The North African state, which has seen an exodus of tourists, has admitted that its security services were unprepared for the seaside attack in Port El Kantaoui and that police were too slow to respond.
"The president has declared a state of emergency in Tunisia and will address the nation at 5 pm (1600 GMT)," Essebsi's office said, adding that it would be implemented for a renewable 30-day period.
A state of emergency, granting special powers to the police and army, was in force for two years up until March 2014, following longtime secular president Zine El Abidine Ben Ali's ouster in a 2011 revolution.
Independent political analyst Selim Kharrat questioned the timing of Essebsi's announcement, eight days after the beach attack, and warned that a state of emergency "could become an excellent tool of repression".
Tunisia has faced a post-revolution surge in jihadist violence in which dozens of police and soldiers have been killed.
The June 26 beach shooting was the second such rampage in three months, after another jihadist attack at the National Bardo Museum in Tunis on March 18 that killed 21 tourists and a policeman.
Yesterday, Prime Minister Habib Essid acknowledged that police had taken too long to respond to the attack in Port El Kantaoui near Sousse.
"The time of the reaction -- this is the problem," Essid told the BBC in an interview. Police had been "blocked everywhere", he added.
Essid spoke as Britain's Queen Elizabeth II and Prime Minister David Cameron led a minute's silence for the victims, 30 of whom were British.
Three Irish nationals, two Germans, one Belgian, one Portuguese and a Russian were also killed.
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