I had a similar issue just recently, where my apartment lost power for twelve hours before being restored. With the doors closed for the entire time, the temperature raised only a few degrees, even the milk had no difference in taste, with it only being cool as opposed to cold like usual. Like yourself, it was also at the peak of summer.
Fridges are usually pretty well insulated (as they'd have to be, or else the motors would never stop running to keep cool during the peak of summer), so outside of the eggs, if it was never opened, I wouldn't be too concerned. I only put a caveat on eggs because as someone that cant' stand eggs, I never buy them, and hence have no knowledge of how susceptible to temperature changes they are.
EDIT: Personal opinion. Do not take this as a green light to start making bacon omelettes with a big heaping glass of milk today.
I don't think anything will be wrong with that milk.
- If it's fresh milk, which I doubt, you should consume it in less than three days.
- If it's pasteurized milk, which is much more likely, it'll be unaffected.
Signs of spoilage are a sour smell and sour taste. You should make a habit of always smelling your milk (food) before drinking (eating) it. If it doesn't smell like you'd expect, taste it. If it doesn't taste like you'd expect, ditch it.
Milk is cultivated with lactobacillus, a bacteria that's beneficial for us. So, even though milk may taste sour, it doesn't mean that it's undrinkable. In Holland, there's sour-milk (karnemelk), that some people consume (I don't like it, myself).
Under the right circumstances, milk will turn into yogurt, thanks to the lactobacillus...
At any rate, if in doubt, throw it out.
Best Answer
It's fine. There's enough alcohol to prevent anything from growing in it. The worst that will happen is that it could get clumpy, which would be unpleasant and obvious.