Weather in Snohomish County

Calculated from weather data of Seattle Paine Field International (KPAE) between 2020 and 2024.

Maximum temperatures (°F)

Month	Average	2024	2023	2022	2021	2020
January	46.0	46.0	47.0	45.0	47.0	47.0
February	45.0	49.0	45.0	46.0	43.0	47.0
March	52.0	54.0	51.0	52.0	51.0	49.0
April	56.0		55.0	55.0	60.0	58.0
May	64.0		68.0	59.0	62.0	65.0
June	69.0		70.0	68.0	74.0	67.0
July	74.0		76.0	76.0	75.0	72.0
August	76.0		77.0	78.0	74.0	74.0
September	69.0		69.0	72.0	67.0	72.0
October	58.0		61.0	64.0	56.0	57.0
November	50.0		51.0	47.0	51.0	50.0
December	45.0		50.0	39.0	40.0	48.0
Average	58.0	50.0	60.0	59.0	58.0	59.0

Average highest temperature per day

The maximum temperature is typically observed some hours after noon.

Minimum temperatures (°F)

Month	Average	2024	2023	2022	2021	2020
January	38.0	38	40	37	39	39
February	36.0	41	37	37	36	37
March	40.0	42	38	41	38	38
April	43.0		42	41	43	44
May	50.0		52	47	48	51
June	53.0		52	54	56	52
July	56.0		56	58	55	55
August	58.0		60	60	57	56
September	55.0		55	55	53	56
October	47.0		49	50	46	48
November	41.0		41	36	43	41
December	38.0		42	33	33	40
Average	45.0	40.0	47.0	46.0	46.0	47.0

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Cold and hot days

Number of days	2024	2023	2022	2021	2020
86 °F or warmer	0	4	7	6	1
77 °F or warmer	0	35	36	27	21
68 °F or warmer	2	110	104	91	83
32 °F or colder	9	12	20	15	10

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	17.6	26	20	11	24	22
February	19.1	17	24	13	21	14
March	14.3	18	9	16	12	10
April	13.5		19	11	5	6
May	9.5		8	21	5	13
June	7.5		8	10	7	13
July	1.6		1	1	0	5
August	2.3		3	3	2	3
September	6.2		7	1	10	6
October	10.2		11	8	14	8
November	17.2		8	18	29	19
December	16.0		22	10	16	18
Average	11.8	20.4	11.1	10.2	11.0	10.9

Precipitation during daylight period

Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.

Wind speed (miles per hour)

Month	Average	2024	2023	2022	2021	2020
January	8.3	8	8	8	8	11
February	7.6	8	8	7	8	7
March	8.4	8	8	8	9	9
April	8.9		10	9	7	8
May	6.8		6	8	7	7
June	6.8		7	7	7	7
July	6.1		7	6	6	6
August	6.2		6	7	6	6
September	6.8		7	6	7	6
October	7.2		7	7	9	6
November	8.1		7	7	11	9
December	7.3		7	6	8	8
Average	7.4	7.9	7.1	7.1	7.7	7.4

Average wind speed

Excluding wind gusts. Only observations between sunrise and sunset are taken into account.

Prevailing wind direction

Month	2024	2023	2022	2021	2020
January	S	SE	S	SE	S
February	S	S	S	S	S
March	S	S	S	S	S
April		S	S	SW	SW
May		NW	S	SW	SW
June		W	SW	W	SW
July		NW	NW	NW	NW
August		NW	W	NW	NW
September		SW	NW	S	W
October		SE	S	S	S
November		S	SE	S	S
December		SE	E	S	S

Prevailing wind direction

Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.

Snohomish County weather Q&A

What is the warmest month in Snohomish County?

The warmest month is August with an average temperature of 76 °F over the past years.

What is the coldest month in Snohomish County?

The coldest month is February with an average daytime temperature of 45 °F in the past few years.

Which month is the wettest in Snohomish County?

Chance of precipitation is the highest in February with a probability of around 19.1 %.

Which month is the driest in Snohomish County?

The least rainfall and snow can be expected in July. The probability is about 1.6 %.