In terms of precipitation, rainfall in Shillong ranges from 0.3 - 18.3 inches per month. June is typically the wettest month, when rainfall can reach 18.3 in. December is typically the driest time to visit Shillong when rainfall is around 0.3 in.
If weather is an important factor for your trip to Shillong, use this chart to help with planning. For those seeking warmer temperatures, June is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 50.0 F).