Aww Clio.. don't let this worry spoil your anticipation of your wonderful day.
My daughter got married at Christmas last year, it was torrential rain, both cars, rolls and daimler broke down on the way as they had to go thro' floods, and we were rescued by a farmer, and ended up arriving in a sheep truck, me, daughter, bridesmaids and my husband.. very late,but we all laughed our way thro' it, we have lovely photos... photographers are very clever...so in spite of the weather the happiness was there, and it will be for you.