°F. Lows 37 to 42. We’ve collected seasonal averages for all seven regions of Oregon to give you an idea of what you can expect when you’re here. Get the Oregon weather forecast. See the latest Oregon Doppler radar weather map including areas of rain, snow and ice. Oregon weather can be surprising — that’s an understatement — but you don’t have to let it catch you off-guard. Roberts Field Airport is 83 miles from Eastern Oregon, so the actual climate in Eastern Oregon can vary a bit. Based on weather reports collected during 1985–2015. NOAA National Weather Service National Weather Service. Mostly cloudy with a 50 percent chance of showers. Access hourly, 10 day and 15 day forecasts along with up to the minute reports and videos from AccuWeather.com Eastern Oregon Extended Forecast with high and low temperatures. Last 2 weeks of weather Annual Weather Averages in Roberts Field Airport. West wind 10 to 15 mph. Our interactive map allows you to see the local & national weather