The typical weather conditions and weather variations on race day at the Portland Marathon can vary greatly. Located in the Pacific Northwest, near the confluence of the Willamette and Columbia rivers, Portland experiences a mild and temperate climate. However, on race day, participants should be prepared for a range of weather conditions. In October, when the marathon typically takes place, Portland experiences autumn weather, which means cooler temperatures and a likelihood of showers. The average temperature on race day ranges from about 50 to 60 degrees Fahrenheit (10 to 15 degrees Celsius). While rain is a typical characteristic of the region, it is important to note that the weather can be unpredictable. In some years, race day might see a light drizzle or occasional showers, while in others, participants might benefit from dry and sunny conditions. Therefore, individuals participating in the Portland Marathon should dress in layers, considering the possibility of rain and fluctuating temperatures.