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 Details for Jacksonville Heat Advisory  +1 additional alert

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Heat Advisory HEAT ADVISORY - Jacksonville

NWS Southeast Regional Radar WU South East Satellite
Radar/Satellite images courtesy of NOAA/NWS and Weather Underground.
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Updated: @ 21-Aug-2026 11:47am  
Summary / Temperature Wind Rain Outlook
Clear Clear
Currently: 90.7, Max: 90.7, Min: 74.7 90.7°F
Warmer 4.0°F than last hour.

Extremely Hot

Feels like: 113°F

24-hr difference
30°FWarmer 30.0°F than yesterday at this time.
  Today Yesterday
High: 90.7°F
11:47am 		97°F
3:14pm
Low: 74.7°F
4:03am 		76.8°F
6:55pm
Wind from WNW WNW
1.8
Gust:
 4.9 mph
1 Bft - Light air
Today: 7.6 mph 12:34am
Gust Month: 30.2 mph August 14
Rain Today: 0 in
Rain Rate (/hr): 0 in
Rain Yesterday: 0.14 in
This Month: 6.22 in
Season Total: 21.37 in
Tonight

Tonight: Chance Showers And Thunderstorms
Chance Showers And T-Storms
Humidity & Barometer Almanac Moon
Humidity: 65 % Decreased 7.0% since last hour.
Dew Point: 77.4°F Increased 0.8°F since last hour.
Barometer: 30 inHg Rising 0.16 inHg/hr
Baro Trend: Rising Rapidly
Sunrise: 6:56am
Sunset: 8:01pm
Moonset: 12:48am
Moonrise: 3:42pm
Waxing Gibbous
Waxing Gibbous, Moon at 8 days in cycle
65%
Illuminated
UV Index Solar Radiation
   5.4     Medium 
High: 11.6 @ 11:44am
506 W/m2 (49 %)
High: 1091 @  11:44am
 NWS Weather Forecast  - Outlook: Today & Tonight
Today

Today: Partly Sunny then Slight Chance Showers And Thunderstorms
Partly Sunny then Slight Chance Showers And T-Storms

Hi 94 °F		 NWS forecast: A slight chance of showers and thunderstorms between 1pm and 3pm, then a chance of showers and thunderstorms. Partly sunny. High near 94, with temperatures falling to around 90 in the afternoon. Heat index values as high as 105. South wind 5 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch possible.
 
Tonight

Tonight: Chance Showers And Thunderstorms
Chance Showers And T-Storms

Lo 76 °F		 NWS forecast: A chance of showers and thunderstorms before 9pm, then a chance of showers and thunderstorms between 9pm and 10pm, then a slight chance of showers and thunderstorms between 10pm and 1am. Mostly cloudy, with a low around 76. South wind 6 to 12 mph, with gusts as high as 17 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.