Prague weather in June is very pleasant with warm temperatures lasting throughout the month and lots of sunshine. Temperatures are around 15°C at the beginning of the month with highs of 22°C. At night, it can get quite cold when the average temperature drops to 10°C. You’ll have at least ten hours of sunshine quite humid with an average level of 69% that can rise as high as 89%. Since temperatures fluctuate from day to night, you need to pack a mixture of warm and light clothing. You should also pack a raincoat or umbrella for the rain, which is around 67mm over 17 days of the month.