Heat Advisory HEAT ADVISORY - Plano, Collin County, Texas
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Updated: @ 12-Sep-2026 1:50pm - next update at 1:55pm  
Summary / Temperature Wind Precipitation Outlook


Mostly sunny, Dry
Mostly sunny, Dry

99.5°F Warmer 2.6°F than last hour.
Dangerously Hot
Currently 99.5, Max: 100.2, Min: 76.1 Feels like:
115°F

24-hr
difference
3.9°FWarmer 3.9°F than yesterday at this time.
TEMP HIGH LOW
Today 100.2°F
1:40pm
76.1°F
7:16am
Yesterday 100.2°F
4:19pm
77.4°F
4:51am
Record 103°F
2011
50°F
1902
Normal 90°F
70°F
 Wind from E E
3.5
Gust:
8.8
Light Breeze

60-Min Avg: 4.6 mph
120-Min Avg: 6.9 mph
Max Gust: 16.5 mph 12:23pm
Month: 26.5 mph Sep 11
Today: 0.00 in
Yesterday: 0.00 in
Last
Rain:
8/4/2026
6:09 PM
September: 0.00 in
Last 7 Days: 0.00 in
Rain Season:1 22.54 in
Rain Days: 58 in 2026
39 days since last rain
Tonight

Tonight: Mostly Clear
Mostly Clear

Barometer Humidity/Dew Point Moon
Current: 29.854 inHg Falling 0.02 °F/hr
1-Hr Trend: Falling slowly
3-Hr Trend: Falling
High: 29.902  |  Low: 29.802
Humidity: 48 % Decreased 3% since last hour.
Humidex: 121.0°F
Dewpoint: 76.3°F Increased 0.7°F since last hour.
Wetbulb: 82.9°F
Waxing Crescent
Waxing Crescent, Moon at 1 days in cycle
3%
Illuminated
Current UV Index Current Solar Energy
   4.4    Medium 
High: 4.6 @ 1:00pm
Time to Burn: 25 Mins
Energy: 0 W/m2 (85%)
High: 750 at  1:27pm
Apparent Temp: 121.7°F
Heat Index Cooling Degree Days Sun
Current: 114.8°F
Today: 115.0°F  1:49pm
Yesterday: 112.5°F
Last Week: 114.8°F
Record: 127.2°F   26-Aug-2023
Today: 8.3
September: 263.7
2026 to Date: 2955.4
Heating Degree Days
2026 to Date: 930.5
Sunlight Hours
Possible hours of Daylight
12:30 hrs:min
-00:02:00 Min
Almanac Irrigation Index5 Station All Time Records Fire Risk
Sunrise: 7:08am
Sunset: 7:38pm
Moonrise: 8:37am
Moonset: 7:48pm
Full Moon: September 26 2026
New Moon: 15:51 UTC October 10 2026
Updated at Midnight
Current: 0.23 in   
7-Days Rain: 0.00 in   
7-Days ET: 1.66 in   
7-Day: -1.66 in 1.66 in water in deficit of what evaporated in last 7 days.
September: -2.59 in 2.59 in water in deficit of what evaporated this month.
Irrigation System: Standby
Other Conditions
Air Density: 1.12 kg/m3
Cloud Height: 6058 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:
25.3 at 1:50 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 102 °F
NWS forecast: Sunny, with a high near 102. Heat index values as high as 110. South wind 5 to 10 mph.
Tonight

Tonight: Mostly Clear
Mostly Clear

Lo 81 °F
NWS forecast: Mostly clear. Low around 81, with temperatures rising to around 83 overnight. Heat index values as high as 107. South southeast wind 5 to 10 mph.
 NWS NWS Short Term Weather Forecast
Tonight

Tonight: Mostly Clear
Mostly Clear
Sunday

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

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

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

Wednesday: Sunny
Sunny
Lo 81 °F Hi 101 °F Lo 81 °F Hi 100 °F Lo 80 °F Hi 99 °F Lo 79 °F Hi 99 °F
US Radar & Infrared Satellite
US Radar National Infrared Satellite
Radar/Satellite images courtesy of Weather Underground.