In terms of precipitation, rainfall in Riau Islands ranges from 2.6 - 10.5 inches per month. November is typically the wettest month, when rainfall can reach 10.5 in. February is typically the driest time to visit Riau Islands when rainfall is around 2.6 in.
If weather is an important factor for your trip to Riau Islands, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 78.8 F).