Will standing in the sun make me lose weight? plz only answer if u read this all (about 8 setences)?

the other day when it was about 102 degrees outside, i was painting for about 9 hours, and my dad told me "come in and eat something before u get dizzy. when ur in hot weather, u dont think of eating, u just feel thirsty." and i noticed that too. u think that might help me those weight? (bcuz im not thinkin of hungrr. i just think of drinkin water.)