Weather in St. Petersburg
St. Petersburg's climat is rainy and sometimes cold
Summer temperature is approximately: 18~25 C
Winter temperature: -5 ~ -25 C
The longest seasons are spring and autumn (from march to june and from august to december)
Autumn temperature: 6~15 C
Links to forekast services:
Intermeteo.com - weather forecast for 5, 10 or 15 days
Weatherpost - 5 day forecast.
Gismeteo, NPO MapMakers (in Russian)