Templeton is a census-designated place in San Luis Obispo County, California. The population was 7,674 at the 2010 census, up from 4,687 at the 2000 census.
Templeton is located at 35°33′14″N 120°42′34″W (35.553847, −120.709469). It is approximately five miles (8 km) south of Paso Robles and five miles north of Atascadero along U.S. 101. State Route 46 intersects U.S. 101 on the north edge of the town. According to the United States Census Bureau, the CDP has a total area of 7.8 square miles (20 km2), 99.37% of it land and 0.63% water. However, much of the surrounding unincorporated area between Atascadero and Paso Robles is considered as part of Templeton, with most U.S. mail for this area addressed as such.
Templeton has a Mediterranean climate that is characterized by mild winters and dry summers. The area usually has low humidity. Rain generally falls only between November and March, with the rainy season tapering off almost completely by the end of April. Temperature lows can reach from 20 to 25 °F (−7 to −4 °C) in the winter, and highs can reach 100 °F in the summer, with the highest recorded temperature being 115 °F (46 °C).
Like much of the nearby area, Templeton occasionally receives significant but temporary fog through parts of the year. In summer, Templeton will occasionally receive fog due to its proximity with the California Coastal Range, Pacific Ocean, and the higher valley temperatures of Templeton itself; the differential in density between the warm rising air in the valley causes it to be displaced with the descent of the cooler marine air layer via the Templeton Gap in the Santa Lucia Range. Similarly, in winter, Templeton will occasionally receive morning fog due to the temperature differential with the Central Valley. Although it is rare to see snow in Templeton, it did snow on December 15, 1988, leaving between 5 and 8 inches of total snowfall.
Templeton, is a small, fast growing, rural town. It has added dwelling units faster since 1990 than any other community in the county (a 63% increase), with developments competing with vineyards for prime land.