Current weather: Some clouds, no wind, no visibility restrictions, and not forecast to change today. Temps around 70*F.Tomorrow's forecast is the same but about 10*F warmer.
From Google
http://www.vesti.ru/doc.html?id=315329The launch of the Soyuz 2 rocket with Meteor-M and six smaller satellites was delayed due to meteorological conditions. The launch day is now September 16th.
Obviously bad weather can prevent a launch of Soyuz, too.