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.
The average maximum temperature in Madrid in August is 90Â°F/32Â°C and the average minimum temperature is 61Â°F/16Â°C. Weather in Barcelona in August Barcelona doesn't get quite as hot as Madrid in August, but there is a similar exodus of locals at this time of year.