Navigation

External Links

ThorntonWeather.com on Twitter

ThorntonWeather.com on Facebook

Alerts

Adams County
 Details for Adams County Air Quality Alert
Air Quality Alert AIR QUALITY ALERT - Adams County

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: 17-Aug-2026 @ 5:25pm   (0 sec ago)
Temperature Current Conditions Forecast / Storm Prediction
Currently Outside: Colder 1.8°F than last hour.

91.2°F

Heat Index:  87.4°F
Feels like:  87°F
24-hr diff: 11.6°FWarmer 11.6°F than yesterday at this time.
Hot
High Today
94.5°F
3:12 PM 		Low Today
57.3°F
6:12 AM
Yest High
85.4°F
2:48 PM 		Yest Low
59.4°F
2:48 AM
Sta* High
98.8°F
2024 		Sta* Low
47.2°F
2009
* This Station's Records Since 11/2006
Sunny, Dry Sunny, Dry

Wind from ENE Wind:  ENE
5.3
Gusting to:
 5.0 mph
Current Rain Rain:
0.00 in
Chandler Burning Index: EXTREME Current CBI
Fire Danger:
106.8 of 100
This
Afternoon
This Afternoon: Mostly Sunny
Mostly Sunny
Tonight

Tonight: Mostly Clear
Mostly Clear
Tuesday

Tuesday: Mostly Sunny then Slight Chance Showers And Thunderstorms
Mostly Sunny then Slight Chance Showers And T-Storms
Hi 92°F Lo 62°F Hi 92°F
SPC Activity Map
Dew Point Liquid Precipitation Wind Speed Sun/Moon
Current: Decreased 4.3°F since last hour. 43.2°F
Last Hour: Decreased 4.3°F since last hour. -4.3°F
High 9:17 AM: 61.0°F
Low 5:02 PM: 39.7°F
Record High: 73.2°F on
3-Aug-2007
Record Low: -17.3°F on
16-Jan-2024
Wetbulb: 65.0°F
Rain Today
rain graph
Today: 0.00 in
Yesterday: 0.00 in
Last 7 Days: 0.21 in
Aug Rain: 0.21 in
Aug to Date
  Avg:10 		0.80 in
Aug to Date
  Diff from Avg:10 		Under 0.59 in for the month 0.59 in
Aug Avg: 1.06 in
Diff from Avg: Under 0.85 in for the month 0.85 in
Season:1 5.70 in
YTD
  Avg:11 		10.63 in
YTD
  Diff from Avg:11 		Under 4.93 in for the year 4.93 in
Last Rain
Time/Date: 		15-Aug-2026
at 2:27 PM
45 rain days in 2026
4 days in August
1 day since last rain
Current: ENE  5.3 mph
1Hr Average: 4.5 mph
Wind Run: 38.35 miles
Wind Gust
Current: 5.0 mph
Today: 14.0 mph 2:43 PM
Month: 31.0 mph 8-Aug
Year: 43.0 mph 25-Feb
Record Gust: 62.1 mph
17-Apr-2018
Sunlight:
13 h 42 m 17 s
of Sunlight Yesterday
13 h 39 m 58 s
of Sunlight Today Which is
2 min 19 sec shorter than
yesterday
13 h 37 m 37 s
of Sunlight Tomorrow
 (Noon) graph (Midnight)
 Legend

Waxing Crescent
Waxing Crescent, 5 days, 5 hours, 53 minutes in cycle
28%
Illuminated
Humidity Barometer
Current: Decreased 2% since last hour. 19%
Last Hour: Decreased 2% since last hour. 2%
High 5:54 AM: 92%
Low 4:01 PM: 16%
Record High: 100%
12-Feb-2007
Record Low: 0%
1-Jan-2008
Current: Falling 0.013 inHg/hr 29.613 inHg
Last Hour: Steady
High 6:55 AM: 29.805
Low 5:07 PM: 29.610
Record High: 31.086 inHg
30-Dec-2014
Record Low: 25.130 inHg
17-Dec-2006
Cooling Degree Days Snow3 Heat Index Air
Today: 1.1
Aug: 167.8
2026 to Date: 840.8
Heating Degree Days
2026 to Date: 2418.3
Today: 0.00 in
Yesterday: 0.00 in
Aug Snow: No Change 0.00 in
Aug Avg: 0.00 in
Diff from Avg: 0.00 in
Season Total:2 0.00 in
Snow Depth: 0.00 in
0 snow days in August
0 snow days this season.2
First Snow of Season:
8-Jan-2026
Average 1st Snow:
29 of Oct
Current: 87.4°F
High 3:12pm: 90.7°F
Yesterday: 85.4°F
Record: 103.5°F
26-Jul-2026
Quality
Index6:
97

Moderate
Density:
1.14 kg/m3
Current UV Index Current Solar Energy9
1.8
Sunburn in
62 Minutes 		Highest:
12:48 PM
7.9
417 W/m2
100%
W/m2 ⇒ SI 		High Today:
1:53 PM
 893  W/m2
Record:
1461 W/m2
Almanac Irrigation Index5 Station All Time Records Cloud Level
Currently: Afternoon
YTD Avg Temp: 57.9°F
Sunrise: 6:13 am
Sunset: 7:54 pm
Moonrise: 11:43 am
Moonset: 9:42 pm
Full Moon: 27-Aug-2026
New Moon: 03:28 UTC
10-Sep-2026
Updated at Midnight
Current ET: 0.28 in
7-Days Rain: 0.21 in
7-Days ET: 1.37 in
7-Day: 1.16 in water in deficit of what evaporated in last 7 days. 1.16 in
August: 3.55 in water in deficit of what evaporated this month. 3.55 in
Support this Site!
Your donation helps support this site
HIGHS: LOWS:
104.4°F
25-Jul-2026 		-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:0 | S3C2:1 | Ajax 3.xx
ISS:Ok | CON:4.7 | RCP:99%
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.   9 Solar Index represents either an absolute scale of solar energy (W/m²) using the station’s recorded maximum or a percentage of computed theoretical solar maximum using the station’s location and time of day. These indices differ most when the sun is low on the horizon. The current scale is shown, and will toggle if it or the icon is clicked.   10 Historical average only to day 17 of just the month of August for this station since 2006.   11 Historical average rain this season to day 17 of August for this station since 2006.
 NWS Weather Forecast  -   Outlook This Afternoon & Tonight
This
Afternoon
This Afternoon: Mostly Sunny
Mostly Sunny

Hi 92°F 		NWS forecast: Mostly sunny, with a high near 92. East wind around 7 mph.
 Tonight

Tonight: Mostly Clear
Mostly Clear

Lo 62°F 		NWS forecast: Mostly clear. Low around 62, with temperatures rising to around 64 overnight. South southwest wind around 7 mph.
 NWS Short Term Weather Forecast
Tuesday

Tuesday: Mostly Sunny then Slight Chance Showers And Thunderstorms
Mostly Sunny then Slight Chance Showers And T-Storms
Tuesday
Night
Tuesday Night: Chance Showers And Thunderstorms
Chance Showers And T-Storms
Wednesday

Wednesday: Mostly Sunny then Chance Showers And Thunderstorms
Mostly Sunny then Chance Showers And T-Storms
Wednesday
Night
Wednesday Night: Slight Chance Showers And Thunderstorms then Mostly Clear
Slight Chance Showers And T-Storms then Mostly Clear
Thursday

Thursday: Sunny
Sunny
Thursday
Night
Thursday Night: Partly Cloudy
Partly Cloudy
Friday

Friday: Sunny
Sunny
Hi 92°F Lo 61°F Hi 88°F Lo 60°F Hi 89°F Lo 63°F Hi 94°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