Maximum temperature yesterday: 74 ☏ (at 4:52 pm) Minimum temperature yesterday: 50 ☏ (at 4:11 am) Average temperature yesterday: 61 ☏. Weather Underground provides local & long-range weather forecasts, weatherreports, maps & tropical weather conditions for the Oswego area.14-day weather forecast for Oswego (IL).Oswego Temperature Yesterday. Local Oswego High School Illinois 14 Day Extended ForecastsOswego Weather Forecasts. Weather in oswego illinois Oswego High School IL 14 Day Weather Forecast - Long range, extended Oswego High School, Illinois 14 Day weather forecasts and current conditions for Oswego High School, IL.
