All major credit cards are accepted in most hotels and restaurants. Banks are closed on Saturdays. On Sundays banks and shops are closed. In September temperatures are typically rising up to 20-25 C during the day and falling down to about 10 C during the night. Annual variations are quite pronounced.
Warmer clothing is advisable for evening outdoor wear and for trips to the mountains.
Normally September is a period of mainly sunny weather. However, the possibility of rainy weather can not be excluded.