A high pressure system will again bring sunshine to the Boston area this weekend. High temperatures will remain in the high 60s and low 70s °F, however, with the persistence of clouds early this morning as well as the arrival of cool northern air tomorrow during the day. While these temperatures are a bit cooler than those we have been used to the past few weeks, they are close to normal for this time of year. September often marks the time of year at which temperatures begin to fall with the arrival of autumn: The normal high temperature for September 1 in Boston is 9.2°F higher than the normal high for September 30. Certain events associated with warm weather are still possible, however. For instance, on this date in 1954, Hurricane Edna dumped 5.64 inches of rain in Boston.