Navigation

External Links

ThorntonWeather.com on Twitter

ThorntonWeather.com on Facebook

Alerts

Adams County
 Details for Adams County Air Quality Alert  +1 additional 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: 20-Jun-2026 @ 2:55pm   (0 sec ago)
Temperature Current Conditions Forecast / Storm Prediction
Currently Outside: Warmer 1.4°F than last hour.

79.5°F

24-hr diff: -1°FColder 1°F than yesterday at this time.
Warm
High Today
84.1°F
2:38 PM 		Low Today
55.0°F
5:33 AM
Yest High
83.1°F
3:40 PM 		Yest Low
58.9°F
6:56 AM
Sta* High
102.8°F
2025 		Sta* Low
46.3°F
2020
* This Station's Records Since 11/2006
Cloudy, Dry Cloudy, Dry

Wind from NW Wind:  NW
6.0
Gusting to:
 6.0 mph
Current Rain Rain:
0.00 in
Chandler Burning Index: LOW Current CBI
Fire Danger:
22.7 of 100
This
Afternoon
This Afternoon: Slight Chance Showers And Thunderstorms
Slight Chance Showers And T-Storms
Tonight

Tonight: Partly Cloudy
Partly Cloudy
Sunday

Sunday: Sunny
Sunny
Hi 92°F Lo 58°F Hi 91°F
SPC Activity Map
Dew Point Liquid Precipitation Wind Speed Sun/Moon
Current: Increased 1.4°F since last hour. 58.1°F
Last Hour: Increased 1.4°F since last hour. +1.4°F
High 2:32 PM: 60.5°F
Low 5:30 AM: 51.1°F
Record High: 73.2°F on
3-Aug-2007
Record Low: -17.3°F on
16-Jan-2024
Wetbulb: 66.6°F
Rain Today
rain graph
Today: 0.00 in
Yesterday: 0.00 in
Last 7 Days: 0.00 in
Jun Rain: 0.30 in
Jun to Date
  Avg:10 		1.18 in
Jun to Date
  Diff from Avg:10 		Under 0.88 in for the month 0.88 in
Jun Avg: 1.46 in
Diff from Avg: Under 1.16 in for the month 1.16 in
Season:1 3.95 in
YTD
  Avg:11 		7.79 in
YTD
  Diff from Avg:11 		Under 3.84 in for the year 3.84 in
Last Rain
Time/Date: 		8-Jun-2026
at 4:03 PM
31 rain days in 2026
3 days in June
11 days since last rain
Current: NW  6.0 mph
1Hr Average: 5.0 mph
Wind Run: 39.69 miles
Wind Gust
Current: 6.0 mph
Today: 13.0 mph 1:10 PM
Month: 28.0 mph 16-Jun
Year: 43.0 mph 25-Feb
Record Gust: 62.1 mph
17-Apr-2018
Sunlight:
15 h 0 m 23 s
of Sunlight Yesterday
15 h 0 m 27 s
of Sunlight Today Which is 4 sec longer than
yesterday
15 h 0 m 27 s
of Sunlight Tomorrow
 (Noon) graph (Midnight)
 Legend

Waxing Crescent
Waxing Crescent, 5 days, 18 hours, 2 minutes in cycle
38%
Illuminated
Humidity Barometer
Current: No Change 48%
Last Hour: No Change 0%
High 5:36 AM: 88%
Low 2:39 PM: 42%
Record High: 100%
12-Feb-2007
Record Low: 0%
1-Jan-2008
Current: Falling 0.028 inHg/hr 29.314 inHg
Last Hour: Falling
High 12:45 AM: 29.628
Low 2:54 PM: 29.314
Record High: 31.086 inHg
30-Dec-2014
Record Low: 25.130 inHg
17-Dec-2006
Cooling Degree Days Snow3 Heat Index Air
Today: 0.0
Jun: 97.8
2026 to Date: 172.5
Heating Degree Days
2026 to Date: 2417.0
Today: 0.00 in
Yesterday: 0.00 in
Jun Snow: No Change 0.00 in
Jun Avg: 0.00 in
Diff from Avg: 0.00 in
Season Total:2 28.00 in
Snow Depth: 0.00 in
0 snow days in June
13 snow days this season.2
First Snow of Season:
28-Nov-2025
Average 1st Snow:
29 of Oct
Current: 80.3°F
High 2:38pm: 84.1°F
Yesterday: 81.4°F
Record: 102.9°F
8-Jul-2021
Quality
Index6:
122

Unhealthy for Sensitive Groups
Density:
1.15 kg/m3
Current UV Index Current Solar Energy9
4.3
Sunburn in
26 Minutes 		Highest:
1:08 PM
9.1
443 W/m2
46%
W/m2 ⇒ SI 		High Today:
1:10 PM
 1093  W/m2
Record:
1461 W/m2
Almanac Irrigation Index5 Station All Time Records Cloud Level
Currently: Afternoon
YTD Avg Temp: 51.5°F
Sunrise: 5:31 am
Sunset: 8:31 pm
Moonrise: 11:54 am
Moonset: 12:09 am
Full Moon: 29-Jun-2026
New Moon: 09:44 UTC
14-Jul-2026
Updated at Midnight
Current ET: 0.23 in
7-Days Rain: 0.00 in
7-Days ET: 2.13 in
7-Day: 2.126 in water in deficit of what evaporated in last 7 days. 2.126 in
June: 4.67 in water in deficit of what evaporated this month. 4.67 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:19 | 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 20 of just the month of June for this station since 2006.   11 Historical average rain this season to day 20 of June for this station since 2006.
 NWS Weather Forecast  -   Outlook This Afternoon & Tonight
This
Afternoon
This Afternoon: Slight Chance Showers And Thunderstorms
Slight Chance Showers And T-Storms

Hi 92°F 		NWS forecast: A slight chance of showers and thunderstorms. Mostly sunny. High near 92, with temperatures falling to around 90 in the afternoon. North northwest wind 6 to 9 mph. Chance of precipitation is 20%.
 Tonight

Tonight: Partly Cloudy
Partly Cloudy

Lo 58°F 		NWS forecast: Partly cloudy. Low around 58, with temperatures rising to around 62 overnight. West northwest wind 2 to 14 mph, with gusts as high as 22 mph.
 NWS Short Term Weather Forecast
Sunday

Sunday: Sunny
Sunny
Sunday
Night
Sunday Night: Mostly Clear
Mostly Clear
Monday

Monday: Mostly Sunny then Slight Chance Showers And Thunderstorms
Mostly Sunny then Slight Chance Showers And T-Storms
Monday
Night
Monday Night: Mostly Clear
Mostly Clear
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 then Partly Cloudy
Chance Showers And T-Storms then Partly Cloudy
Wednesday

Wednesday: Mostly Sunny then Slight Chance Showers And Thunderstorms
Mostly Sunny then Slight Chance Showers And T-Storms
Hi 91°F Lo 55°F Hi 88°F Lo 56°F Hi 80°F Lo 55°F Hi 85°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