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Longview, Washington climate

Csb Warm-summer Mediterranean

Longview has a seasonal cool-temperate climate (Warm-summer Mediterranean, Köppen Csb). The hottest month is August with an average daily high near 26°C, while the coldest is December averaging around 2°C at night. Precipitation totals about 597 mm a year and is strongly seasonal — December alone averages 97 mm while July barely receives 7 mm.

☀️ Summers

Warm

Highs near 26°C in August.

❄️ Winters

Chilly

Lows near 2°C in December.

🌧️ Rain

Moderate rainfall

About 597 mm of rain a year.

Wettest in December

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

Longview climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	8	11	14	16	20	22	26	26	24	17	11	8
Avg temp (°C)	5	6	9	11	14	17	20	20	17	12	8	5
Avg low (°C)	2	2	4	5	8	11	13	13	11	7	5	2
Precipitation (mm)	82	57	61	45	41	23	7	8	29	56	91	97

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	8	11	14	16	20	22
Avg temp (°C)	5	6	9	11	14	17
Avg low (°C)	2	2	4	5	8	11
Precipitation (mm)	82	57	61	45	41	23

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	26	26	24	17	11	8
Avg temp (°C)	20	20	17	12	8	5
Avg low (°C)	13	13	11	7	5	2
Precipitation (mm)	7	8	29	56	91	97

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	76	73	75	74	71	67	50	49	51	65	75	76
Relative humidity (%)	94	91	89	86	84	84	80	79	80	87	93	94
Wind speed (mph)	0.3	0.3	0.3	0.3	0.2	0.2	0.2	0.2	0.3	0.4	0.4	0.3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	76	73	75	74	71	67
Relative humidity (%)	94	91	89	86	84	84
Wind speed (mph)	0.3	0.3	0.3	0.3	0.2	0.2

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	50	49	51	65	75	76
Relative humidity (%)	80	79	80	87	93	94
Wind speed (mph)	0.2	0.2	0.3	0.4	0.4	0.3

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 25 years of daily observations at Kelso-longview Airport, a weather station, about 4 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →