Sammamish Washington Climate Data

Monthly Average Climate Data for Sammamish Washington

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January36.3 °F47.4 °F5.71 in.
February36.4 °F50.1 °F4.23 in.
March38.9 °F54.0 °F4.61 in.
April42.4 °F59.3 °F3.69 in.
May47.7 °F66.1 °F2.4 in.
June52.1 °F70.2 °F2.18 in.
July55.5 °F76.8 °F0.85 in.
August55.6 °F77.5 °F1.04 in.
September51.9 °F71.8 °F1.94 in.
October45.7 °F61.0 °F4.48 in.
November40.0 °F51.9 °F6.45 in.
December36.1 °F46.5 °F6.04 in.
Annual44.9 °F61.1 °F43.62 in.

Climate Data for Sammamish Washington

Average First Frost DateNov. 1 - Nov. 10
Average Last Frost DateApr. 11 - Apr. 20
Average Days With Frost40-50 Days
Plant Hardiness Zone - 2023Zone 9a : 20°F to 25°F
Plant Hardiness Zone - 2012Zone 8b : 15°F to 20°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate