The forecast for Sunday's game against Seattle at the Peoria Sports Complex calls for a high of 52 degrees with a 70 percent chance of rain.
The Padres are still sorting through their pitching schedule for upcoming Cactus League games, though pitching coach Darren Balsley said Wednesday that Luebke, who is here in camp trying to win a job in the starting rotation, and Stauffer will each pitch Sunday.
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Stauffer is projected as the probable fourth starter in the Padres rotation -- behind Mat Latos, Clayton Richard and newcomer Aaron Harang.
Stauffer went 6-5 with a 1.85 ERA over 32 appearances last season, most of which were spent in long relief until he moved into the rotation in September.
Luebke is battling this spring with Dustin Moseley and Wade LeBlanc for the fifth spot in the starting rotation, a spot the Padres won't actually need until the third week of the regular season because of three off-days in the first eight days of the season.
Moseley and LeBlanc have considerably more experience at the Major League level than Luebke, who went 10-1 between Double-A San Antonio and Triple-A Portland before he joined the Padres in September. He went 1-1 with a 4.08 ERA in four games, including three starts.
The only pitcher who won't be available for the Padres this weekend will be All-Star closer Heath Bell, who is recovering from a strained left groin. Bell threw his second bullpen session of the week and could be cleared for running and full baseball activities in the next few days.
Another pitcher, 20-year-old Juan Oramas, still has yet to be cleared to throw bullpen sessions after suffering a left shoulder strain last week.
The Padres have scheduled an intrasquad game Saturday to give many of the pitchers in camp an opportunity to throw.