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Manufacturers universally tell you to refrigerate mayonnaise once opened, though, because it helps preserve the flavor. Warmth causes mayonnaise to break down after a while, and it gets to the point where it just tastes oily. Homemade mayonnaise, of course, is a different matter. With its use of raw eggs, it is highly perishable and should be consumed immediately or refrigerated and finished off very shortly.
If you leave commercial mayonnaise unrefrigerated, taste suffers and out in the warm sun, it turns brown. A refrigerator set at 40 degrees Fahrenheit maintains the quality of an open jar of mayonnaise for up to two months.