Autumn is a short season in St Petersburg and is definitely time to start wrapping up. After the festivals and celebrations of summer, autumn becomes slightly more focused as everyone prepares for the long winter. It's also the city's cultural season so there's much to experience.
Autumn is short season lasting only from September to November, though there are some weather changes it tends to stay very comfortable. For a lot of people, this is the most beautiful and pleasant time to visit Beijing.