An image forming apparatus includes a heat generation member to heat a recording material placed on a placement portion, an image forming unit, a detecting unit, a measuring unit, a storage unit, and a control unit. The image forming unit forms an image on the recording material conveyed from the placement portion. The detecting unit may detect information about a recording material characteristic. The measuring unit may measure a moisture content around the image forming apparatus as information. The storage unit stores information about a moisture content around the placement portion when the heat generation member is energized. When the heat generation member is not energized, the control unit sets an image forming condition based on an obtained detection result and measuring unit information. When the heat generation member is energized, the control unit sets the image forming condition based on the obtained detection result and the stored information.