Bardolino: Annual Weather Averages. July is the hottest month in Bardolino with an average temperature of 24°C (75°F) and the coldest is January at 2°C (36°F) with the most daily sunshine hours at 12 in July. The wettest month is August with an average of 88mm of rain.ardolino: Annual Weather Averages. July is the hottest month in Bardolino with an average temperature of 24°C (75°F) and the coldest is January at 2°C (36°F) with the most daily sunshine hours at 12 in July. The wettest month is August with an average of 88mm of rain.