I've got four WD drives...only one of them it seems is capable of reporting temps, that is the "JB" model. The "BB" models don't seem to report temps.
The program I use is HDD Thermometer...but if your drive doesn't, or can't report to S.M.A.R.T. then you won't get any readings.
Whether or not this will work with Seagates, and/or a RAID array I cannot say...
....WW (5.0)