Thanks. Wondering why they told me weather permitting.
This is a good sign that your selected contractor is concerned about long term quality and performance of your asphalt. Rain during or just before paving is not good.
Rain during will prematurely cool the mix prior to the final compaction. Generally the hotter the mix going into the paver the better. There's usually a "knockdown" pass of the roller not to far behind the paver, then subsequent passes that finally roll out the "roller marks". This is impractical sometimes on driveway work, so the hotter the longer that better. A lot of guys would just work through it regardless for the sake of the schedule. Then there's paving on a wet subgrade... similar reasons as above but there's more than those concerns.
The 90* temps are ideal for driveways and once the final rolling/compaction is finished let it rain all it wants.
Be cautious the first few months of "steering" while not moving-like turning around, especially on a sunny hot day. I don't know the science behind this, but even though it's cooled, it seems that time still "settles it down" and this is almost contradictory to my above statements but I've seen it enough to make it a rule.