Olya, how can you really make a matching weather forecast for this period?It is only approximate, and it is sold about 60 percent at the most.
Indian summer usually comes to us September 11-12, but this year is forecast very warm late August and early September are hot, but just 11-12 September will be the cold weather with heavy rains of autumn.
Relatively warm and sunny would be only 17 of September. Then comes the first Indian summer.
Weather forecast for the first half of September in the web.Here this link but I did not really trust him.
25 December 2016