Trip to Marrakech

Hey guys, me and my friend (2 boys) are going to Marrakech from June 3–6 and we’re planning a 2-day Merzouga trip on June 4–5. We already found a tour, but we’re mainly wondering about the weather.
Will the heat in early June be too much and ruin the experience? How hot does it usually get in Marrakech and especially in Merzouga during the day and at night?
Also, any extra tips are welcome:
things we should definitely do or avoid
scams/tourist traps to watch out for
best areas to stay in Marrakech (riad, hostel, hotel, etc.)
general advice for first time visitors
Thanks!