United State Weather Bureau forecasters at Logan Airport were not interested in Tom Collinses or $20 fines. Coldly statistical, the Bureau said that its thermometer hit 85 degree yesterday at 3:30 p.m. and humidity was up to a moist 61 percent. Record temperature for the same day was 100 degrees in 1925.

Sunday the high was 87 degree, and Saturday temperatures reached 85. Record mark for the season is 90 degrees, set on May 19.

Temperatures should drop about 15 degrees today, the Bureau forecast last night, but weather will continue fair.

Undercover Agents

Whether weather stays hot or cold, bathers had better keep, covered while in transit to the beaches, the MDC told the Boston press Sunday. In a ruling full of technicalities and escape clauses, the MDC ordered:

Women may wear French bathing suits at the beaches, but these garments must cover "the essentials."

Men can wear trunks without tops at the beach. Theoretically, they must cover their chests while walking to the beach, but MDC will not enforce this rule unless bathers are so robust that ungainly folds o flab distort the midriff