Philadelphia is bracing for a notable temperature increase, with forecasts indicating a rise to the 70s and 80s°F (21-27°C) by the weekend. This warm surge follows a period of cooler temperatures, ranging from the 40s to 50s°F (4-15°C), and recent overnight showers. Meteorologists have described this transition as a 'temperature roller coaster,' highlighting the rapid shift from cool to warm conditions.