Guadeloupe enjoys a temperate tropical climate, very nice throughout the year...
Don't forget to check that your passport or ID are valid If you stay longer, and if you are under medical treatment, please bring with you your prescriptions, especially if you have to renewed them, your health and insurance cards.
If you want to bring your pet with you, you need to have its passport, health booklet (with all vaccinations up to date) and a medical certificate of good health (less than 48h before the flight)
Pack as light as you can! You will bring back souvenirs and rum of course! See that you have bath suits, sun cream, shorts, tee-shirts, and... shampoo! (it's more expensive here than in Mainland)