Heat Advisory HEAT ADVISORY - Plano, Collin County, Texas
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Updated: @ 16-Sep-2026 2:40am - next update at 2:45am  
Summary / Temperature Wind Precipitation Outlook


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

84.3°F Colder 1.1°F than last hour.
Warm
Currently 84.3, Max: 87.5, Min: 84.3 Feels like:
91°F

24-hr
difference
-0.6°FColder 0.6°F than yesterday at this time.
TEMP HIGH LOW
Today 87.5°F
12:00am
84.3°F
2:32am
Yesterday 101.0°F
3:16pm
80.0°F
7:25am
Record 102°F
1900
50°F
1903
Normal 89°F
69°F
 Wind from S S
9.0
Gust:
7.7
Gentle Breeze

60-Min Avg: 8.1 mph
120-Min Avg: 6.9 mph
Max Gust: 17.6 mph 12:06am
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
43 days since last rain
Wednesday

Wednesday: Sunny
Sunny

Barometer Humidity/Dew Point Moon
Current: 30.041 inHg  
1-Hr Trend: Steady
3-Hr Trend: Rising slowly
High: 30.045  |  Low: 30.022
Humidity: 69 % Increased 3% since last hour.
Humidex: 102.4°F
Dewpoint: 73.0°F Increased 0.3°F since last hour.
Wetbulb: 76.5°F
Waxing Crescent
Waxing Crescent, Moon at 5 days in cycle
27%
Illuminated
UV Forecast Current Solar Energy
16-Sep-2026   Very High   8.0   
17-Sep-2026   High   7.7   
18-Sep-2026   High   7.9   
Energy: 0 W/m2 (0%)
High: 0 at  12:00am
Apparent Temp: 86.8°F
Heat Index Cooling Degree Days Sun
Current: 91.0°F
Today: 95.0°F  12:00am
Yesterday: 111.0°F
Last Week: 116.5°F
Record: 127.2°F   26-Aug-2023
Today: 2.2
September: 355.9
2026 to Date: 3047.8
Heating Degree Days
2026 to Date: 930.5
Sunlight Hours
Possible hours of Daylight
12:22 hrs:min
-00:02:00 Min
Almanac Irrigation Index5 Station All Time Records Fire Risk
Sunrise: 7:11am
Sunset: 7:33pm
Moonrise: 12:44pm
Moonset: 9:52pm
Full Moon: September 26 2026
New Moon: 15:51 UTC October 10 2026
Updated at Midnight
Current: 0.12 in   
7-Days Rain: 0.00 in   
7-Days ET: 1.81 in   
7-Day: -1.81 in 1.81 in water in deficit of what evaporated in last 7 days.
September: -3.67 in 3.67 in water in deficit of what evaporated this month.
Irrigation System: Standby
Other Conditions
Air Density: 1.16 kg/m3
Cloud Height: 3337 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:
5.5 at 02:40 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 Wednesday's Outlook
Overnight

Overnight: Clear
Clear

Lo 81 °F
NWS forecast: Clear, with a low around 81. South wind 5 to 10 mph.
Wednesday

Wednesday: Sunny
Sunny

Hi 99 °F
NWS forecast: Sunny, with a high near 99. Heat index values as high as 104. South wind 5 to 10 mph.
 NWS NWS Short Term Weather Forecast
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: Sunny
Sunny
Friday
Night
Friday Night: Mostly Clear
Mostly Clear
Saturday

Saturday: Sunny
Sunny
Saturday
Night
Saturday Night: Mostly Clear
Mostly Clear
Hi 99 °F Lo 80 °F Hi 99 °F Lo 79 °F Hi 99 °F Lo 77 °F Hi 99 °F Lo 77 °F
US Radar & Infrared Satellite
US Radar National Infrared Satellite
Radar/Satellite images courtesy of Weather Underground.