It was 29 C between Christmas and New Year in Lanzarote last year.
Hot is not guaranteed for the Canaries, but it could well be, or at least very warm and is probably your best bet as there is plenty to do around the islands that don't rely on super hot weather. If you get a hotel with a heated pool, you can also swim.
Or if you go to one of the big AI hotels in Hurgarda in Egypt at least there's plenty to do on site and you can probably do some trips out.
For balance, here is the FCO advice for France cat
Terrorists are very likely to try to carry out attacks in France.
Attacks could be indiscriminate. Due to ongoing threats to France by Islamist terrorist groups, and recent French military intervention against Daesh (formerly referred to as ISIL), the French government has warned the public to be extra vigilant and has reinforced its own domestic and overseas security measures. You should be vigilant in public places and follow the advice of local French authorities.
There have been a number of high profile terrorist attacks since 2015 across France. On 13 November 2015 terrorist attacks killed 130 and injured hundreds more at multiple sites across Paris. On 14 July 2016, 84 people were killed when a truck was driven through a crowd of people on the promenade in Nice. On 3 February 2017, a knife attack inside the Louvre museum complex in Paris injured a French soldier. The attacker was arrested. On 6 June 2017, police shot a man after he attacked a police officer with a hammer outside the Notre-Dame Cathedral in Paris. On 23 March 2018, a man carried out various attacks in the Carcassonne area of southern France, killing 4 people. The police shot and killed the attacker.
There’s a heightened threat of terrorist attack globally against UK interests and British nationals from groups or individuals motivated by the conflict in Iraq and Syria. You should be vigilant at this time.