Navigation

External Links

ThorntonWeather.com on Twitter

ThorntonWeather.com on Facebook

Alerts

Adams County
 Details for Adams County Winter Storm Watch  +1 additional alert
 Thornton
 Details for Thornton Winter Storm Watch
Winter Storm Watch WINTER STORM WATCH - Adams County  - Thornton
Winter Weather Advisory WINTER WEATHER ADVISORY - 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: 04-May-2026 @ 9:00am   (0 sec ago)
Temperature Current Conditions Forecast / Storm Prediction
Currently Outside: Warmer 5.1°F than last hour.

59.5°F

24-hr diff: 1.1°FWarmer 1.1°F than yesterday at this time.
Cool
High Today
60.4°F
8:34 AM 		Low Today
42.3°F
4:47 AM
Yest High
78.4°F
1:23 PM 		Yest Low
43.1°F
5:00 AM
Sta* High
87.9°F
2012 		Sta* Low
31.0°F
2017
* This Station's Records Since 11/2006
Mostly cloudy, Dry Mostly cloudy, Dry

Wind from S Wind:  S
1.8
Gusting to:
 1.0 mph
Current Rain Rain:
0.00 in
Chandler Burning Index: LOW Current CBI
Fire Danger:
47.4 of 100
Today

Today: Mostly Cloudy then Chance Showers And Thunderstorms
Mostly Cloudy then Chance Showers And T-Storms
Tonight

Tonight: Showers And Thunderstorms Likely then Light Rain
Showers And T-Storms Likely then Light Rain
Tuesday

Tuesday: Rain And Snow
Rain And Snow
Hi 73°F Lo 39°F Hi 42°F
SPC Activity Map
Dew Point Liquid Precipitation Wind Speed Sun/Moon
Current: Increased 0.1°F since last hour. 30.3°F
Last Hour: Increased 0.1°F since last hour. +0.1°F
High 8:14 AM: 32.1°F
Low 12:03 AM: 26.7°F
Record High: 73.2°F on
3-Aug-2007
Record Low: -17.3°F on
16-Jan-2024
Wetbulb: 47.3°F
Rain Today
rain graph
Today: 0.00 in
Yesterday: 0.00 in
Last 7 Days: 0.04 in
May Rain: 0.00 in
May to Date
  Avg:10 		0.31 in
May to Date
  Diff from Avg:10 		Under 0.31 in for the month 0.31 in
May Avg: 2.98 in
Diff from Avg: Under 2.98 in for the month 2.98 in
Season:1 1.35 in
YTD
  Avg:11 		3.97 in
YTD
  Diff from Avg:11 		Under 2.62 in for the year 2.62 in
Last Rain
Time/Date: 		28-Apr-2026
at 11:10 PM
16 rain days in 2026
0 days in May
5 days since last rain
Current: S  1.8 mph
1Hr Average: 2.6 mph
Wind Run: 14.13 miles
Wind Gust
Current: 1.0 mph
Today: 13.0 mph 12:44 AM
Month: 25.0 mph 3-May
Year: 43.0 mph 25-Feb
Record Gust: 62.1 mph
17-Apr-2018
Sunlight:
13 h 59 m 23 s
of Sunlight Yesterday
14 h 1 m 34 s
of Sunlight Today Which is
2 min 11 sec longer than
yesterday
14 h 3 m 44 s
of Sunlight Tomorrow
 (Noon) graph (Midnight)
 Legend

Waning Gibbous
Waning Gibbous, 17 days, 3 hours, 11 minutes in cycle
92%
Illuminated
Humidity Barometer
Current: Decreased 7% since last hour. 33%
Last Hour: Decreased 7% since last hour. 7%
High 4:45 AM: 59%
Low 12:00 AM: 31%
Record High: 100%
12-Feb-2007
Record Low: 0%
1-Jan-2008
Current: Falling 0.008 inHg/hr 29.422 inHg
Last Hour: Steady
High 12:28 AM: 29.482
Low 8:59 AM: 29.422
Record High: 31.086 inHg
30-Dec-2014
Record Low: 25.130 inHg
17-Dec-2006
Heating Degree Days Snow3 Wind Chill Air
Today: 5.3
May: 35.2
2026 to Date: 2218.8
Cooling Degree Days
2026 to Date: 32.1
Today: 0.00 in
Yesterday: 0.00 in
May Snow: Under 1.496 in for the month 0.00 in
May Avg: 1.50 in
Diff from Avg: -1.50 in
Season Total:2 22.40 in
Snow Depth: 0.00 in
0 snow days in May
11 snow days this season.2
First Snow of Season:
28-Nov-2025
Average 1st Snow:
29 of Oct
Current: 59.5°F
Low 4:52 AM: 41.5°F
Yesterday: 40.9°F
Record: -31.0°F
22-Dec-2022
Quality
Index6:
N/A

No Data
Density:
1.20 kg/m3
Current UV Index Current Solar Energy9
1.2
Sunburn in
93 Minutes 		Highest:
8:56 AM
1.2
292 W/m2
48%
W/m2 ⇒ SI 		High Today:
8:59 AM
 292  W/m2
Record:
1461 W/m2
Almanac Irrigation Index5 Station All Time Records Cloud Level
Currently: Morning
YTD Avg Temp: 46.8°F
Sunrise: 5:56 am
Sunset: 7:56 pm
Moonrise: 10:30 pm
Moonset: 7:20 am
Full Moon: 01-May-2026
New Moon: 20:02 UTC
16-May-2026
Updated at Midnight
Current ET: 0.06 in
7-Days Rain: 0.04 in
7-Days ET: 0.90 in
7-Day: 0.858 in water in deficit of what evaporated in last 7 days. 0.858 in
May: 0.58 in water in deficit of what evaporated this month. 0.58 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:5 | S3C2:1 | Ajax 3.xx
ISS:Ok | CON:4.7 | RCP:100%
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 4 of just the month of May for this station since 2006.   11 Historical average rain this season to day 4 of May for this station since 2006.
 NWS Weather Forecast  -   Outlook Today & Tonight
Today

Today: Mostly Cloudy then Chance Showers And Thunderstorms
Mostly Cloudy then Chance Showers And T-Storms

Hi 73°F 		NWS forecast: A chance of showers and thunderstorms between noon and 3pm, then a chance of showers and thunderstorms. Mostly cloudy. High near 73, with temperatures falling to around 66 in the afternoon. West northwest wind 6 to 12 mph, with gusts as high as 18 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
 Tonight

Tonight: Showers And Thunderstorms Likely then Light Rain
Showers And T-Storms Likely then Light Rain

Lo 39°F 		NWS forecast: Showers and thunderstorms likely before midnight, then rain. Cloudy. Low around 39, with temperatures rising to around 43 overnight. North northeast wind 7 to 12 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
 NWS Short Term Weather Forecast
Tuesday

Tuesday: Rain And Snow
Rain And Snow
Tuesday
Night
Tuesday Night: Rain And Snow
Rain And Snow
Wednesday

Wednesday: Snow then Snow Showers Likely
Snow then Snow Showers Likely
Wednesday
Night
Wednesday Night: Mostly Clear
Mostly Clear
Thursday

Thursday: Sunny
Sunny
Thursday
Night
Thursday Night: Slight Chance Showers And Thunderstorms then Partly Cloudy
Slight Chance Showers And T-Storms then Partly Cloudy
Friday

Friday: Mostly Sunny then Slight Chance Showers And Thunderstorms
Mostly Sunny then Slight Chance Showers And T-Storms
Hi 42°F Lo 31°F Hi 43°F Lo 30°F Hi 67°F Lo 42°F Hi 71°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