Find out how often it rains, snows, and the gets cold or hot in Umatilla. Monthly average temperatures, rainfall, snow days & record high and low temperatures msn back to msn home weather records and averages powered by Microsoft News Monthly: 1981-2010 normals History: 2007-2019 Monthly averages Pendleton Longitude: -118.841, Latitude: 45.6951 Average weather Pendleton, OR - 97801. Station Data. Get the monthly weather forecast for Hermiston, OR, including daily high/low, historical averages, to help you plan ahead. Umatilla, Oregon detailed profile. It is 150% greater than the overall U.S. average. Based on weather reports collected during 1985–2015. Statistics The wind statistics are based on real observations from the weather station at Umatilla. On November 15, the temperature in Umatilla typically ranges from 37°F to 48°F and is rarely below 23°F or above 59°F. This is the wind, wave and weather statistics for Umatilla in Oregon, United States. It is 161% greater than the overall U.S. average. In Umatilla, the summers are hot and mostly clear, the winters are very cold and partly cloudy, and it is dry year round. Northeast Umatilla, Oregon detailed profile. Climate data and weather averages in Hermiston. Annual Weather Averages in Hermiston. Umatilla, Oregon Climate - 97882 Weather, Average Rainfall, and Temperatures Average Weather in Umatilla Oregon, United States. Earthquake activity: Umatilla-area historical earthquake activity is below Oregon state average. The first month of the autumn, September, is still a warm month in Umatilla, Oregon, with average temperature fluctuating between 80.8°F (27.1°C) and 48.9°F (9.4°C). Windfinder specializes in wind, waves, tides and weather reports & forecasts for wind related sports like kitesurfing, windsurfing, surfing, sailing or paragliding. Over the course of the year, the temperature typically varies from 27°F to 93°F and is rarely below 13°F or above 102°F. Umatilla County has an average temperature of 52.6F, which ranked #8 in Oregon. Complete climate information for Umatilla, Oregon. Also the historical Umatilla County weather info such as snow/precipitations data as well as heating and cooling cost index. Earthquake activity: Northeast Umatilla-area historical earthquake activity is below Oregon state average. Temperature In Umatilla, the average high-temperature drops, from a tropical 90.5°F (32.5°C) in August, to a warm 80.8°F (27.1°C).The average low-temperature, in September, is 48.9°F (9.4°C).