Extreme Heat Warning EXTREME HEAT WARNING - Plano, Collin County, Texas
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Updated: @ 21-Jul-2026 6:40am - next update at 6:45am  
Summary / Temperature Wind Precipitation Outlook


Dawn
Dawn

78.9°F Colder 1.2°F than last hour.
Warm
Currently 78.9, Max: 88.0, Min: 78.8 Feels like:
81°F

24-hr
difference
-1.7°FColder 1.7°F than yesterday at this time.
TEMP HIGH LOW
Today 88.0°F
12:00am
78.8°F
6:37am
Yesterday 100.5°F
4:21pm
80.5°F
6:40am
Record 109°F
2018
66°F
1989
Normal 96°F
76°F
 Calm SSW
0.0
Gust:
0.0
Calm

60-Min Avg: Calm
120-Min Avg: 1.2 mph
Max Gust: 11.5 mph 12:06am
Month: 42.9 mph Jul 15
Today: 0.00 in
Yesterday: 0.00 in
Last
Rain:
7/19/2026
7:45 PM
July: 1.48 in
Last 7 Days: 0.67 in
Rain Season:1 22.53 in
Rain Days: 57 in 2026
2 days since last rain
Tonight

Tonight: Clear
Clear

Barometer Humidity/Dew Point Moon
Current: 29.867 inHg Rising 0.02 °F/hr
1-Hr Trend: Steady
3-Hr Trend: Rising
High: 29.872  |  Low: 29.824
Humidity: 71 % Increased 3% since last hour.
Humidex: 93.1°F
Dewpoint: 68.7°F Increased 0.1°F since last hour.
Wetbulb: 72.2°F
First Quarter
First Quarter, Moon at 7 days in cycle
50%
Illuminated
Current UV Index Current Solar Energy
   0.0   None
High: 0.0 @ 12:00am
Time to Burn: 720 Mins
Energy: 0 W/m2 (0%)
High: 5 at  6:39am
Apparent Temp: 84.5°F
Heat Index Cooling Degree Days Sun
Current: 81.3°F
Today: 92.8°F  12:01am
Yesterday: 112.6°F
Last Week: 111.6°F
Record: 127.2°F   26-Aug-2023
Today: 5.7
July: 424.9
2026 to Date: 1619.8
Heating Degree Days
2026 to Date: 930.5
Sunlight Hours
Possible hours of Daylight
14:01 hrs:min
-00:01:10 Min
Almanac Irrigation Index5 Station All Time Records Fire Risk
Sunrise: 6:33am
Sunset: 8:34pm
Moonrise: 2:11pm
Moonset: 12:20am
Full Moon: July 29 2026
New Moon: 17:37 UTC August 12 2026
Updated at Midnight
Current: 0.07 in   
7-Days Rain: 0.67 in   
7-Days ET: 1.67 in   
7-Day: -1 in 1 in water in deficit of what evaporated in last 7 days.
July: -3.74 in 3.74 in water in deficit of what evaporated this month.
Irrigation System: Ready
Other Conditions
Air Density: 1.17 kg/m3
Cloud Height: 3091 ft
HIGHS: LOWS:
111.0°F
Aug 18 2023
-2.0°F
Feb 16 2021
Daytime Records
108.1°F
Aug 19 2024
3.6°F
Feb 15 2021
Nitetime Records
95.2°F
Aug 11 2023
2.1°F
Feb 16 2021
ICN:0 ISS:Ok CON:4.6 RCP:99%
Chandler Burning Index
Chandler Burning Index: LOW
Currently:
4.3 at 06:40 AM
1 Rain season: Jan 1st to Dec 31st.    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.)
 NWS Weather Forecast  -   Today's and Tonight's Outlook
Today

Today: Sunny
Sunny

Hi 104 °F
NWS forecast: Sunny, with a high near 104. Heat index values as high as 112. West northwest wind around 5 mph.
Tonight

Tonight: Clear
Clear

Lo 84 °F
NWS forecast: Clear. Low around 84, with temperatures rising to around 86 overnight. Heat index values as high as 110. South southeast wind 0 to 5 mph.
 NWS NWS Short Term Weather Forecast
Tonight

Tonight: Clear
Clear
Wednesday

Wednesday: Sunny
Sunny
Wednesday
Night
Wednesday Night: Mostly Clear
Mostly Clear
Thursday

Thursday: Sunny
Sunny
Thursday
Night
Thursday Night: Mostly Clear
Mostly Clear
Friday

Friday: Sunny
Sunny
Friday
Night
Friday Night: Mostly Clear
Mostly Clear
Saturday

Saturday: Mostly Sunny
Mostly Sunny
Lo 84 °F Hi 103 °F Lo 80 °F Hi 99 °F Lo 80 °F Hi 101 °F Lo 83 °F Hi 101 °F
US Radar & Infrared Satellite
US Radar National Infrared Satellite
Radar/Satellite images courtesy of Weather Underground.