Hello how may I help you? Can you tell me which river it is that goes through Prague? That would be the Vltava River! Great! That's what i thought it was. Thank you. Is there anything else about Prague you'd like to know? What is the average high and low temp in June? the average high is 78 degrees and the average low is 55 degrees. Great. Thank you for your help. No problem! Let me know if you need any other information That is all for now. I appreciate your help. Have a nice day