Navigation

External Links

ThorntonWeather.com on Twitter

ThorntonWeather.com on Facebook

Alerts


No alerts
No Warnings, Watches, or Advisories

Current Radar
Thornton, Colorado current radar
Click for larger view 		Current Webcam
Thornton, Colorado current webcam image
Click for larger view 		Latest News
powered by Surfing Waves
spacer
METRIC | IMPERIAL
Updated: 04-Sep-2025 @ 6:10am   (0 sec ago)
Temperature Current Conditions Forecast / Storm Prediction
Currently Outside: Colder 2.7°F than last hour.

52.5°F

24-hr diff: 0.1°FWarmer 0.1°F than yesterday at this time.
Cool
High Today
70.3°F
12:00 AM 		Low Today
52.5°F
6:08 AM
Yest High
87.0°F
3:13 PM 		Yest Low
51.9°F
5:47 AM
Sta* High
96.0°F
2022 		Sta* Low
43.3°F
2011
* This Station's Records Since 11/2006
Dawn, Dry, Clear skies Dawn, Dry, Clear skies

Calm Wind:  SW
0.0
Gusting to:
 0.0 mph
Current Rain Rain:
0.00 in
Chandler Burning Index: LOW Current CBI
Fire Danger:
3.0 of 100
Overnight

Overnight: Mostly Clear
Mostly Clear
Thursday

Thursday: Mostly Sunny
Mostly Sunny
Thursday
Night
Thursday Night: Slight Chance Showers And Thunderstorms then Smoke
Slight Chance Showers And T-Storms then Smoke
Lo 57°F Hi 89°F Lo 53°F
SPC Activity Map
Dew Point Liquid Precipitation Wind Speed Sun/Moon
Current: Increased 0.6°F since last hour. 43.0°F
Last Hour: Increased 0.6°F since last hour. +0.6°F
High 6:09 AM: 43.0°F
Low 3:06 AM: 39.9°F
Record High: 73.2°F on
3-Aug-2007
Record Low: -17.3°F on
16-Jan-2024
Wetbulb: 48.0°F
Rain Today
rain graph
Today: 0.00 in
Yesterday: 0.00 in
Last 7 Days: 0.20 in
Sep Rain: 0.00 in
Sep to Date
  Avg:10 		0.04 in
Sep to Date
  Diff from Avg:10 		Under 0.04 in for the month 0.04 in
Sep Avg: 1.44 in
Diff from Avg: Under 1.44 in for the month 1.44 in
Season:1 8.94 in
YTD
  Avg:11 		11.15 in
YTD
  Diff from Avg:11 		Under 2.21 in for the year 2.21 in
Last Rain
Time/Date: 		31-Aug-2025
at 6:50 AM
60 rain days in 2025
0 days in September
4 days since last rain
Current: SW  0.0 mph
1Hr Average: Calm
Wind Run: 4.12 miles
Wind Gust
Current: 0.0 mph
Today: 10.4 mph 12:32 AM
Month: 22.0 mph 2-Sep
Year: 47.2 mph 3-Mar
Record Gust: 62.1 mph
17-Apr-2018
Sunlight:
12 h 57 m 46 s
of Sunlight Yesterday
12 h 55 m 14 s
of Sunlight Today Which is
2 min 32 sec shorter than
yesterday
12 h 52 m 41 s
of Sunlight Tomorrow
 (Noon) graph (Midnight)
 Legend

Waxing Gibbous
Waxing Gibbous, 12 days, 6 hours, 8 minutes in cycle
89%
Illuminated
Humidity Barometer
Current: Increased 8% since last hour. 70%
Last Hour: Increased 8% since last hour. 8%
High 6:09 AM: 70%
Low 12:00 AM: 35%
Record High: 100%
12-Feb-2007
Record Low: 0%
1-Jan-2008
Current: Rising 0.012 inHg/hr 29.533 inHg
Last Hour: Steady
High 12:00 AM: 29.613
Low 5:20 AM: 29.515
Record High: 31.086 inHg
30-Dec-2014
Record Low: 25.130 inHg
17-Dec-2006
Heating Degree Days Snow3 Wind Chill Air
Today: 0.2
Sep: 0.2
2025 to Date: 3402.4
Cooling Degree Days
2025 to Date: 775.5
Today: 0.00 in
Yesterday: 0.00 in
Sep Snow: Under 0.118 in for the month 0.00 in
Sep Avg: 0.12 in
Diff from Avg: -0.12 in
Season Total:2 0.00 in
Snow Depth: 0.00 in
0 snow days in September
0 snow days this season.2
First Snow of Season:
7-Jan-2025
Average 1st Snow:
27 of Oct
Current: 52.5°F
Low 6:08 AM: 52.5°F
Yesterday: 51.9°F
Record: -31.0°F
22-Dec-2022
Quality
Index6:
65

Moderate
Density:
1.22 kg/m3
UV Summary/Forecast Solar Summary
High Yest:   6.7 @ 12:49 PM
Sep-04

8.2 		Sep-05

8.0 		Sep-06

7.7
High Yest:   780.0 @ 12:48 PM
Sun Hours Today:
00:00
   This Month: 29:22 Hrs
Rise: 6:30 am  Set: 7:27 pm
Almanac Irrigation Index5 Station All Time Records Cloud Level
Currently: Early Morning
YTD Avg Temp: 54.3°F
Sunrise: 6:30 am
Sunset: 7:27 pm
Moonrise: 5:32 pm
Moonset: 2:42 am
Full Moon: 07-Sep-2025
New Moon: 19:55 UTC
21-Sep-2025
Updated at Midnight
Current ET: 0.04 in
7-Days Rain: 0.20 in
7-Days ET: 0.96 in
7-Day: 0.757 in water in deficit of what evaporated in last 7 days. 0.757 in
September: 0.51 in water in deficit of what evaporated this month. 0.51 in
Support this Site!
Your donation helps support this site
HIGHS: LOWS:
102.9°F
25-Jun-2012 		-14.6°F
2-Feb-2011
Daytime Records
  100.6°F°F
12-Jul-2024 		  -8.1°F°F
22-Dec-2022
Nitetime Records
  88.0°F°F
15-Aug-2012 		  -10.7°F°F
02-Feb-2011
ICN:1 | S3C2:1 | Ajax 3.xx
ISS:Ok | CON:4.7 | RCP:98%
1 Rain season: Jan 1st to Dec 31st.   2 Snow season July 1st to June 30th.   3 Snow manually measured usually around 5AM and 5PM.   5 Estimated amount of water needed to replace the water used by plants and evaporation from the past week. (Negative numbers mean amount of water needed, positive numbers mean excess water is present).   6 Air Quality Index is provided by Colorado Department of Public Health & Environment.   10 Historical average only to day 4 of just the month of September for this station since 2006.   11 Historical average rain this season to day 4 of September for this station since 2006.
 NWS Weather Forecast  -   Outlook Overnight & Thursday
Overnight

Overnight: Mostly Clear
Mostly Clear

Lo 57°F 		NWS forecast: Mostly clear. Low around 57, with temperatures rising to around 62 overnight. Southwest wind around 6 mph.
 Thursday

Thursday: Mostly Sunny
Mostly Sunny

Hi 89°F 		NWS forecast: Mostly sunny. High near 89, with temperatures falling to around 86 in the afternoon. Northwest wind 3 to 9 mph.
 NWS Short Term Weather Forecast
Thursday
Night
Thursday Night: Slight Chance Showers And Thunderstorms then Smoke
Slight Chance Showers And T-Storms then Smoke
Friday

Friday: Partly Sunny then Slight Chance Showers And Thunderstorms
Partly Sunny then Slight Chance Showers And T-Storms
Friday
Night
Friday Night: Mostly Clear
Mostly Clear
Saturday

Saturday: Sunny
Sunny
Saturday
Night
Saturday Night: Mostly Cloudy
Mostly Cloudy
Sunday

Sunday: Partly Sunny then Slight Chance Showers And Thunderstorms
Partly Sunny then Slight Chance Showers And T-Storms
Sunday
Night
Sunday Night: Mostly Cloudy
Mostly Cloudy
Lo 53°F Hi 72°F Lo 49°F Hi 78°F Lo 53°F Hi 80°F Lo 55°F
Click here for the complete forecast.
ajax-dashboard6.php - Version 6.95h - 20-Feb-2023 - Script by: Scott of BurnsvilleWeatherLIVE.com
Now supported by Saratoga-weather.org Download