Weather Springfield, Oregon, USA. Springfield is currently growing at a rate of 1.36% annually and its population has increased by 8.95% since the most recent census, which recorded a population of 59,403 in 2010. Detailed hourly weather forecast, today 07/16/: partly cloudy, 30 °C, tomorrow 07/17/: clear, 26 °C, the day after tomorrow 07/18/: clear, 28 °C, weather forecast for 10 days Springfield (from 07/19/ to 07/24/): the highest temperature over the day 28 to 35 °C, the lowest temperature at night 11 to 15 °C. Springfield is a city in Lane County, Oregon, United States.Located in the Southern Willamette Valley, it is within the Eugene-Springfield Metropolitan Statistical Area.Separated from Eugene to the west, mainly by Interstate 5, Springfield is the second-most populous city in the metropolitan area after Eugene.As of the 2010 census, the city has a total population of 59,403. Springfield average temperature. See long range weather forecasts for the next 60 days for the Pacific Northwest Region. Check out our current live radar and weather forecasts for Springfield, Oregon to help plan your day The Old Farmer's Almanac's extended forecasts can be used to make more informed decisions about future plans that depend on the weather, from vacations and weddings to gardening, hiking, and other outdoor activities. Springfield Weather by month // weather averages It is 4.6 °C | 40.3 °F. Want to know what the weather is now? January has the lowest average temperature of the year. With an average of 19.3 °C | 66.7 °F, August is the warmest month. Springfield is a city located in Oregon.With a 2020 population of 64,717, it is the 9th largest city in Oregon and the 592nd largest city in the United States. Plan you week with the help of our 10-day weather forecasts and weekend weather predictions for Springfield, Oregon SPRINGFIELD, OREGON (OR) 97478 local weather forecast and current conditions, radar, satellite loops, severe weather warnings, long range forecast.