The Northam campaign announced Wednesday that the lieutenant governor and Obama will appear together at an event in Richmond on October 19.
"At the rally, Ralph and President Obama will discuss the need for the next governor to create economic opportunity for all Virginians - no matter who you are or where you're from", the statement added.
Obama has largely stayed out of the political spotlight since leaving office in January.
The former president won Virginia both in 2008 and 2012. Northam, a Democrat and now Virginia's lieutenant governor, is opposed by Ed Gillespie, a Republican who now works as a lobbyist.
Bush supported his former White House counselor for governor at two fundraisers in Richmond and Alexandria, and donated $25,000 to his campaign in April, before Gillespie had clinched the nomination.
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Trump endorsed Gillespie in a tweet on October 5.
That same day, Vice President Mike Pence will be appearing with Republican nominee Ed Gillespie at a campaign event in Abingdon, in Southwest Virginia. Northam attended a fundraising event last week in NY with former Secretary of State Hillary Clinton, and late last week President Donald Trump tweeted his first direct endorsement of Gillespie.
When asked if he's happy with the Trump endorsement, Gillespie said, "I appreciate the president endorsing me".
Gillespie has also turned to Bush to help fundraise and Northam recently had a fundraiser with Hillary Clinton.
Both sides are ramping up their efforts as the November 7 election day approaches.