"Hope you all will join me for a special day," the son and brother of two US presidents posted on Twitter, with a graphic showing the date 6.15.15.
Bush, 62, makes his much-anticipated announcement at Miami Dade College's Kendall campus, following a trip next week to Germany, Poland and Estonia.
The former two-term Florida governor, who has amassed a substantial war chest in the months since announcing his interest in following father George H W Bush and brother George W Bush into the White House, would enter an increasingly crowded GOP field.
There are some 16 possible major Republican candidates in all, but about five are bunched at the top of polls with 10 percent support each, including Bush, according to the Quinnipiac University Polling Institute.
Hillary Clinton is the early frontrunner in the Democratic field with no current close competition.
Bush's entry would immediately place him in the top tier, even though he has experienced difficulty wooing evangelical voters who are important in the early primary contests, and has struggled to answer questions over how his policies would differ from his brother's, notably on the Iraq war.
The website touted the number of jobs created and times taxes were cut during Perry's time in office in Texas. He plans a speech later today at a small airport as part of his campaign rollout.
Perry, who was the longest serving governor in Texas history, had a failed, gaffe-ridden presidential bid in 2012.
