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In terms of precipitation, rainfall in Ioánnina ranges from 0.4 - 6.7 inches per month. December is typically the wettest month, when rainfall can reach 6.7 in. August is typically the driest time to visit Ioánnina when rainfall is around 0.4 in.
If weather is an important factor for your trip to Ioánnina, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 77.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 41.0 F).