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). Earthquake activity: Northeast Umatilla-area historical earthquake activity is below Oregon state average. Also the historical Umatilla County weather info such as snow/precipitations data as well as heating and cooling cost index. It is 161% greater than the overall U.S. average. Based on weather reports collected during 1985–2015. 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). Climate data and weather averages in Hermiston. Umatilla, Oregon Climate - 97882 Weather, Average Rainfall, and Temperatures 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. Complete climate information for Umatilla, Oregon. Find out how often it rains, snows, and the gets cold or hot in Umatilla. Umatilla County has an average temperature of 52.6F, which ranked #8 in Oregon. Northeast Umatilla, Oregon detailed profile. Get the monthly weather forecast for Hermiston, OR, including daily high/low, historical averages, to help you plan ahead. This is the wind, wave and weather statistics for Umatilla in Oregon, United States. It is 150% greater than the overall U.S. average. Monthly average temperatures, rainfall, snow days & record high and low temperatures msn back to msn home weather records and averages powered by Microsoft News In Umatilla, the summers are hot and mostly clear, the winters are very cold and partly cloudy, and it is dry year round. Umatilla, Oregon detailed profile. Statistics The wind statistics are based on real observations from the weather station at Umatilla. 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