high south end of the metro, often the coolest of the thirteen.
The outlook
Rain chances increase this afternoon and will be highest Saturday with some locally heavy downpours possible. Temperatures will be warm today and Saturday, then cool down Sunday.
The days ahead
Rest of today
through midnight
Drizzle
Tomorrow
Sat
Rain · colder
Sun
Drizzle · colder
Rest of the week
Mon–Thu
Holding steady
2026 is running 5.2° warmer than the archive average so far.
The record high for September 18 is 89°, set in 2018.
This heating season is running 17% milder than normal so far.
Today loses 2 min 32 sec of daylight against yesterday.
Right now
Conditions
- Wind
- mph NW
- Humidity
- Pressure
Next 48 hours
Hourly forecast
Fri, Sep 18 → Sun, Sep 20Mountain · midnight starts a new day
7-day outlook
The week ahead
- Today79°58°
Drizzle · 37% precip
- Sat73°52°
Rain · 47% precip
- Sun70°49°
Drizzle · 47% precip
- Mon74°48°
Partly cloudy · 34% precip
- Tue79°51°
Drizzle · 23% precip
- Wed74°54°
Overcast · 21% precip
- Thu77°53°
Rain · 21% precip
Sun & Moon
Light of day
sunrise
6:43 AM
sunset
7:02 PM
Daylight
12 hr 19 min
−2 min 32 sec vs yesterday
Moon
First Quarter
Storm tracker
Live radar
Radar by RainViewer · 7-day precipitation forecast by Open-Meteo · basemap OpenFreeMap. Radar covers the past two hours plus a 30-minute nowcast; the 7-day layer is a precipitation forecast.
AdvancedAtmospheric detail & vertical profile
Atmospheric readings
Instability
70 J/kg
Stable air
Freezing level
15,453 ft
Altitude of the 32°F line
Cloud layers
low 0% · mid 0% · high 100%
Soil temp
84°
Ground surface
Vertical profile
Temperature and wind from the surface up through the upper atmosphere.
Climate
How today sits against the record
Open-Meteo archive, 2016–2026
This season's pace
A running total of heating and cooling demand in degree-days, measured against the multi-year average. It is a sum of degrees, not a count of days.
Heating degree-days· Since Oct 1
5,069(-17% vs normal)
Cooling degree-days· Since May 1
662(+67% vs normal)
Year to date
+5.2°warmer than the archive average
The year in temperature
2016–2026 avgAverage temperature each month, with heating and cooling degree-days, averaged across these years. This month is outlined.
September 18, across the years
2017–2025Each bar is September 18 only: observed low at the bottom, high at the top. Accent fill is 2026. Dashed lines are the archive’s typical high/low for that date.
Legend
- Frosted bars = other years
- Solid accent = 2026
- Accent dashes: avg high (September 18, archive mean).Neutral dashes: avg low for the same date.
UniColorado installs heat pumps, furnaces, AC, and electrical across Castle Pines and the Denver metro.