While tomatoes can split at any stage, it seems most frustrating when you're ready to harvest that delicious fruit for a tasty meal. They split due to fluctuations in the amount of water they receive. Heavy rain can cause the insides of the tomatoes to grow faster than the outer skin, resulting in the tomatoes cracking. You can't always prevent tomato splitting; a downpour that dumps several inches of rain on your garden in a few hours may result in split tomatoes no matter what you do. If your tomatoes do split, it's important to harvest them as quickly as possible because split tomatoes are much more susceptible to rot and insect damage.

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Source: The Spruce