Bradycardia can be caused by: 1  Changes in the heart that are the result of aging.  Diseases that damage the heart's electrical system. These include coronary artery disease, heart attack, and infections such as endocarditis and myocarditis.
Portland Weather In May. The highest recorded temperature in May for Portland for the past 70 years was 100 degrees Fahrenheit, most recently measured on May 28, 1983, and the normal high is 67.
Average Weather in June in Portland Oregon, United States. In Portland, the month of June is characterized by rising daily high temperatures, with daily highs increasing by 7Â°F, from 71Â°F to 78Â°F over the course of the month, and rarely exceeding 89Â°F or dropping below 60Â°F.