Weather in Lewis County

Calculated from weather data of Chehalis-Centralia Airport (KCLS) between 2020 and 2024.

Maximum temperatures (°F)

Month	Average	2024	2023	2022	2021	2020
January	47.0	47.0	48.0	47.0	47.0	49.0
February	48.0	50.0	48.0	50.0	46.0	52.0
March	55.0	55.0	53.0	56.0	55.0	54.0
April	60.0		57.0	56.0	64.0	64.0
May	69.0		72.0	63.0	66.0	71.0
June	74.0		74.0	71.0	79.0	73.0
July	81.0		81.0	80.0	80.0	80.0
August	82.0		83.0	82.0	79.0	81.0
September	74.0		73.0	77.0	73.0	76.0
October	62.0		63.0	66.0	59.0	64.0
November	51.0		50.0	48.0	53.0	52.0
December	46.0		50.0	42.0	43.0	46.0
Average	61.0	51.0	63.0	62.0	62.0	63.0

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	37	38	37	38	42
February	36.0	39	35	36	37	36
March	37.0	38	36	41	36	36
April	41.0		41	39	39	40
May	47.0		48	44	45	48
June	51.0		49	52	52	52
July	54.0		52	57	55	53
August	55.0		56	60	54	54
September	52.0		50	53	51	54
October	42.0		46	33	44	46
November	39.0		37	34	43	40
December	37.0		40	35	36	37
Average	43.0	38.0	44.0	43.0	44.0	45.0

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	20	18	17	16
77 °F or warmer	0	76	59	62	63
68 °F or warmer	3	135	114	119	132
32 °F or colder	8	33	36	26	23

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	13.8	22	11	12	13	20
February	14.3	14	13	10	20	9
March	11.7	8	11	10	12	11
April	11.7		15	13	5	4
May	7.1		3	15	5	11
June	5.3		5	5	9	8
July	1.7		0	2	0	2
August	1.9		6	2	1	2
September	5.3		5	0	3	7
October	6.9		7	6	7	2
November	12.7		8	15	18	15
December	13.6		13	8	16	10
Average	9.1	14.5	7.6	8.7	8.2	7.9

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	5.9	6	5	6	6	8
February	5.7	6	6	5	6	5
March	5.6	6	6	5	5	6
April	5.8		6	6	4	5
May	4.4		4	5	5	5
June	4.4		5	4	5	5
July	3.9		4	3	4	4
August	4.2		4	4	5	4
September	4.4		5	4	5	4
October	5.0		5	4	6	5
November	5.4		4	5	7	6
December	5.3		4	5	6	5
Average	5.1	5.9	4.8	4.6	5.1	5.1

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	S	S	S	S
February	S	S	S	S	S
March	S	S	S	S	SW
April		S	SW	NW	SW
May		N	SW	SW	S
June		NW	S	N	SW
July		N	N	N	NW
August		N	N	W	NW
September		SW	N	S	NE
October		SE	S	S	S
November		S	S	S	S
December		S	S	S	S

Prevailing wind direction

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

Lewis County weather Q&A

What is the warmest month in Lewis County?

The warmest month is August with an average temperature of 82 °F over the past years.

What is the coldest month in Lewis County?

The coldest month is December with an average daytime temperature of 46 °F in the past few years.

Which month is the wettest in Lewis County?

Chance of precipitation is the highest in February with a probability of around 14.4 %.

Which month is the driest in Lewis County?

The least rainfall and snow can be expected in July. The probability is about 1.7 %.