Why won't hurricane Marie bring remenants of rain to southern California?

Well, it's certainly possible that it will. While there are good agreements between the numerical weather prediction models right now, they are sometimes wrong. Generally now the models are showing the bulk of the moisture going elsewhere, but if you go back 5 days the European model was predicting fairly good rains in Southern California.

Generally to bring the storm closer to Southern California you need a deep upper level trough off the west coast that can grab the storm and steer it to the northeast. The trough has to extend pretty far south, to 25 N or further.

Under the right conditions a storm could bring more than remnants of a hurricane into Southern California--it could actually bring a hurricane. The best circumstances would be if a hurricane paralleled the coast of Baja California, then accelerated to a high speed as it approached. For example, at the moment, the sea surface temperature off of Baja California is supportive of hurricane to at least Punta Eugenia, about 325 nautical miles from San Diego. The strongest tropical cyclone to recently come into California was Kathleen, which had a forward speed that exceeded 30 knots. At that speed, a hurricane would be over sub-80 F water for less than 12 hours. t storm like Marie would not have time to spin down to tropical storm status in that amount of time.

While it doesn't look like Marie will be a big rain producer in Southern California, there is still at least a month left for that to be a possibility, from a different storm. Or the models could be wrong.

The jetstream, upper level winds in the atmosphere. The source link includes the map of the hurricane path and where rain is projected to go. The storm is actually closer to Arizona than California when below Baja and will go more west further from California.

Hurricanes do not need shear.

Hurricanes hate shear.

Hurricanes cannot exist in the sheared environment.

Any precipitation associated with Marie will head quickly east as it gains latitude and is caught up in the Westerlies which is why it by-passes SOCAL to the east.