HELP!/Sedum Autum Joy

Dear gardeners,
    I need help!  I was doing my usual evening walkabout checking all the
gardens and tonight I noticed that many of the bottom leaves of my Sedum
AUTUMN JOY were turning yellow and falling off.  After closer inspection, I
saw that some of the yellowing leaves had brown, curling edges and spots on
the back.  They are also very thin and limp feeling.  There is also mildew,
that I can recognize.  But, is the leaf problem due to not enough or too
much water????  It has been very hot and humid lately=mildew.  I don't know
whether to water in the morning or not.  The ground around the plants feels
dry on the surface, but I did not check deeper.  Could someone explain the
difference between the yellowing of overwatering vs underwatering?

Thanks so much,
Lynn
Zone 7b, where it is 95 and above every day now



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