An image capture apparatus comprising: an image sensor having a plurality of pixels (301, 305, 306, 307) each of which includes a plurality of photoelectric conversion elements (303, 304); readout means configured to read out a signal for image forming and a signal for focus detection from the plurality of pixels; control means configured to control the readout means to switch between a first readout mode and a second readout mode, wherein the first readout mode is a mode comprising reading out both the signal for focus detection and the signal for image forming in each frame from the plurality of pixels and the second readout mode is a mode comprising reading out only the signal for image forming without reading out the signal for focus detection in each frame from the plurality of pixels; and determination means configured to determine based on the signal for focus detection whether an object image is in an in-focus state, wherein said control means is configured to control the readout means to read out, in the second readout mode, at least one frame next to a frame in which the in-focus state has been determined by said determination means, characterized by temperature detection means configured to detect a temperature of the image capture apparatus, wherein the control means is configured to control the readout means to read out the signal from the plurality of pixels in the second readout mode from a frame next to the frame in which the in-focus state has been determined by said determination means, and to change the number of frames to read out the signal from the plurality of pixels in the second readout mode based on the temperature detected by said temperature detection means. an image sensor having a plurality of pixels (301, 305, 306, 307) each of which includes a plurality of photoelectric conversion elements (303, 304); readout means configured to read out a signal for image forming and a signal for focus detection from the plurality of pixels; control means configured to control the readout means to switch between a first readout mode and a second readout mode, wherein the first readout mode is a mode comprising reading out both the signal for focus detection and the signal for image forming in each frame from the plurality of pixels and the second readout mode is a mode comprising reading out only the signal for image forming without reading out the signal for focus detection in each frame from the plurality of pixels; and determination means configured to determine based on the signal for focus detection whether an object image is in an in-focus state, wherein said control means is configured to control the readout means to read out, in the second readout mode, at least one frame next to a frame in which the in-focus state has been determined by said determination means, characterized by temperature detection means configured to detect a temperature of the image capture apparatus, wherein the control means is configured to control the readout means to read out the signal from the plurality of pixels in the second readout mode from a frame next to the frame in which the in-focus state has been determined by said determination means, and to change the number of frames to read out the signal from the plurality of pixels in the second readout mode based on the temperature detected by said temperature detection means.