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San Gregorio, California facts for kids

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San Gregorio, California
Historic San Gregorio General Store, corner of California Highway 84 and Stage Road, May 2008.
Historic San Gregorio General Store, corner of California Highway 84 and Stage Road, May 2008.
San Gregorio, California is located in California
San Gregorio, California
San Gregorio, California
Location in California
Country United States
State California
County San Mateo
 • Total 16.7 sq mi (43.3 km2)
 • Land 16.7 sq mi (43.3 km2)
 • Water 0 sq mi (0 km2)
66 ft (20 m)
 • Total 214
  2010 United States Census
Time zone UTC-8 (PST)
 • Summer (DST) UTC-7 (PDT)
ZIP code
Area code(s) 650
FIPS code 06-67084
GNIS feature ID 1659577

San Gregorio (Spanish for "St. Gregory") is an unincorporated community in San Mateo County, California, with a population of 214 people. It is located in the San Francisco Bay Area, south of Half Moon Bay. Just east of Highway 1, it is one mile (1.6 km) inland on Highway 84, from San Gregorio State Beach. It is also located 7 (11.4 km) north of Pescadero via Stage Road and 8 miles (12.8 km) west of La Honda via SR 84.


California 2008 - Rob 095
Historic San Gregorio General Store, corner of California Highway 84 and Stage Road, May 2008

San Gregorio has a cool summer Mediterranean climate (Köppen climate classification Csb).

A National Weather Service cooperative weather station has been in operation in San Gregorio since June 1, 1954. San Gregorio enjoys mild weather throughout the year, except for some remarkably chilly mornings, even in the summer. Fog and low overcast are common in the night and morning hours, too, especially in the summer. The fog usually clears to the shoreline by the afternoon. Temperatures are often much warmer just a few miles inland than on the coast. Most of the rainfall falls from November through April.

Normal annual precipitation is 29.52 inches (74.98 cm). San Gregorio has an average of 92.3 days with measurable rain. The wettest year on record was 1983 when 57.86 inches (146.96 cm) of rain fell. The wettest month recorded was 12.13 inches (30.81 cm) in February 1998. The maximum 24-hour rainfall was 6.87 inches (17.44 cm) on December 23, 1955. Although snow is very rare in the coastal lowlands, 4.0 inches (10 cm) fell in San Gregorio on January 21, 1962.

January is the coolest month with an average high of 60.1 °F (15.6 °C) and an average low of 40.3 °F (4.6 °C). September is the warmest month with an average high of 72.5 °F (22.5 °C) and an average low of 49.3 °F (9.6 °C). The highest temperature on record was 99 °F (37 °C) on October 5, 1987. The lowest temperature on record was 20 °F (-6.6 °C) on December 20, 1998. Temperatures exceed 90 °F (32 °C) on an average of only 1.8 days, but have occurred in April, May, June, July, August, September, and October. Freezing temperatures (32 °F / 0 °C) or below are more common, occurring on an average of 13.1 days, and have been recorded in January, February, March, April, May, June, October, November, and December.

Climate data for San Gregorio, California
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Average high °F 60.1 60.3 60.2 62.1 63.8 67.1 69.9 71.1 72.5 70.5 64.8 60.7 65.2
Average low °F 40.3 41.6 42.2 42.6 46.0 48.2 50.6 51.1 49.3 45.4 41.7 39.1 44.8
Precipitation inches 5.71 5.37 4.60 2.00 .85 .29 .13 .20 .41 1.67 3.93 4.36 29.52
Average high °C 15.6 15.7 15.6 16.7 17.7 19.5 21.1 21.7 22.5 21.4 18.2 15.9 18.4
Average low °C 4.6 5.3 5.7 5.9 7.8 9.0 10.3 10.6 9.6 7.4 5.4 3.9 7.1
Precipitation mm 145 136 117 50.8 21.6 7.4 3.3 5.1 10.4 42.4 99.8 110.7 749.8
Source: "Climatography of the United States," National Climatic Data Center (


The first European land exploration of Alta California, the Spanish Portolà expedition, passed through the area on its way north, camping for three days near today's San Gregorio, October 24–26, 1769. Franciscan missionary Juan Crespi noted in his diary, "This is a fine place, with good lands and an abundance of water, where a good mission could be placed". No mission was ever established here, however. The string of Spanish Missions established over the next 50 years followed a more inland route through San Jose. During the Mexican era, the area was part of Rancho San Gregoria.

California 2008 - Rob 096
Interior of San Gregorio General Store

Named after Pope Gregory I (Saint Gregory the Great). San Gregorio was a booming town in the 1850s, when wealthy San Franciscans would travel to the San Gregorio House by stagecoach to enjoy fishing, hunting, sea bathing, and boat races. The building still stands, but is no longer a functioning hotel. In the nineteenth century, a Chinese community had lived along the creek which runs through San Gregoria, however the buildings of the former community were washed away due to heavy rains. The San Gregorio General Store has been operating since 1889. The original stagecoach stop stands across Highway 84 from the store. In 1915, the community was home to seven cheese factories. San Gregorio has been the site of several film locations and television show episode scenes.

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