Thursday, July 2
The second day of this extreme heat wave saw temperatures reach 102 at Reagan National, 98 at Dulles Airport, and 101 at BWI Marshall.
It was a new record high for DC, as measured at National, surpassing 101 in 1898, and becoming the eighth record high this year. The 98 at Dulles tied a record for the date there.
Heat indexes were a touch hotter than Wednesday, reaching at least 111 in DC, 109 at Dulles, and 110 at BWI.
DC's low of 80 Thursday morning will also be a record for the date.
Wednesday, July 1
Day one of the heat wave on Wednesday saw highs reach 98 at Reagan National Airport and 97 at Dulles and BWI airports. Andrews Air Force Base in Camp Springs, Md., reached 99 degrees.
The high of 97 at Dulles was a record for the date, beating 96 in 2012.
Peak heat indexes of 105 to 110 were common across the area, including 110 in DC, thanks to extremely humid dew points in the mid-70s.
College Park, Md., recorded a scorching heat index of 114 according the Maryland Mesonet.
A bit of an overperformance in the heat and humidity today. Several mesonet sites crept into the upper 90s. The 114° peak heat index at the College Park location appears to be a network record. #MdWx pic.twitter.com/EmADZveXEz
— Matt Miziorko (@SnarkyEM) July 1, 2026
