The weather forecast for Chennai at this time of year (late September early Oct) is a high in the mid 90's and it will feel like the low 100's. The low will run in the high 70's to low 80's. At this time of year you also experience quite a bit of rain. It is wise if traveling by air in or out of the region to check for flight delays as these occur often due to weather. To look up the current
. day's forecast or the forecast for the next 10 days go to www.weather.com. You can enter in the city you are interested in worldwide and get the forecast.