The best time for visit to St. Petersburg, Russia is during the white nights, in May-June. The white nights is the most romantic period, you can walk around the city till the midnight, take a night boat trip to enjoy the draw bridges and the beauties of the city. The weather is usually just fine in May-June. But, be ready to see the city very crowded as hundrends of tourists are coming during the white nights. Such popular spots like the Hermitage, Peterhof, Catherine's Palace are also overcrowded. The hotels are overbooked, so take care of your accommodation in advance.
July-August are also nice months for visiting St. Petersburg. There aren't so many tourists in the city, the weather is warm and sunny, teh hotels are not so expensive as during the white nights.
Autumn
The best time to come to the Nothern capital of Russia is the end of September - beginning of October. It is still warm and the trees are all yellow and red. It is the most beautiful time in St. Petersburg suburbs like Pushkin, Peterhof, Pavlovsk, Gatchina. The park in Pavlovsk is really marvelous, many locals go there to take some photos with the fallen yellow and red leaves. There aren't many tourists in the city in autumn and you can enjoy it in full.
Winter
Winter weather in St.Petersburg may be very unpredictable. One day it is about 0, and the next is minus 10-15. The days are short, the sun rises at about 10:00-10:30 and sets at 16:30-17:30 depending on month. Though St. Petersburg is still worth of visit. There's nothing more beautiful than a frozy winter morning, when the sun is shining and light up the golden dome of St. Isaac's Cathedral, the icy Neva river and the snowy Winter Palace. Or the winter evening when Spilt Blood Cathedral is illuminated when it's snowing. It is nice to walk around the city and enjoy its beauties and the to warm youself at one of the cafes with a hot spicy winter beverage. St. Petersburg is very beautiful during the New Year time. It is all decorated and illuminated, there are huge New Years trees at the Palace square and Gostinny Dvor, the annual Christmas fair takes place on Ostrovsky square. Don't doubt and come to St. Petersburg in winter!
