Today (15.12.2021)
Moderate rain is likely to occur at a few places over districts of Coastal Tamilnadu,Puducherry & Karaikal area.
Light to moderate rain is also likely to occur at a few places over rest Tamilnadu.

Tomorrow (16.12.2021)
Light to moderate rain is likely to occur at isolated places over South Tamilnadu.
Mainly dry weather is likely to prevail over North Tamilnadu, Puducherry & Karaikal area.

LOCAL FORECAST FOR CHENNAI CITY AND NEIGHBOURHOOD:
For next 24 HRS:: Sky condition is likely to be partly cloudy. Light to moderate rain is likely to occur in some areas.
Maximum and minimum temperature is likely to be around 31˚C and 24 ˚C respectively.

Reference:
http://imdchennai.gov.in/tn_fc.pdf
http://www.imdchennai.gov.in/hrw_district.htm