baltimore average temperature by month
Baltimore: Annual Weather Averages. July is the hottest month in Baltimore with an average temperature of 28Â°C (82Â°F) and the coldest is January at 3Â°C (37Â°F) . The wettest month is May with an average of 106.2mm of rain.altimore: Annual Weather Averages. July is the hottest month in Baltimore with an average temperature of 28Â°C (82Â°F) and the coldest is January at 3Â°C (37Â°F) . The wettest month is May with an average of 106.2mm of rain.