Water is the life source of all living things. It’s best to water in the morning so foliage and stems may dry as the day goes by. Watering at night is not recommended. Also remember, the hotter it is, the more they will drink, so the frequency of your watering really depends on how hot or dry it is.
As a general rule, hanging baskets may need more watering as they’ll dry more quickly, so check them frequently.