Mosaic of 8 NavCam images taken c. 15:40 local time on sol 1584. There've been quite a few cloudy early-mid summer afternoons like this of late (I hope to upload more examples later).
EDIT: I've added two more examples (from sol 1581 and 1577), both taken at the same time of day (15:00-15:30 hours).
Clouds at this location and time of year are not a surprise - the "aphelion cloud belt" is known to form in these tropical latitudes, and should last well into mid-summer here in the Nili/Jezero region. Evidently they can be seen later in the day as well - this example from about two months ago was taken after sunset.
Here's a processed tiled mosaic by Simeon Schmauß
Perseverance rover captured this afternoon view of clouds above the Nili Planum region on Sol 1584.
The raw images from the left and right Navigation camera were undistorted, leveled and stacked to reduce noise. The resulting image was then color calibrated and white balanced to approximate what the human eye would see on Mars.
Additional processing was applied to reduce some glare that stems from dust on the camera lens and the sky was enhanced slightly to bring out the detail of the clouds.
Credit: NASA/JPL-Caltech/Simeon Schmauß (licensed as CC BY 4.0) Link to source