It is usually more expensive to deliver the electricity at the fringe of a grid due to higher costs of energy delivery and transmission losses. Solar photovoltaic (PV) generation has the potential to provide energy to fringe areas. However, with more PV systems being integrated into distribution networks, it raises a set of new challenges to comply with the grid regulations, especially for the fringe and weak distribution system. To better address these issues, it is vital for network operators to know PV plant variabilities. In this paper, variability study is carried out based on the operational data from a 3.275 MWp PV plant in the fringe of the grid. This paper provides a comprehensive investigation on variability analysis of irradiance and PV generation. The results will provide useful information for a better understanding on the plant performance and operational challenges caused by its impact to the integrated distribution network.