This book focuses on the time series forecasting of critical meteorological parameters including temperature rainfall humidity and wind. It explores classical statistical models such as ARIMA Holt-Winters and Exponential Smoothing along with a novel enhancement-the Modified Sliding Window Algorithm. The objective is to improve prediction accuracy in meteorological datasets by applying adaptive techniques. Real-time weather data has been analyzed using these models and a comparative study highlights the performance of each. This work is beneficial for researchers meteorologists and data scientists working in climate modeling and weather prediction.