A rainfall warning is in effect for Kapuskasing, Hearst and Smooth Rock Falls.
Environment Canada says heavy rainfall is expected as well as thunderstorms to come through the area today.
The weather agency says 15 to 25 millimetres of rain is expected today and may continue tonight and into tomorrow morning in Kapuskasing.
Heavy downpours can cause flash floods says Environment Canada, so they warn that you stay away from pooling on the roads and low-lying areas.
The rain is expected to slow down and taper off tomorrow.