If you're inclined to experimenting and you happen to have (access to) a multimeter with a temperature probe you can test this for yourself. On a sunny day find a spot where you have bare dry dark soil close to vegetation-covered soil. Put the temperature probe (generally a thermocouple) on a stand ca. 2 cm over the bare soil and leave it there for a minute, then read the temperature. Do the same on the vegetation-covered soil and again read the temperature. You'll quickly find that the temperature over the vegetation-less area easily rises to 90°C while that over the vegetation-covered area does not tend to climb much over 40°C. Now add some convection - wind or natural convection - to move that hot air from that soil or from under those panels to a neighbouring area and you'll find that is does have a significant impact.
I'm guessing in general solar is a win for the environment, I'm a big fan of the tech, it's the only way most people can generate power right at home without obnoxious fumes or noise or something.... But I wouldn't be surprised if the temperature did change.
Others have already addressed the plant argument.
Maybe you should get hired by a solar panels law firm and go to bat against nimbys in a court of law.
Any new technology will end up causing problems for a small minority in very specific circumstances. That doesn't mean we should ignore those issues - but it hardly matters to anyone who wants to install solar panels on their roof.
An interesting article on the topic. They measured temperatures over a year at 3 nearby sites (desert, parking lot, PV plant; Fig. 4 shows them on a map).