Other facts from our historical weather data: Which is the warmest month in Parkersburg? August has an average maximum temperature of 30°C (86°F) and is the warmest month of the year. Which is the coldest month in Parkersburg? The coldest month is January with an average maximum temperature of 4°C (39°F). Which is the wettest month in Parkersburg? June tops the wettest month list with 130mm (5.1 in) of rainfall. Which is the driest month in Parkersburg? November is the driest month with 65mm (2.6 in) of precipitation. No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.