Seattle Washington Climate Data

Monthly Average Climate Data for Seattle Washington

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January36.6 °F47.1 °F5.37 in.
February36.8 °F49.7 °F3.69 in.
March38.9 °F53.6 °F4.15 in.
April42.2 °F58.6 °F3.01 in.
May47.4 °F65.5 °F2.0 in.
June51.8 °F69.7 °F1.67 in.
July55.2 °F75.7 °F0.77 in.
August55.5 °F76.4 °F0.94 in.
September52.0 °F70.8 °F1.6 in.
October46.0 °F60.3 °F3.81 in.
November40.2 °F51.5 °F5.86 in.
December36.4 °F46.2 °F5.83 in.
Annual44.9 °F60.4 °F38.7 in.

Climate Data for Seattle Washington

Average First Frost DateNov. 11 - Nov. 20
Average Last Frost DateApr. 1 - Apr. 10
Average Days With Frost20-30 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