Check tire light comes on whenever the weather gets cooler at night

That is NORMAL under the conditions you describe. MOST LIKELY to occur when the tire pressure is set nearer to the 'threshold' pressure for the light to come on , which in most cases is 27psi. Set the tires to 35psi WHEN THEY ARE COOLEST IN THE A.M. --, however that is most likely not practical for most of us without an air compressor in our garage. So , in that case , request that whoever sets the pressures , do so with an accurate gauge and set them 3psi over specification. That will allow for a 70 degree fluctuation in ambient temperature without the tires falling below the limit(threshold) to turn the warning light on. 10 degrees change in air temp = 1psi in tire pressure. ....Hope that made a little sense.