Don't baby it.
The vast majority of the people who have trouble with their salvias can't leave well enough alone and end up doing more damage with constant maintenance than they would if they just let the plant do it's thing. It's a very adaptable plant. If you change it's conditions, the leaves may wither and brown, but the next generation of leaves will do just fine.
Ideal temperature is 60-80 deg F, but it can candle +-10 degrees outside that range. Plant it in a big pot, since it will grow quickly, especially the roots. Let the plant tell you when it wants to be watered: I water when I notice the leaves are wilted and when I do, I give it a good soaking. Otherwise, I just let it be. Normal organic potting mix will be fine.
I live in Massachusetts and I just left my plant outside all summer and it has done beautifully with minimal care. Temperatures range from 60-90, it rains intermittently, and is generally pretty humid. Got about a 1ft of growth, a lot of branching, minimal browning, and nice, healthy-looking leaves.
It's a strong plant, trust it to take care of itself.
Blessings
~ND
Also, I think this should go in Ethnobotanical Garden.
"There are many paths up the same mountain."