8:25 p.m. update: It’s likely we’ve established at least two additional records today at Reagan National. 1) Highest low temperature for the date of 82, two above the old record of 80 from 2010 (assuming it doesn’t drop below that before midnight). 2) Highest average temperature for any calendar day on record (all-time) of 94.
At the moment, it appears the storms in Pennsylvania will remain to our northeast, but we’ll keep an eye on them.
5:40 p.m. update: The weather observer at National Airport reports the temperature did hit 106 for one minute. That would have tied D.C.’s all-time high, but it has to last for at least three minutes to count. So today’s official high will go down as 105, breaking the previous July 7 record of 102 in 2010. Also, Dulles tied its record high for the date with a high of 101, while BWI broke its record high for the date with a high of 103. Hope you managed to stay somewhat cool today. Again, we’ll keep an eye on those storms that could affect parts of the area this evening (see previous update below).
5:15 p.m. update: The National Airport temperature continued to be a sizzling 105 at 5 p.m., but the weather observer there reports the temperature has dropped to 104 since the top of the hour. So tying the all-time record of 106 looks unlikely, especially since it would have to be 106 for three consecutive minutes to be official (according to the observer). Also, we should note that a line of severe storms in central Pennsylvania could affect mainly the north/northeast suburbs around 7-10 p.m., though the line may weaken as it gets close. Best chance for seeing storms is toward Baltimore, but we’ll keep an eye on this.
4:18 p.m. update: National Airport has reached 105F as of 4:08 p.m. That is just the fifth time on record that the high temperature in D.C. has climbed to 105 or higher. Only one more degree to match the city’s all-time high of 106. Meanwhile, BWI is reporting 102 degrees, which breaks the record high for the date (101 in 2010).
4 p.m. update: Another hour and another report of 103F at National Airport, still 1 degree below the high of 104 so far, and 3 degrees shy of the all-time record of 106. Thankfully the dew point is only 60, which equates to a heat index of 104. Dulles has reached at least 100 so far, which is 1 degree short of the record for the date. CWG’s Ian Livingston reports this is the 12th day on record that D.C. has reached 104 or higher.
3 p.m. update: A thin veil of clouds - doing pretty much nothing to make the heat feel more tolerable if you’re outside - has kept the D.C. temperature from rising any higher than 104 so far. The 3 p.m. reading is still 103, steady from 2 p.m., but a dry-ish breeze from the west has dropped humidity across the area a bit. So heat index of 106 not as bad as it could be. Overall it’s still a dangerous strain of heat. BWI remains at 101 (tying the record high for the date) and Dulles at 98 (record for date is also 101).
1:45 p.m. update: Reagan National has now hit 104. That breaks the record for the day by 2 degrees and matches the highest temperature we’ve seen this summer (the high reached 104 on June 29). Getting closer to the all-time record of 106.
1 p.m. update: D.C. has at least tied the record for the date with a 1 p.m. reading of 102. Temperatures around the area are in the upper 90s to low 100s, and Baltimore (BWI) has also tied a record high with 101 at this hour. Temperatures could continue to climb for at least another few hours. With the sun angle and temperatures high, now might be a good time to spend indoors.
From 11:59 a.m: According to observers, at 11:35 a.m., Reagan National Airport hit 101 degrees. This may be a new record for the earliest in the day we’ve topped 100. This is Washington’s first stretch of three days of 100 degrees or higher since July 8-10, 1993, when it hit 100 on the nose three days in a row. It’s also only the fifth time on record we’ve seen a stretch like this. The record is four days in a row 100+, set in 1930.
The noon temperature at National was 100 degrees with a dew point of 70, yielding a heat index of 108. The daily record of 102 set in 2010 is likely to be broken shortly.
Today also marks the 10th straight day that Washington’s high has reached 95 degrees or higher. The longest such streak before this one was eight days.
The all-time highest D.C. temperature is 106 (August 6, 1930 and July 20, 1918). The second-highest is 105 (August 17, 1997 and July 10, 1936).
We’ll update this post as the temperature continues to climb. Also, check out the forecast into a cooler next week.