A method for predicting an exhaust gas temperature. The method includes detecting a plurality of exhaust gas temperatures and applying a weight value to the detected plurality of exhaust gas temperatures to determine a plurality of weighted temperature values. The weight value applied to at least one detected exhaust gas temperature may be different than the weight value applied to at least one other detected exhaust gas temperature. The method also includes determining an estimated temperature corresponding to the plurality of weighted temperature values and the applied weight value. The estimated temperature may be used to determine a set-point for the storage or absorption of a reductant by a catalyst. Moreover, the estimated temperature may allow for an adjustment to the reductant being stored on the catalyst if the storage capacity of the catalyst may be changing based on a predicted change in exhaust gas temperature.