We show that in all countries with more than 1000 monkeypox cases at the end of August 2022, the evolution of the total number of cases is described by the Gompertz growth model. Although the data collection has many temporal irregularities, we have been able to measure the order of magnitude of the number of new cases per day in each country until the end of the study period in August 2022, as well as to analyse its dynamics. In this way, it is easy to check whether the epidemiological situation is improving. If no new epidemic outbreaks appear, as of early September, the model predicts a rapid improvement in the epidemiological situation.