Here's a curious pronunciation scheme from MW online:

"Pronunciation: "tem-p(&-)r&-'men-t&l, "tem-p&r-'"

Now, this supports those of you who say "tem-pruh-MEN-t&l..
but what does the second scheme mean? Tem-per...MEN-t&l?

Neither of those offered seems to enunciate the "a" following "temper"...

...but I could be read those &s incorrectly. Help, please.

Edit Addition:

And here's from AHD online:

"tmpr-mntl, tmpr--"

Well, that didn't copy out correctly because AHD agreed with MW's first pronunciation, but the second one showed enunciation of the "a" in question.