It will dry out for Tuesday along with temps in the 80's. Then the heat and humidity will return along daily chances for showers and storms.
Boston forecast:
Tonight: Clearing with a low of 60.
Tuesday; Mostly sunny with a high of 85. SW wind of 10-20 MPH.
Tuesday night: Clear with lows in the mid 60's.
Wednesday; Partly sunny with scattered showers and thunderstorms. Highs in the upper 80's .
Thursday; Partly sunny with a passing shower or t-storm. Highs in the low 90's.
Friday; Sunny with highs in the 90's.
Saturday; Sunny with highs in the 90's.
Sunday; Sunny with highs in the 80's.