Sure! Here’s your text translated into English:
"My favorite season is summer because it is very warm and I can spend more time outside and go swimming. When it rains, I feel very sad and bored because I can’t go for a walk or ride my bike. Most often, I spend weekends at my grandmother's house, helping her and also going for walks with my friends. Thank you for your letter; I will be waiting for more letters from you. I hope everything is well with you."