Extreme Heat Warning EXTREME HEAT WARNING - Plano, Collin County, Texas
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Updated: @ 21-Aug-2026 9:20pm - next update at 9:25pm  
Summary / Temperature Wind Precipitation Outlook


Night time, Dry, Clear
Night time, Dry, Clear

91.0°F Colder 2.3°F than last hour.
Hot
Currently 91.0, Max: 100.3, Min: 82.2 Feels like:
97°F

24-hr
difference
-4.9°FColder 4.9°F than yesterday at this time.
TEMP HIGH LOW
Today 100.3°F
4:41pm
82.2°F
7:07am
Yesterday 105.8°F
3:08pm
82.2°F
7:10am
Record 106°F
2023
62°F
1940
Normal 95°F
75°F
 Calm S
0.0
Gust:
0.0
Calm

60-Min Avg: Calm
120-Min Avg: 4.6 mph
Max Gust: 18.7 mph 11:49am
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
17 days since last rain
Saturday

Saturday: Mostly Sunny then Slight Chance Showers And Thunderstorms
Mostly Sunny then Slight Chance Showers And T-Storms

Barometer Humidity/Dew Point Moon
Current: 29.920 inHg Rising 0.01 °F/hr
1-Hr Trend: Steady
3-Hr Trend: Steady
High: 30.044  |  Low: 29.899
Humidity: 51 % Increased 5% since last hour.
Humidex: 106.7°F
Dewpoint: 70.4°F Increased 0.9°F since last hour.
Wetbulb: 76.9°F
Waxing Gibbous
Waxing Gibbous, Moon at 9 days in cycle
69%
Illuminated
UV Forecast Current Solar Energy
22-Aug-2026   Very High   9.9   
23-Aug-2026   Very High   10.1   
24-Aug-2026   Very High   9.0   
Energy: 0 W/m2 (0%)
High: 904 at  12:09pm
Apparent Temp: 97.6°F
Heat Index Cooling Degree Days Sun
Current: 96.9°F
Today: 109.1°F  4:41pm
Yesterday: 115.0°F
Last Week: 114.9°F
Record: 127.2°F   26-Aug-2023
Today: 21.1
August: 526.1
2026 to Date: 2419.8
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: 0.24 in   
7-Days Rain: 0.00 in   
7-Days ET: 2.22 in   
7-Day: -2.22 in 2.22 in water in deficit of what evaporated in last 7 days.
August: -6.22 in 6.22 in water in deficit of what evaporated this month.
Irrigation System: Ready
Other Conditions
Air Density: 1.14 kg/m3
Cloud Height: 5479 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:1 ISS:Ok CON:4.6 RCP:98%
Chandler Burning Index
Chandler Burning Index: LOW
Currently:
20.3 at 9:20 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  -   Tonight's and Saturday's Outlook
Tonight

Tonight: Partly Cloudy
Partly Cloudy

Lo 82 °F
NWS forecast: Partly cloudy. Low around 82, with temperatures rising to around 84 overnight. Heat index values as high as 99. South southeast wind 5 to 10 mph.
Saturday

Saturday: Mostly Sunny then Slight Chance Showers And Thunderstorms
Mostly Sunny then Slight Chance Showers And T-Storms

Hi 106 °F
NWS forecast: A slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 106. Heat index values as high as 107. South wind around 5 mph.
 NWS NWS Short Term Weather Forecast
Saturday

Saturday: Mostly Sunny then Slight Chance Showers And Thunderstorms
Mostly Sunny then Slight Chance Showers And T-Storms
Saturday
Night
Saturday Night: Slight Chance Showers And Thunderstorms then Mostly Clear
Slight Chance Showers And T-Storms then Mostly Clear
Sunday

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

Monday: Sunny
Sunny
Monday
Night
Monday Night: Clear then Slight Chance Rain Showers
Clear then Slight Chance Rain Showers
Tuesday

Tuesday: Slight Chance Rain Showers then Sunny
Slight Chance Rain Showers then Sunny
Tuesday
Night
Tuesday Night: Mostly Clear
Mostly Clear
Hi 106 °F Lo 82 °F Hi 105 °F Lo 84 °F Hi 106 °F Lo 84 °F Hi 106 °F Lo 83 °F
US Radar & Infrared Satellite
US Radar National Infrared Satellite
Radar/Satellite images courtesy of Weather Underground.