I left out a few last things. Thank you.

They want to travel with a quite warm weather.
It can also be raining/rainy (which is correct?)
They'll need a back-up team in case they get ill or their motorbikes break down.
Their trip will finish in the USA, to be precise (OR "more precisely") in New York.
Can you say "During the spring the weather is warmner?
Can "that" be omotted in the sentence:
She said that he wasn't coming.

Omit quite.

both
spell "warmer" correctly and then yes
omitted (spelling) yes.

Sra