This paper presents a study of rain-induced vibration on a plate structure using operational modal analysis. Operational modal analysis is a technique for modal identification that could perform cost-effective and quick testing based solely on the responses of the structure that are subjected to ambient or natural excitation such as wind, traffic, or microtremors without affecting its operating conditions. However, there is a limitation to the study on rain-induced vibration for operational modal analysis. During rainy days, the dynamic test is often delayed because it is thought to interact with the recorded data resulting in data corruption. The dynamic tests are typically postponed to another day, particularly on a sunny day. The objective of this research is to analyze the feasibility of rain-induced vibration as an input excitation for operational modal analysis. The experimental verification of a plate structure is performed on rainy day and compared to the results of random excitation by hand tapping in the lab. The suitable random loads must comply with two primary operational testing rules: they must have various input loads and collect high-quality operating response data. The results are compared by employing a singular value decomposition of the observed data’s spectral matrix, mode shape comparison, data validation by comparing the modal assurance criterion (MAC) between FFD and SSI-UPC analysis during the first mode, and modal parameter estimation. The overall findings were satisfactory, as the first mode provides an equivalent value of natural frequency with 0.32% error between both types of excitations, hand-tapping and rain-induced vibration. Eventually, rain-induced vibration can be used as an input excitation for operational modal analysis. This enables tropical climate countries, like Malaysia, to conduct dynamic structural testing even on rainy days. It would not affect the results data or findings.