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 Portland Oregon, United States. Portland has a mediterranean climate with dry warm summers and mild winters. The temperature typically varies from 36Â°F to 84Â°F over the course of the year, and is rarely below 26Â°F or above 95Â°F. The warm season lasts for 88 days, from June 23 to September 19, with an average daily high temperature above 76Â°F.