Even with the warm day today, this is the coldest 1st half of October ( 1st 16 days ) in Seattle since 1990 ( 51.5° ). The average temperature currently stands at 51.9°, about 4° below normal. The coldest 1st half of October was in 1946 with an average temperature of 49.3°. #wawx

— NWS Seattle (@NWSSeattle) October 17, 2021