The last time DCA had a high temp below 90° was 8 days ago.
Last Wednesday (7/17) was the hottest day so far this year at DCA with a high of 97°, and the coolest high in 7 days was 93°. It's July in D.C., so it's supposed to be hot as the average high at DCA stands at 89°, and that's close to where we'll be today and Tuesday. However, it looks like cooler temperatures and a break from the humidity is on the way.
This time of year in Washington, any big break from the heat and humidity is usually brief, and this next break should follow that convention. Also, I want to point out that I chat about this comfortable shift in our weather with a degree of skepticism because experience shows that July cold fronts often stall overhead or before they even make it to D.C. proving model guidance wrong.
Though as it stands now, a cold front should travel here from the Upper Midwest and pass through Washington on Wednesday, so the effects will mostly be felt by Thursday and Friday. Highs in the mid 80s are expected for Thursday and Friday, but even lower 80s are a possibility on Thursday. Dewpoints should also drop from the muggy lower 70s into the comfortable 50s/near 60°.
- Cooler & less humid air on the way