Extreme Heat Warning EXTREME HEAT WARNING - Plano, Collin County, Texas
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Updated: @ 20-Aug-2026 6:05am - next update at 6:10am  
Summary / Temperature Wind Precipitation Outlook


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

83.5°F Colder 1.5°F than last hour.
Warm
Currently 83.5, Max: 91.9, Min: 83.4 Feels like:
88°F

24-hr
difference
-0.2°FColder 0.2°F than yesterday at this time.
TEMP HIGH LOW
Today 91.9°F
12:00am
83.4°F
6:03am
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 SW SW
3.4
Gust:
2.2
Light Breeze

60-Min Avg: 4.6 mph
120-Min Avg: 3.5 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
Thursday

Thursday: Sunny
Sunny

Barometer Humidity/Dew Point Moon
Current: 29.896 inHg Rising 0.01 °F/hr
1-Hr Trend: Steady
3-Hr Trend: Rising slowly
High: 29.896  |  Low: 29.862
Humidity: 64 % Increased 5% since last hour.
Humidex: 98.9°F
Dewpoint: 70.0°F Increased 0.9°F since last hour.
Wetbulb: 74.4°F
Waxing Gibbous
Waxing Gibbous, Moon at 7 days in cycle
53%
Illuminated
UV Forecast Current Solar Energy
20-Aug-2026   Very High   9.9   
21-Aug-2026   Very High   9.7   
22-Aug-2026   Very High   10.0   
Energy: 0 W/m2 (0%)
High: 0 at  12:00am
Apparent Temp: 87.9°F
Heat Index Cooling Degree Days Sun
Current: 87.6°F
Today: 95.4°F  12:12am
Yesterday: 112.0°F
Last Week: 113.5°F
Record: 127.2°F   26-Aug-2023
Today: 6.2
August: 482.2
2026 to Date: 2375.8
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: 0.12 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: 1.16 kg/m3
Cloud Height: 3837 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:
8.2 at 06:05 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  -   Overnight's and Thursday's Outlook
Overnight

Overnight: Mostly Clear
Mostly Clear

Lo 83 °F
NWS forecast: Mostly clear. Low around 83, with temperatures rising to around 85 overnight. South southwest wind around 10 mph.
Thursday

Thursday: Sunny
Sunny

Hi 104 °F
NWS forecast: Sunny, with a high near 104. Heat index values as high as 109. South southwest wind 5 to 10 mph.
 NWS NWS Short Term Weather Forecast
Thursday

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

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

Sunday: Sunny
Sunny
Sunday
Night
Sunday Night: Mostly Clear
Mostly Clear
Hi 104 °F Lo 82 °F Hi 105 °F Lo 82 °F Hi 104 °F Lo 81 °F Hi 105 °F Lo 82 °F
US Radar & Infrared Satellite
US Radar National Infrared Satellite
Radar/Satellite images courtesy of Weather Underground.