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Burien, Washington climate

Csb Warm-summer Mediterranean

Burien has a seasonal cool-temperate climate (Warm-summer Mediterranean, Köppen Csb). The hottest month is August with an average daily high near 78°F, while the coldest is December averaging around 37°F at night. Precipitation totals about 39 inches a year and is strongly seasonal — November alone averages 6.3 inches while July barely receives 0.60 inches. Light snow accumulates each winter (6 inches of snow per year on average).

☀️ Summers

Mild

Highs near 78°F in August.

About 4 days a year above 90 °F

❄️ Winters

Chilly

Lows near 37°F in December.

About 25 freezing nights a year

🌧️ Rain & snow

Moderate rainfall

About 39 in of rain a year, plus 6 in of snow.

Snow falls through the winter months

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

+1.4 °F vs 50 years ago

Temperature & precipitation

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

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Burien climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	48	50	54	59	66	71	77	78	72	61	52	47
Avg temp (°F)	43	44	47	51	58	62	67	67	63	54	47	42
Avg low (°F)	38	38	40	43	49	53	57	57	54	47	41	37
Precipitation (in)	5.8	3.8	4.2	3.2	1.9	1.5	0.6	1.0	1.6	3.9	6.3	5.7
Snowfall (in)	1.8	2.2	0.4	—	—	—	—	—	—	—	0.2	1.7

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	48	50	54	59	66	71
Avg temp (°F)	43	44	47	51	58	62
Avg low (°F)	38	38	40	43	49	53
Precipitation (in)	5.8	3.8	4.2	3.2	1.9	1.5
Snowfall (in)	1.8	2.2	0.4	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	77	78	72	61	52	47
Avg temp (°F)	67	67	63	54	47	42
Avg low (°F)	57	57	54	47	41	37
Precipitation (in)	0.6	1.0	1.6	3.9	6.3	5.7
Snowfall (in)	—	—	—	—	0.2	1.7

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	19	16	17	15	11	9	5	5	8	14	18	18
Days with high ≥ 90°F (days)	—	—	—	—	0.0	0.6	2	1	0.2	—	—	—
Days with low ≤ 32°F (days)	7	6	2	0.1	—	—	—	—	—	0.2	3	7
Days with snowfall ≥ 1 in (days)	0.3	0.4	0.1	—	—	—	—	—	—	—	0.0	0.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	19	16	17	15	11	9
Days with high ≥ 90°F (days)	—	—	—	—	0.0	0.6
Days with low ≤ 32°F (days)	7	6	2	0.1	—	—
Days with snowfall ≥ 1 in (days)	0.3	0.4	0.1	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	5	5	8	14	18	18
Days with high ≥ 90°F (days)	2	1	0.2	—	—	—
Days with low ≤ 32°F (days)	—	—	—	0.2	3	7
Days with snowfall ≥ 1 in (days)	—	—	—	—	0.0	0.4

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	76	72	74	73	69	66	48	48	51	66	75	75
Clear days (≤ 30% cloud)	3	4	3	3	4	4	11	11	10	5	3	2
Partly cloudy days (30–70%)	7	7	6	8	8	9	10	10	9	9	6	7
Cloudy days (≥ 70%)	22	18	22	19	19	17	10	10	11	17	21	21
Relative humidity (%)	90	87	85	82	80	80	78	76	77	83	89	90
Wind speed (mph)	1.9	1.8	1.9	1.7	1.4	1.3	1.2	1.2	1.4	1.7	1.9	1.9

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	76	72	74	73	69	66
Clear days (≤ 30% cloud)	3	4	3	3	4	4
Partly cloudy days (30–70%)	7	7	6	8	8	9
Cloudy days (≥ 70%)	22	18	22	19	19	17
Relative humidity (%)	90	87	85	82	80	80
Wind speed (mph)	1.9	1.8	1.9	1.7	1.4	1.3

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	48	48	51	66	75	75
Clear days (≤ 30% cloud)	11	11	10	5	3	2
Partly cloudy days (30–70%)	10	10	9	9	6	7
Cloudy days (≥ 70%)	10	10	11	17	21	21
Relative humidity (%)	78	76	77	83	89	90
Wind speed (mph)	1.2	1.2	1.4	1.7	1.9	1.9

30-year delta table (1991–2020 minus 1981–2010, °F)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Δ Max temp	+0.8	+0.4	+0.5	+0.8	+1.6	+1.2	+1.6	+1.3	+1.1	+0.8	+1.2	+1.3
Δ Avg temp	+0.8	+0.6	+0.6	+1.0	+1.5	+1.1	+1.4	+1.3	+1.3	+1.0	+1.1	+1.4
Δ Min temp	+0.8	+0.8	+0.6	+1.1	+1.4	+1.1	+1.2	+1.3	+1.5	+1.2	+0.9	+1.5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Δ Max temp	+0.8	+0.4	+0.5	+0.8	+1.6	+1.2
Δ Avg temp	+0.8	+0.6	+0.6	+1.0	+1.5	+1.1
Δ Min temp	+0.8	+0.8	+0.6	+1.1	+1.4	+1.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Δ Max temp	+1.6	+1.3	+1.1	+0.8	+1.2	+1.3
Δ Avg temp	+1.4	+1.3	+1.3	+1.0	+1.1	+1.4
Δ Min temp	+1.2	+1.3	+1.5	+1.2	+0.9	+1.5

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Seattle Tacoma AP (NOAA GHCN station USW00024233), about 4 km from the city centre.

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 →