Foster City California Climate Data

Monthly Average Climate Data for Foster City California

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January43.4 °F58.1 °F3.68 in.
February45.1 °F60.7 °F3.72 in.
March46.8 °F63.4 °F2.68 in.
April48.3 °F65.9 °F1.4 in.
May51.5 °F68.9 °F0.52 in.
June54.1 °F72.0 °F0.18 in.
July56.4 °F74.0 °F0.02 in.
August56.6 °F74.4 °F0.03 in.
September55.9 °F75.2 °F0.08 in.
October52.9 °F72.1 °F0.72 in.
November47.3 °F63.9 °F1.71 in.
December43.1 °F58.3 °F3.87 in.
Annual50.1 °F67.2 °F18.61 in.

Climate Data for Foster City California

Average First Frost DateJan. 1 - Jan. 10
Average Last Frost DateFeb. 1 - Feb. 10
Average Days With FrostFrost Rare
Plant Hardiness Zone - 2023Zone 10a : 30°F to 25°F
Plant Hardiness Zone - 2012Zone 10a : 30°F to 25°F
Current Drought ConditionsNormal
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate