Temecula has mild weather year round. It makes for a great vacation escape any time of year.
Below are Weather Averages from weather.com. The elevation at the Rancho is about 1200 ft. So evenings are cool especially in the Winter and Spring.
The area got its name from the Luseno tribe of Native Americans who 300
years ago lived in this fertile valley tucked under the San Jacinto
mountains and called it Temecula - or "Sun Shining Through the Sea Mist."
An air balloon touching down in the neighbor's yard down the
street on an early morning June 2010.
Here is a link to some history about Temecula.
http://www.sandiegohistory.org/journal/72summer/temecula.htm