The best season to visit Thanjavur would be between October and March. The months from June to September are humid but reasonably pleasant with moderate temperature that is conducive for sightseeing. The months between October and March however, are most suitable for visits to the attractions.
Summers in Thanjavur are usually quite hot with the temperature ranging from 25°C to 40°C. The days are especially hard on the body and tourists are advised to avoid too much travel/sightseeing during the days in April and May. Light clothes like tees and shorts are recommended.
During monsoon, light rainfall can be expected in Thanjavur. These slight showers add to the beauty of the place and also provide ready relief from the hot climate that is usually present during the daytime. If visiting in the months of june-september, tourists are advised to carry an umbrella as the gentle showers may turn into heavy ones at short notice.
Temperatures between 20 °C and 30 °C can be expected during the winter season in Thanjavur. Tamil Nadu is traditionally known to see some measure of rainfall during the months of December, and January so visitors during the winter months should bear in mind to carry an umbrella or a raincoat.