In June, it was over 100 degrees here for five days straight. This is pretty bad for June in Colorado. Seems to be getting worse every year. The heat used to come in mid-July or -August, but the thermometer starts going up pretty high in April and May now (and then we'll still get snow the same week!).
My liquids have been fine. I don't have "central air" or air conditioning, either. I do live on the ground floor (garden level) in a condo complex. I keep my lights off, and a fan running. Most of my liquids are in small boxes in a closet, but I have several out on the desktop here. Nothing has bothered them, thus far. If I had really large bottles of liquids that were going to be hanging about for long periods of time, I might put them in the fridge, but for the 15ml to 50ml bottles I have, they won't be around long enough to worry much about.
I think you'll be fine, but if you are worried about them, the fridge won't hurt your liquids.