  This paper reports results from our long-term $BV(RI)_{c}$ photometric CCD
observations of eight pre-main-sequence stars collected from June 2008 to
October 2022. These stars are located in the young open cluster Trumpler 37, in
the field of GM Cephei. The observational data indicate that all stars from our
study exhibit variability in all-optical passbands, typical for young stars. In
this paper, we describe and discuss the photometric behavior of the stars and
the possible reasons for their variability. For two of the objects, we
identified periodicity in their light variation.
