Warming seen in Russia is a real danger to health of population. The authors consider influence of warming on prevalence of some infectious and parasitic diseases. At present, the most reliable proof are obtained for West Nile fever and Crimean fever. To obtain reliable data on other infectious diseases we need prolonged followup in inpatient departments. Abnormally high temperatures in cities result in higher mortality rate withcardiovascular diseases including myocardial infarction, increased drowning and suicides numbers.