The Temple of the Grain Measurers (nr. 2 on the plan) is enclosed by the same Trajanic wall as the adjacent Hall of the Grain Measurers (I,XIX,1.3). It is the guild temple of the mensores frumentarii. It was built on a podium, the lower part of which is older than the Trajanic period. The present cella was built in the Trajanic period (opus latericium). The pronaos was reached from Via della Foce along five travertine treads. Its columns have disappeared.

The temple may have been dedicated to Ceres Augusta, because Cnaeus Sentius Felix is called patronus mensorum frumentariorum Cereris Augustae, "patron of the guild of the grain measurers of the August Ceres".