The climate of Sofia is continental with cold winters and warm summers. The average minimum temperature in Sofia in June is 12.0°C (73.4°F). The average maximum temperature is around 23.0°C (73.4°F).
Forecast can be found here and here
Bulgarian lev (pl. leva). Coins with smaller denomination are called "stotinki" (100 stotinki = 1 lev). There are banknotes of 5, 10, 20, 50, 100 leva and coins of 1, 2 leva and 1, 2, 5, 10, 20, 50 stotinki.
See: Notes in Circulation Coins in Circulation
!!! IMPORTANT !!!
Do not exchange money in the streets or outside banks and currency exchange offices despite the advantageous rate offered.