Traveling during 5th or 7th month?

skalway

I am planning to visit my family across country and am trying to decide between traveling my 5th or 7th month of pregnancy. The weather will be a lot nicer where I will be if I wait until my 7th month. However, I don't know if I am going to be so uncomfortable that I won't be able to enjoy the weather if I wait that long. 

This is my first child, so your advice on how you felt your 5th and 7th month is much appreciated.