Kerala travel budget ranges between 12K to 15K. Monsoon are good time to visit Kerala though you should carry umbrella, raincoat where ever you visit within the state. I will share a few monsoon spots to see in Kerala, see if it will be suitable for your travel. -Gavi paradise flora land
-Agasthyakoodam trekking spot
-Silent valley rain forest
-Areekkal falls Kochi for lush white cascade
-Kumbalangi ecotourism village
-Kundalahalli tea plantations.