The United Launch Alliance will attempt to launch a Delta IV rocket on Monday evening from Cape Canaveral Air Force Station, marking the fifth try in the last week.
The opening of a 65-minute window begins at 6:43 p.m., but weather pushed the projected clear weather time to 7:28 p.m.
Technical problems scrubbed the first try, but thunderstorms and lightning washed out the next three countdowns on Thursday, Friday and Saturday.
With the day off, the 206-foot Delta IV and its payload were returned to the shelter of a mobile service tower at Launch Complex 37. Atop the rocket are twin satellites that will look out for threats from other spacecraft orbiting more than 22,000 miles up, and a third experimental satellite.
The mission's delay to Monday has pushed back by one day, to Friday, the next launch on the Cape schedule: an Atlas V rocket carrying the seventh in a new series of Global Positioning System satellites. That launch is now planned at 11:23 p.m. Friday, with an 18-minute window.