Be prepared for the day. Chennai, Tamil Nadu, India's afternoon weather forecast for today and the next 15 days. 12 day Chennai Weather Forecast. Current weather in Chennai and forecast for today, tomorrow, and next 14 days. Be prepared with the most accurate 10-day forecast for Chennai, India with highs, lows, chance of precipitation from The Weather Channel and Weather. Today's and tonight's Chennai, Tamil Naduweather forecast, weather conditions and Doppler radar from The Weather Channel and Weather.