It is supposed to be HOT this weekend. From the National Weather Service:

…HEAT ADVISORY REMAINS IN EFFECT FROM NOON TODAY TO 8 PM EDT THIS EVENING… …EXCESSIVE HEAT WATCH REMAINS IN EFFECT FROM SUNDAY AFTERNOON THROUGH MONDAY AFTERNOON…
…
A HEAT ADVISORY REMAINS IN EFFECT FROM NOON TODAY TO 8 PM EDT THIS EVENING. AN EXCESSIVE HEAT WATCH REMAINS IN EFFECT FROM SUNDAY AFTERNOON THROUGH MONDAY AFTERNOON.
…
A BERMUDA HIGH OVER THE WESTERN ATLANTIC THROUGH MONDAY WILL BRING HOT AND HUMID CONDITIONS TO THE REGION ON WEST TO SOUTHWEST WINDS. HIGH TEMPERATURES ACROSS MOST OF NORTHERN AND CENTRAL VIRGINIA AS WELL AS THE BALTIMORE AND WASHINGTON METROPOLITAN AREAS WILL REACH THE MID AND UPPER 90S EACH DAY. A FEW LOCATIONS MAY REACH 100 DEGREES.
…
THE HOT TEMPERATURES COMBINED WITH HIGH HUMIDITY WILL CAUSE HEAT INDICES TO APPROACH 105 DEGREES THIS AFTERNOON. HEAT INDICES MAY APPROACH 110 DEGREES SUNDAY AND MONDAY.