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Coonoor and Coorg would be good options- won't be too hot and they're gorgeous and quaint hill stations. Here's a travel guide for Coonoor- https://thehungrytrotter.com/2017/05/29/the-conoor-travel-guide/ and one for Coorg- https://thehungrytrotter.com/2016/02/13/coorg-the-great-escape/
Hope this helps!
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