Heat Advisory HEAT ADVISORY - Plano, Collin County, Texas
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Updated: @ 10-Aug-2026 9:45pm - next update at 9:50pm  
Summary / Temperature Wind Precipitation Outlook


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

90.5°F Colder 1.7°F than last hour.
Hot
Currently 90.5, Max: 99.9, Min: 77.5 Feels like:
96°F

24-hr
difference
3°FWarmer 3°F than yesterday at this time.
TEMP HIGH LOW
Today 99.9°F
4:29pm
77.5°F
6:38am
Yesterday 99.8°F
2:24pm
76.9°F
6:58am
Record 110°F
1936
63°F
1989
Normal 97°F
77°F
 Wind from SSE SSE
6.3
Gust:
4.4
Light Breeze

60-Min Avg: 6.9 mph
120-Min Avg: 5.8 mph
Max Gust: 20.9 mph 4:20pm
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: 0.01 in
Rain Season:1 22.54 in
Rain Days: 58 in 2026
6 days since last rain
Tuesday

Tuesday: Sunny
Sunny

Barometer Humidity/Dew Point Moon
Current: 29.958 inHg Rising 0.02 °F/hr
1-Hr Trend: Rising slowly
3-Hr Trend: Steady
High: 30.036  |  Low: 29.929
Humidity: 51 % Increased 3% since last hour.
Humidex: 105.8°F
Dewpoint: 69.9°F Increased 0.3°F since last hour.
Wetbulb: 76.5°F
Waning Crescent
Waning Crescent, Moon at 27 days in cycle
4%
Illuminated
UV Forecast Current Solar Energy
10-Aug-2026   Very High   9.7   
11-Aug-2026   Very High   9.3   
12-Aug-2026   Very High   9.9   
Energy: 0 W/m2 (0%)
High: 858 at  1:59pm
Apparent Temp: 93.7°F
Heat Index Cooling Degree Days Sun
Current: 95.7°F
Today: 109.7°F  4:38pm
Yesterday: 112.1°F
Last Week: 111.2°F
Record: 127.2°F   26-Aug-2023
Today: 17.1
August: 228.7
2026 to Date: 2121.7
Heating Degree Days
2026 to Date: 930.5
Sunlight Hours
Possible hours of Daylight
13:30 hrs:min
-00:01:42 Min
Almanac Irrigation Index5 Station All Time Records Fire Risk
Sunrise: 6:47am
Sunset: 8:17pm
Moonrise: 5:18am
Moonset: 6:57pm
Full Moon: July 29 2026
New Moon: 17:37 UTC August 12 2026
Updated at Midnight
Current: 0.33 in   
7-Days Rain: 0.01 in   
7-Days ET: 2.09 in   
7-Day: -2.08 in 2.08 in water in deficit of what evaporated in last 7 days.
August: -2.66 in 2.66 in water in deficit of what evaporated this month.
Irrigation System: Standby
Other Conditions
Air Density: 1.15 kg/m3
Cloud Height: 5470 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 9:45 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 Tuesday's Outlook
Tonight

Tonight: Clear
Clear

Lo 79 °F
NWS forecast: Clear. Low around 79, with temperatures rising to around 81 overnight. Heat index values as high as 104. South wind 10 to 15 mph.
Tuesday

Tuesday: Sunny
Sunny

Hi 99 °F
NWS forecast: Sunny, with a high near 99. Heat index values as high as 108. South southwest wind around 10 mph, with gusts as high as 20 mph.
 NWS NWS Short Term Weather Forecast
Tuesday

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

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

Thursday: Sunny
Sunny
Thursday
Night
Thursday Night: Clear
Clear
Friday

Friday: Sunny
Sunny
Friday
Night
Friday Night: Clear
Clear
Hi 99 °F Lo 80 °F Hi 100 °F Lo 80 °F Hi 100 °F Lo 79 °F Hi 100 °F Lo 80 °F
US Radar & Infrared Satellite
US Radar National Infrared Satellite
Radar/Satellite images courtesy of Weather Underground.