Temperatures in P-Town, the National Weather Service said, will peak around 58 degrees.
But Boston is expected to reach 84 degrees, easily besting the historic high for April 11 that was set in 1995 when the thermometer hit 55 degrees.
“Record warmth in many locations away from the south coast, Cape and Islands this afternoon,’’ forecasters wrote. “Expect lots of sunshine today…”
Winds will be noticeable with gusts hitting some 23 miles an hour, especially later in Tuesday, in Greater Boston, forecasters wrote.
Yet, just days after forecasters warmed of flooding in some riverside communities as a result of heavy rains, the weather service issued a “hazardous weather outlook’’ for all of Massachusetts (except Berkshire County).
“Fire weather officials have advised of an elevated fire spread potential again later this morning and afternoon,’’ forecasters wrote. “Officials are mainly concerned with the top-layer fine fuels especially on any south facing slopes.’’
Overnight temperatures will drop back into the 50s in Greater Boston.
It will be cooler on Wednesday with temperatures only in the 60s amid a 50 percent chance for rain, forecasters wrote.