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@Cramer
The risk of watering at night is that plant leaves stay wet which can promote fungus/mildew growth and wet attracts slugs and snails. Watering when the sun is high and hot can scorch leaves and the water evaporates faster. It is best to water deeply in the early morning so the plants have the resources to get them through hot weather. If early morning is not possible, then water before the sun sets so leaves have time to dry.
Of course, if you see plants that are wilting, it is absolutely okay to give them water. Just try to keep from soaking the foliage.
https://extension.illinois.edu...
