Battery drain as weather turns warm

My 2007 Accord worked fine through out winter, as warm weather comes the battery died on me several times. I replaced the old battery, the new battery died again after only driving 30yds away at a gas station. Then I went back to the store, both batteries the old and new are checked, both are good. I noticed the radiator cooling fan was on whenever I turned key on without starting the engine, while I sense the radiator temp with my hand, it was only warm. So the fan turns on unnecessarily, draining the battery I assume. The car worked without issue during Michigan winter, because it was so cold, the fan never turned on. So my hunch is that the thermal sensor is bad, yet the dashboard shows the temp gauge didn't go crazy high. So I still try to figure out what went wrong. Thanks for your help.