Heat Advisory HEAT ADVISORY - Plano, Collin County, Texas
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Updated: @ 08-Sep-2026 1:40pm - next update at 1:45pm  
Summary / Temperature Wind Precipitation Outlook


Partly cloudy, Dry
Partly cloudy, Dry

98.5°F Warmer 1.3°F than last hour.
Dangerously Hot
Currently 98.5, Max: 99.6, Min: 80.6 Feels like:
109°F

24-hr
difference
-0.8°FColder 0.8°F than yesterday at this time.
TEMP HIGH LOW
Today 99.6°F
1:11pm
80.6°F
7:11am
Yesterday 101.6°F
3:37pm
78.9°F
6:30am
Record 110°F
2023
55°F
1898
Normal 91°F
71°F
 Wind from SSE SSE
4.2
Gust:
5.5
Light Breeze

60-Min Avg: 5.8 mph
120-Min Avg: 4.6 mph
Max Gust: 17.6 mph 1:02pm
Month: 23.1 mph Sep 3
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
35 days since last rain
Tonight

Tonight: Mostly Clear
Mostly Clear

Barometer Humidity/Dew Point Moon
Current: 29.986 inHg Falling 0.02 °F/hr
1-Hr Trend: Steady
3-Hr Trend: Falling
High: 30.030  |  Low: 29.911
Humidity: 43 % Decreased 2% since last hour.
Humidex: 115.8°F
Dewpoint: 72.1°F Decreased 0.2°F since last hour.
Wetbulb: 80.1°F
Waning Crescent
Waning Crescent, Moon at 27 days in cycle
7%
Illuminated
Current UV Index Current Solar Energy
   2.2    Low 
High: 4.7 @ 1:00pm
Time to Burn: 51 Mins
Energy: 0 W/m2 (16%)
High: 814 at  1:00pm
Apparent Temp: 111.1°F
Heat Index Cooling Degree Days Sun
Current: 109.2°F
Today: 110.8°F  1:35pm
Yesterday: 111.7°F
Last Week: 111.6°F
Record: 127.2°F   26-Aug-2023
Today: 11.8
September: 172.9
2026 to Date: 2864.3
Heating Degree Days
2026 to Date: 930.5
Sunlight Hours
Possible hours of Daylight
12:37 hrs:min
-00:01:59 Min
Almanac Irrigation Index5 Station All Time Records Fire Risk
Sunrise: 7:06am
Sunset: 7:43pm
Moonrise: 4:13am
Moonset: 6:15pm
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: 1.59 in   
7-Day: -1.59 in 1.59 in water in deficit of what evaporated in last 7 days.
September: -1.59 in 1.59 in water in deficit of what evaporated this month.
Irrigation System: Ready
Other Conditions
Air Density: 1.13 kg/m3
Cloud Height: 6788 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:19 ISS:Ok CON:4.6 RCP:98%
Chandler Burning Index
Chandler Burning Index: LOW
Currently:
33.1 at 1:40 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: Mostly Sunny
Mostly Sunny

Hi 101 °F
NWS forecast: Mostly sunny, with a high near 101. Heat index values as high as 106. South southeast wind around 10 mph.
Tonight

Tonight: Mostly Clear
Mostly Clear

Lo 80 °F
NWS forecast: Mostly clear. Low around 80, with temperatures rising to around 82 overnight. Heat index values as high as 104. South southeast wind 5 to 10 mph.
 NWS NWS Short Term Weather Forecast
Tonight

Tonight: Mostly Clear
Mostly Clear
Wednesday

Wednesday: Sunny
Sunny
Wednesday
Night
Wednesday Night: Mostly Clear
Mostly Clear
Thursday

Thursday: Mostly Sunny
Mostly Sunny
Thursday
Night
Thursday Night: Partly Cloudy
Partly Cloudy
Friday

Friday: Mostly Sunny
Mostly Sunny
Friday
Night
Friday Night: Mostly Clear
Mostly Clear
Saturday

Saturday: Sunny
Sunny
Lo 80 °F Hi 100 °F Lo 79 °F Hi 99 °F Lo 78 °F Hi 98 °F Lo 79 °F Hi 99 °F
US Radar & Infrared Satellite
US Radar National Infrared Satellite
Radar/Satellite images courtesy of Weather Underground.