The cooler temperatures and dark clouds marked a big change in the weather and caught many people off guard.
"I'm feeling like I should have brought a jacket or a sweater right now because this is getting a little colder, faster than I thought - considering three weeks ago, it was over 100 degrees," said Mark Evans of Pasadena.
The fall storm was expected to develop as the day goes on, bringing wind and rain.
Conditions were expected to be cool with a 30 percent chance of showers Wednesday morning and a 60 percent chance of rain in the afternoon. The storm was expected to bring up to half an inch of rain.
Temperatures were expected to hover in the 60s for most of Southern California, with the mountains seeing temperatures in the 40s.
In preparation, people wrapped up with scarves and coats. Many Southern California residents were excited to finally get a taste of fall-like weather.
"I'm glad to get rid of the hot weather and get to a little cooler, more enjoyable weather," said Larry Lindsey of Monrovia.
In Silverlake, light rain fell overnight, giving folks there a taste of what's to come.
Wind advisories were also in effect for the Ventura County and Los Angeles County mountains and Antelope Valley until 9 p.m.
Gusts up to 65 mph were expected to develop near the San Bernardino Mountains.
Conditions started off windy in Anaheim, but the strongest gusts were expected in the Antelope Valley and local mountains.
Most people remained positive about the change in weather but their attitude is different when it comes to driving in it.
"I don't like driving in the rain because, you know, us Californians can't drive in the rain," said Cynthia Maycurry of Los Angeles.
While it was rain for most of the Southland, it was the first snow of the season in our local mountains.
"It's snowing and it's great! Beginning of October snow -- what a fantastic time. I think this is a good sign of things to come," said Kim Hermon, the marketing director for Mountain High Resort.
So much heavy snow fell so quickly that a tree fell into a 34,000 volt power line, knocking out power to all of Big Bear. Restaurants served with flashlights for more than an hour until crews knocked down the tree and turned back on the lights.
The major ski resorts aren't open yet, but with all this fresh powder, many wish they were.
"To get snow this early is pretty unusual," said Brent Tregaskis, general manager of Bear Mountain.
Tregaskis hopes now to have his chair lifts moving by Nov. 1.
"We always shoot for Thanksgiving, but this is a blessing and this could really speed things up," he said.