Weekly Weather Report for Cornelius, United States of America. Looking at the weather in Cornelius, United States of America over the next 7 days, the maximum temperature will be 2℃ (or 36℉) on Sunday 7 th January at around 2 pm. In the same week the minimum temperature will be -11℃ (or 13℉) on Saturday 6 th January at around 8 am.