They join England's Danny
Willett and American Patrick Rodgers in earning the status for success during
the campaign.
Grace and Smith shared
fourth at the US Open at Chambers Bay two weeks ago while Lowry finished ninth.
The results boosted all three above the season points total for the 150th best
player from last season.
As a result of their new
status, Grace, Lowry and Smith are able to accept an unlimited number of
sponsor exemptions for the remaining tournaments of the season as they try to
win enough money to secure playing rights for next season.
While they remain
ineligible for the US PGA season-ending playoffs that begin in August, those
with special temporary member status would claim a tour spot and playoff
eligibility by winning a tour event.
Grace, 27, has won six times on the European Tour, most recently at the Qatar Masters in January. Lowry, 28, has two European Tour wins, the 2012 Portugal Masters and 2009 Irish Open as an amateur. Smith, a 21-year-old from Brisbane, won the 2013 Australian Amateur crown and spent 2014 on the Asian Tour with a runner-up showing at the Indonesian Masters.