Hey!
June to September is monsoon season, when Lonavala sees heavy rainfall. If you don’t mind exploring with an umbrella in hand, then you will be rewarded with gushing waterfalls and glowing green surroundings.
Here is an article on a road trip to Lonavala you might enjoy reading - https://www.tripoto.com/lonavala/trips/lonavala-road-trip-itinerary-3495
Hope this helps.
Happy traveling :)
Lonavala becomes extremely beautiful during monsoons. So, yes one visit to Lonavala during the rains is a must. I recently stayed at The Fern an Ecotel, in case you want to read the whole experience. https://bulbulonthewing.com/the-fern-ecotel-lonavala-india/
One of the best monsoon gateway, lush green mountains, waterfalls all across, mist, garam Bhutta and Lonavala chikki, life is beautiful....go to tiger hills, and drive till Sahara city, beautiful drive in rains