The rain doesn't care if it is day or night. Plants don't care if it rains day or night. Most plants don't so much like being top watered with cold water on a sweltering hot sunny day. Use a watering can and water at the base if a plant goes into heat prostration. I've had plants recover from some pretty serious wilting, so don't yank something as dead until you give it at least a day or two to recover.
Crop rotation goes a long way toward preventing diseases in the soil that may splash up when hose watering. Other mitigation varies from mulching, to installing drip lines, to simply trimming up the lower leaves of the plant so they aren't near the ground. My tomatoes get trimmed up as they grow so the whole bottom 1' of stem has no leaves. You don't pick produce when it is wet either to avoid the transfer of rot causing organisms.
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