Most save the date cards will not require more than a typical forever stamp (first class) when you are mailing with the US postal service, because they are usually fairly small (5x3.5 inches, 5.5x4.25 inches) and will weigh under an ounce.
Day by Day weather log for Barcelona Weather in September. September 30. Daily Comment: Temperature 25Â° C around 77 F Warm and sunny light cloud at times but generally clear skies. Day 29. Daily Comment: Temperature 25Â° C around 77 F warm and sunny. A little light cloud at times from 15:00 onwards.
Averages for Barcelona in September. After August the weather cools down considerably and some of the best Barcelonan weather conditions can be experienced in the months of September, October and November. If the sweltering and humid conditions of August are too much for you, a visit in September could be more suited to you.