Average temperatures within Lausanne in the month of July is 17 with a high of 25 with low temperatures being around 13. The table below has further info:
Lausanne, Switzerland Weather in July FAQs
What weather should we expect?
The standard weather is usually 17
On average whats the weather difference summer vs. winter?
The average summer vs. average winter temperatures vary by 11 change in average daily temperature
Useful Links: Lausanne Weather: Average Weather & Yearly Climate