The monsoon typically bursts in Kerala in the first week of July - This is incorrect. The southwest monsoon typically arrives in Kerala around the first week of June (not July). It marks the official onset of the monsoon season in the Indian subcontinent.
The interior parts of India may experience monsoon delays until the first week of July - This is correct. After hitting Kerala, the monsoon gradually advances northward, and interior regions of central and northern India often receive monsoon rains by late June or early July.
There is a noticeable decline in day temperatures in the mid-June to mid-July period - This is correct. As the monsoon advances across India, it brings cloud cover and rainfall that significantly reduces daytime temperatures from the pre-monsoon heat.
The western ghats experience a temperature increase during the monsoon season - This is incorrect. The Western Ghats actually experience cooler temperatures during the monsoon due to increased rainfall, cloud cover, and humidity.