The heavy rainfall is expected to impact 26 districts, including Chennai, Tiruvallur, Chengelpet, and Kancheepuram, as well as delta and interior districts. The rain may lead to waterlogging in low-lying areas and potential disruptions to daily life. Districts along the Western Ghats are under an orange alert for heavy to very heavy rain from 23 to 26 October, increasing the risk of localised flooding and landslides in these regions.