The entire Pirates team had planned to wear Robinson's No. 42 in one of the games on Sunday and Barry Bonds of the Giants also had planned on wearing Robinson's number.
At this time the Pirates have not formalized any plans for the Robinson celebration at a later date.
The postponement enabled the Pirates to leave early for their trip to St. Louis.
The postponement will alter the Pirates' pitching plans for their road swing to St. Louis, Milwaukee and Los Angeles.
Right-hander Ian Snell will start for the Pirates on Monday in St. Louis and lefty Tom Gorzelanny will pitch on Tuesday against the Cardinals.
"The weather we've played in since leaving Houston obviously has not been good," Pirates manager Jim Tracy observed. "But I think whether it's our team or the teams that we were playing against, everybody has done everything they possibly can to play good baseball under the circumstances that we're dealing with.
I think that the silver lining is that we haven't played great baseball, but we haven't played badly either. The other part, when I said a silver lining, is we haven't gotten anybody hurt. Fortunately, we're not dealing with a hamstring or quad issue that's looking like a disabled list situation or a three- or four-week deal. That's the one thing that you worry about when you're dealing with weather like this and playing baseball."
Tickets for Sunday's doubleheader can be used for the rescheduled doubleheader or can be exchanged for any remaining home game during the 2007 regular season, excluding Aug. 16, Aug. 17 or Aug. 18, which are Skyblast dates.
Sunday's Kids Glove promotional giveaway, sponsored by Dick's Sporting Goods, will be rescheduled for Sunday, Sept. 30.
George Von Benko is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.