Jessica Lerner

Year-to-date volume stands at $310.166 billion, up 17.4% from $264.151 billion at the same time last year, prompting several firms to revisit their supply projections for the year.

Longer-term munis have become more attractive, said Cooper Howard, a fixed income strategist at Charles Schwab.

There is a buyer base that is a little bit "skeptical" of longer maturities, but it's more of a retail response, said Adam Congdon, a director at Payden & Rygel.

The primary market saw "decent subscriptions" last week, but the entire primary calendar came at "healthy concessions to where evals had been marked on existing bonds," Birch Creek strategists said.

Munis are "under pressure as elevated primary supply collides with lackluster seasonal reinvestment flows, leaving dealers heavy and buyers selective," said James Pruskowski, an investor and market strategist.

As the market continues to contend with the surge in issuance, investors still have a significant amount of cash that can be put to work, said Jeremy Holtz, a portfolio manager at Income Research + Management.

As always, economists had disparate interpretations of the consumer price index, with none expecting a July rate cut. And tariff questions remain unanswered.

Prices for some bonds issued for Florida's express train have fallen sharply since Friday.

"The muni market seemed to ignore Treasuries [last] week, marching to its own beat," said Birch Creek strategists.

The market has seen some "weirdness" in the muni curve, said Craig Brandon, co-head of muni investments at Morgan Stanley Investment Management.