Get ready for some sizzle. The cold front that moved into the region last night will soon be only a memory, as dewpoints and temperatures rise today. The Fourth of July could be even hotter, kicking off a six-day heat wave, forecasters said.

Hazy sunshine, with highs in the upper 80s, is expected today, according to the National Weather Service.

“The Bermuda high is going to bring a warm, tropical air mass up here,” said meteorologist Bill Simpson.

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There is about a 20 percent chance of scattered showers and thunderstorms for the rest of the week, mostly west of Interstate 495. The quick, powerful storms could cause local flooding and whip up gusty winds that could knock over trees, according to the weather service. A flash flood watch has been issued for areas of Western and Central Massachusetts.

The weather will get hot on Independence Day, with temperatures rising to 90.

Boston’s highest temperature of the year, which stands at 95, could be broken by the weekend, with temperatures between 90 and 95 on Thursday and the heat continuing through the weekend, Simpson said.

The intense temperatures will be accompanied by high dewpoints, making it even more uncomfortable. A heat wave could persist for six days, although Boston could stay slightly cooler if a sea breeze graces the coast.

An official heat wave is defined as three days of temperatures of 90 or more.