As residents revel in Boston’s suddenly warm temperatures, a weeklong festival of smooth jazz is making a move to keep the city cool.

Nonprofit advocacy group Jazz Boston organized a celebration of the genre, which features hundreds of artists performing in almost 100 different venues around the city, from April 21-29.

“[We’re] trying to stimulate a more lively jazz scene,” said Jazz Week co-chairman Mark Harvey. “We’re trying to reach anyone and everyone — all ages all across the spectrum that is Boston and the larger metro area.”

Harvey said he founded a similar organization in 1970 called Jazz Coalition, which orchestrated Boston’s first Jazz Week in 1973. Depleting funds and faltering interest caused the celebration to fall flat in 1983, however, and the coalition disbanded in 1990.

After almost 25 years, Harvey said he hopes Jazz Boston will revive the city’s interest in the music.

“We’re letting the public know of the wealth of jazz players in this town — the diversity of styles and types of venues and the breadth and depth of the entire scene,” he said.

Cole Ruwet, owner of Solstice Café, which held a Jazz Week performance last weekend, said the venue’s already-established weekly jams on Thursdays and Saturdays attracted a more diverse crowd this week.

“This is the first time in a long time that something like this has been organized in Boston,” he said, though he noted other cities such as Montreal hold large annual jazz festivals.

“This is a good first step,” he said. “There is a good scene.”

Performances will be held in large venues such as the Sheraton Boston Hotel and the Berklee Performance Center, as well as smaller, intimate settings like Wally’s Jazz Café on Massachusetts Avenue. The festival will reach as far out as Newton South High School and as far up as The Top of the Hub Restaurant and Bar on the Prudential Tower’s 52nd floor.

Titus Abbott, of The Titus Abbott Collective, which performed this week at The Lily Pad in Cambridge, said jazz is often relegated to a small sidebar in arts magazines in favor of other types of music that have larger mass appeal.

Abbott, whose band is based in New York City, said exposure to jazz is important because Bostonians would enjoy it “if they gave it more of a chance,” pointing to the accomplished jazz musicians at the Berklee College of Music and the New England Conservatory.

Composer, saxophonist and woodwind artist Pat Donaher said Boston’s intellectual atmosphere creates its own original style of jazz.

“The music itself — since this is an academic town — tends to be a little more intellectual than, say, Chicago or New Orleans,” he said.

“Jazz is important because it reminds us of our humanity,” he said. “Ideally, the music challenges us to feel, to react, to laugh, to cry.”