Thousands of people slept in railway stations, airports and schools on Monday night after torrential rain drenched much of the south of France.
Air France offered on Monday to suspend the expansion of its low-cost operation Transavia in a bid to end the strike which has paralysed the flag carrier for more than a week.
Pilots at Air France have voted to continue their strike for a second week with the company cancelling more flights on Sunday than on preceding days.
Britain is to contribute 15 million euros to tighten security at the French Channel port of Calais, following attempts by migrants to break through barriers and cross to the United Kingdom.
Air France pilots are threatening to continue their strike next week if the company does not give in to their demands. At least 60 per cent of flights were to be cancelled on Thursday.