Extreme Heat Warning EXTREME HEAT WARNING - Plano, Collin County, Texas
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Updated: @ 22-Aug-2026 8:15am - next update at 8:20am  
Summary / Temperature Wind Precipitation Outlook


Sunny, Dry
Sunny, Dry

85.6°F Warmer 4.5°F than last hour.
Warm
Currently 85.6, Max: 88.3, Min: 80.3 Feels like:
90°F

24-hr
difference
0°F 
TEMP HIGH LOW
Today 88.3°F
12:04am
80.3°F
6:45am
Yesterday 100.3°F
4:41pm
82.2°F
7:07am
Record 105°F
2010
61°F
1956
Normal 95°F
75°F
 Wind from SW SW
2.1
Gust:
3.3
Light Air

60-Min Avg: Calm
120-Min Avg: Calm
Max Gust: 10.4 mph 1:17am
Month: 30.8 mph Aug 9
Today: 0.00 in
Yesterday: 0.00 in
Last
Rain:
8/4/2026
6:09 PM
August: 0.01 in
Last 7 Days: 0.00 in
Rain Season:1 22.54 in
Rain Days: 58 in 2026
18 days since last rain
Tonight

Tonight: Slight Chance Showers And Thunderstorms
Slight Chance Showers And T-Storms

Barometer Humidity/Dew Point Moon
Current: 29.980 inHg Rising 0.02 °F/hr
1-Hr Trend: Rising slowly
3-Hr Trend: Rising
High: 29.980  |  Low: 29.924
Humidity: 59 % Decreased 9% since last hour.
Humidex: 100.6°F
Dewpoint: 69.6°F Increased 0.1°F since last hour.
Wetbulb: 74.9°F
Waxing Gibbous
Waxing Gibbous, Moon at 9 days in cycle
72%
Illuminated
Current UV Index Current Solar Energy
   0.0   None
High: 0.0 @ 12:00am
Time to Burn: 720 Mins
Energy: 0 W/m2 (97%)
High: 128 at  8:14am
Apparent Temp: 97.3°F
Heat Index Cooling Degree Days Sun
Current: 89.8°F
Today: 95.1°F  12:10am
Yesterday: 109.1°F
Last Week: 114.9°F
Record: 127.2°F   26-Aug-2023
Today: 7.2
August: 538.3
2026 to Date: 2432.0
Heating Degree Days
2026 to Date: 930.5
Sunlight Hours
Possible hours of Daylight
13:11 hrs:min
-00:01:51 Min
Almanac Irrigation Index5 Station All Time Records Fire Risk
Sunrise: 6:54am
Sunset: 8:05pm
Moonrise: 4:47pm
Moonset: 1:28am
Full Moon: August 28 2026
New Moon: 03:28 UTC September 11 2026
Updated at Midnight
Current: 0.05 in   
7-Days Rain: 0.00 in   
7-Days ET: 2.06 in   
7-Day: -2.06 in 2.06 in water in deficit of what evaporated in last 7 days.
August: -6.44 in 6.44 in water in deficit of what evaporated this month.
Irrigation System: Standby
Other Conditions
Air Density: 1.16 kg/m3
Cloud Height: 4411 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:98%
Chandler Burning Index
Chandler Burning Index: LOW
Currently:
11.9 at 08:15 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: Mostly Sunny then Slight Chance Showers And Thunderstorms
Mostly Sunny then Slight Chance Showers And T-Storms

Hi 104 °F
NWS forecast: A slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 104. Heat index values as high as 105. South southwest wind around 5 mph.
Tonight

Tonight: Slight Chance Showers And Thunderstorms
Slight Chance Showers And T-Storms

Lo 82 °F
NWS forecast: A slight chance of showers and thunderstorms before 1am. Partly cloudy. Low around 82, with temperatures rising to around 84 overnight. Heat index values as high as 103. South southeast wind 5 to 10 mph. New rainfall amounts less than a tenth of an inch possible.
 NWS NWS Short Term Weather Forecast
Tonight

Tonight: Slight Chance Showers And Thunderstorms
Slight Chance Showers And T-Storms
Sunday

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

Monday: Sunny
Sunny
Monday
Night
Monday Night: Mostly Clear
Mostly Clear
Tuesday

Tuesday: Sunny
Sunny
Tuesday
Night
Tuesday Night: Mostly Clear
Mostly Clear
Wednesday

Wednesday: Sunny
Sunny
Lo 82 °F Hi 105 °F Lo 84 °F Hi 105 °F Lo 84 °F Hi 106 °F Lo 83 °F Hi 104 °F
US Radar & Infrared Satellite
US Radar National Infrared Satellite
Radar/Satellite images courtesy of Weather Underground.