Three storm systems will bring rain and a temperature drop of more than 10 degrees to Temecula starting Thursday night, Nov. 12, according to the National Weather Service.

The storms are part of a three-system sequence expected to hit Southern California through about Wednesday, Nov. 18, Patch first reported. The stretch follows days of unseasonably warm weather, with temperatures across the region hovering in the upper 80s to low 90s.

The NWS point forecast for Temecula calls for a sunny Thursday with a high near 80. That changes fast. Showers become possible after 10 p.m. Thursday, with a 30% chance of precipitation and less than a tenth of an inch expected.

Friday, Nov. 13, brings a 60% chance of showers, mainly between 10 a.m. and 4 p.m., with a high near 69. The heavier rain arrives Friday night, when the chance of precipitation climbs to 90% and a quarter to half an inch of rain is possible, according to the NWS forecast.

Saturday, Nov. 14, keeps a 70% chance of showers, mainly before 10 a.m., with a high near 67. Saturday night should be partly cloudy with a low around 46.

Second and third systems follow

NWS meteorologist Casey Oswant told Patch that a second, faster-moving system is expected to arrive by Monday, Nov. 16.

"It does look pretty likely that we will see additional rain sometime Monday and Tuesday," Oswant said. "There is still uncertainty in the details, but a lot of our guidance is showing rain."

The NWS Temecula forecast reflects that outlook: Monday shows a chance of showers with a high near 66, and Monday night calls for showers likely with a low around 44.

A third possible system may arrive by Wednesday, Nov. 18, or Thursday, Nov. 19, the National Weather Service reported. The Temecula point forecast for Nov. 18 shows a chance of showers with a high near 66.

Sharp temperature swing

By Monday, Nov. 16, highs across much of Southern California are expected to top out in the upper 60s, Patch reported. The NWS Temecula forecast shows highs between 65 and 69 degrees through Wednesday, Nov. 18.

The NWS San Diego office labeled Thursday, Nov. 12, as a "cooling trend beginning," with highs in the upper 70s to lower 80s in the coastal basin.

No flood watch in effect, but sandbags available

As of Wednesday, Nov. 11, the NWS San Diego office listed active advisories for small craft, wind, beach hazards and air quality. No flood watch or flood advisory was in effect for Temecula or inland Riverside County.

NWS forecasters warned that residents should prepare for downpours starting as early as Thursday night, Nov. 12, and lasting through the week of Nov. 16, Patch reported.

The city of Temecula provides up to 10 free sandbags to residents before or during storms, according to the city's Office of Emergency Management. Bags can be picked up at any Temecula fire station and filled at the city-owned sand lot at the corner of Ynez Road and Santiago.

Residents can sign up for emergency notifications through Temecula Alert at temeculaca.gov and Alert Riverside County at rivcoready.org.