Australian Day had to contend with driving wind and rain over his last four holes before organisers halted play at 1:34 p.m. PST (2134 GMT) due to unplayable conditions on the Monterey Peninsula in California.
One hour later, play was abandoned for the day with unheralded Americans Rick Lamb and Joel Dahmen, and South Korean Noh Seung-yul, sharing top spot on the leaderboard after opening with four-under 68s.
All three had started out on the Spyglass Hill layout, one of three venues being used for this week's PGA Tour event.
Seventy-four players in a field of 156 had completed their rounds and organisers hope to get the tournament back on track on Friday, though weather forecasts predict a 50 percent of rain at Pebble Beach on Friday morning.
"We only played four holes in the rain," Day told Golf Channel after mixing four birdies with two bogeys at Monterey Peninsula Country Club. "It's hit and miss ... sometimes you can get lucky with the draw, especially where you are playing.
"We only played four holes in the rain," Day told Golf Channel after mixing four birdies with two bogeys at Monterey Peninsula Country Club. "It's hit and miss ... sometimes you can get lucky with the draw, especially where you are playing.
