It was back to summerlike Thursday — maybe late summer, with the lowish humidity — in this persistently toasty week. Highs were around 90 for the second time, with some locations picking up their first 90-degree day of the year. Those spots include the District, where it reached 91, tying a record for the date. Dulles Airport set its third record high of the week, reaching 91. Baltimore also tied a record with a high of 90. Modified air off the Atlantic Ocean should send temperatures downward for Friday, but it will still be warm.