Extreme Heat Warning EXTREME HEAT WARNING - Plano, Collin County, Texas
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Updated: @ 20-Aug-2026 3:20pm - next update at 3:25pm  
Summary / Temperature Wind Precipitation Outlook


Mostly sunny, Dry
Mostly sunny, Dry

104.5°F Warmer 0.7°F than last hour.
Dangerously Hot
Currently 104.5, Max: 105.8, Min: 82.2 Feels like:
111°F

24-hr
difference
0.5°FWarmer 0.5°F than yesterday at this time.
TEMP HIGH LOW
Today 105.8°F
3:08pm
82.2°F
7:10am
Yesterday 105.4°F
4:12pm
82.5°F
7:10am
Record 109°F
2023
58°F
1940
Normal 96°F
76°F
 Wind from E E
5.8
Gust:
4.4
Light Breeze

60-Min Avg: 3.5 mph
120-Min Avg: 6.9 mph
Max Gust: 19.8 mph 2:26am
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
16 days since last rain
Tonight

Tonight: Slight Chance Showers And Thunderstorms then Mostly Clear
Slight Chance Showers And T-Storms then Mostly Clear

Barometer Humidity/Dew Point Moon
Current: 29.893 inHg Falling 0.03 °F/hr
1-Hr Trend: Falling slowly
3-Hr Trend: Falling
High: 29.975  |  Low: 29.862
Humidity: 31 % Decreased 5% since last hour.
Humidex: 118.0°F
Dewpoint: 67.8°F Decreased 3.3°F since last hour.
Wetbulb: 79.5°F
Waxing Gibbous
Waxing Gibbous, Moon at 8 days in cycle
57%
Illuminated
Current UV Index Current Solar Energy
   4.0    Medium 
High: 5.3 @ 1:19pm
Time to Burn: 28 Mins
Energy: 0 W/m2 (77%)
High: 804 at  1:21pm
Apparent Temp: 122.4°F
Heat Index Cooling Degree Days Sun
Current: 111.4°F
Today: 114.9°F  3:07pm
Yesterday: 112.0°F
Last Week: 114.7°F
Record: 127.2°F   26-Aug-2023
Today: 14.7
August: 490.8
2026 to Date: 2384.3
Heating Degree Days
2026 to Date: 930.5
Sunlight Hours
Possible hours of Daylight
13:14 hrs:min
-00:01:49 Min
Almanac Irrigation Index5 Station All Time Records Fire Risk
Sunrise: 6:53am
Sunset: 8:07pm
Moonrise: 2:58pm
Moonset: 11:58pm
Full Moon: August 28 2026
New Moon: 03:28 UTC September 11 2026
Updated at Midnight
Current: 0.36 in   
7-Days Rain: 0.00 in   
7-Days ET: 2.29 in   
7-Day: -2.29 in 2.29 in water in deficit of what evaporated in last 7 days.
August: -5.89 in 5.89 in water in deficit of what evaporated this month.
Irrigation System: Standby
Other Conditions
Air Density: 1.12 kg/m3
Cloud Height: 9151 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: MODERATE
Currently:
62.8 at 3:20 PM
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  -   This Afternoon's and Tonight's Outlook
This
Afternoon
This Afternoon: Sunny
Sunny

Hi 104 °F
NWS forecast: Sunny, with a high near 104. Heat index values as high as 109. South wind around 5 mph.
Tonight

Tonight: Slight Chance Showers And Thunderstorms then Mostly Clear
Slight Chance Showers And T-Storms then Mostly Clear

Lo 82 °F
NWS forecast: A slight chance of showers and thunderstorms between 7pm and 10pm. Mostly clear. Low around 82, with temperatures rising to around 85 overnight. Heat index values as high as 106. South wind around 5 mph.
 NWS NWS Short Term Weather Forecast
Tonight

Tonight: Slight Chance Showers And Thunderstorms then Mostly Clear
Slight Chance Showers And T-Storms then Mostly Clear
Friday

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

Saturday: Sunny
Sunny
Saturday
Night
Saturday Night: Mostly Clear
Mostly Clear
Sunday

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

Monday: Sunny
Sunny
Lo 82 °F Hi 105 °F Lo 82 °F Hi 106 °F Lo 81 °F Hi 105 °F Lo 83 °F Hi 105 °F
US Radar & Infrared Satellite
US Radar National Infrared Satellite
Radar/Satellite images courtesy of Weather Underground.