I googled patron saints of good weather (there are 3):
Agricola of Avignon (he is also patron saint of rain, so don't pray to him, he might get confused
Clare of Assisi (she also patron saint of eyes, telephones, embroiderers, TVs, TV writers,)
Medard of Noyon (he was sheltered from a storm by an eagle, he is also patron saint of brewers, against sterilty, peasants, metally ill, toothaches,vineyards)
There's also a bunch of saints if you do a search for sailors,
but Saint Christopher is for sailors, and travellers, he's my pick.
BTW (8yrs catholic school for me, 13yrs for DH) DD and DS will start this fall in preK 4 so it may be 14 yrs for them. DH works at their school, it's elementary, girl's HS, and a 4 year college run by Dominican sisters (white habits)
As far as mass, on vacation we usually exercise travel dispensation.