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Squeaky P says
Seems the other posters didn't catch the part about river cruising. You won't find many if any cruises going after the 1st week of september. Also, it can be quite chilly after August. I spent a week in both cities for the past 2 septembers and I saw the sun about 10% of the time and the temp was from 30 to 55 deg. F with a strong breeze and some frost (although that was unusual they told me).
Try to go at the beginning of September if you are doing a river cruise.
Kseniya says
I would say, that the best autumn time in SPb is between the end of September and the begining of October. Trees are already golden and red, but it's not too cold and weather is usually fine.