So in general, regarding perishable foods like meat, most dairy, unshelled eggs and shell eggs (in the US) , cooked casseroles, and so on: if the food (or its perishable components) have been at room temperature for more than two hours, you should discard that food.
This directly effects how comfortable it will feel outside. Many times, relative humidity can be misleading. For example, a temperature of 30 and a dew point of 30 will give you a relative humidity of 100%, but a temperature of 80 and a dew point of 60 produces a relative humidity of 50%.
So if you want a real judge of just how dry or humid it will feel outside, look at the dew point instead of the RH. The higher the dew point, the muggier it will feel. General comfort levels that can be expected during the summer months: less than or equal to 55: dry and comfortable.