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Climate data for Seattle (SeaTac Airport), 1991–2020 normals,[a] extremes 1894–present[b]
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °F (°C) 67
(19) 		70
(21) 		79
(26) 		89
(32) 		93
(34) 		108
(42) 		103
(39) 		99
(37) 		98
(37) 		89
(32) 		74
(23) 		66
(19) 		108
(42)
Mean maximum °F (°C) 57.0
(13.9) 		59.1
(15.1) 		66.4
(19.1) 		74.3
(23.5) 		81.9
(27.7) 		85.8
(29.9) 		91.2
(32.9) 		89.9
(32.2) 		84.1
(28.9) 		72.0
(22.2) 		61.6
(16.4) 		56.8
(13.8) 		94.1
(34.5)
Mean daily maximum °F (°C) 48.0
(8.9) 		50.3
(10.2) 		54.2
(12.3) 		59.3
(15.2) 		66.3
(19.1) 		71.1
(21.7) 		77.4
(25.2) 		77.6
(25.3) 		71.6
(22.0) 		60.5
(15.8) 		52.1
(11.2) 		47.0
(8.3) 		61.3
(16.3)
Daily mean °F (°C) 42.8
(6.0) 		44.0
(6.7) 		47.1
(8.4) 		51.3
(10.7) 		57.5
(14.2) 		62.0
(16.7) 		67.1
(19.5) 		67.4
(19.7) 		62.6
(17.0) 		53.8
(12.1) 		46.5
(8.1) 		42.0
(5.6) 		53.7
(12.1)
Mean daily minimum °F (°C) 37.7
(3.2) 		37.7
(3.2) 		39.9
(4.4) 		43.3
(6.3) 		48.7
(9.3) 		53.0
(11.7) 		56.8
(13.8) 		57.2
(14.0) 		53.6
(12.0) 		47.0
(8.3) 		40.9
(4.9) 		37.1
(2.8) 		46.1
(7.8)
Mean minimum °F (°C) 26.1
(−3.3) 		27.3
(−2.6) 		31.3
(−0.4) 		35.6
(2.0) 		40.6
(4.8) 		46.6
(8.1) 		51.5
(10.8) 		51.7
(10.9) 		45.8
(7.7) 		36.8
(2.7) 		29.2
(−1.6) 		25.4
(−3.7) 		21.5
(−5.8)
Record low °F (°C) 0
(−18) 		1
(−17) 		11
(−12) 		29
(−2) 		28
(−2) 		38
(3) 		43
(6) 		44
(7) 		35
(2) 		28
(−2) 		6
(−14) 		6
(−14) 		0
(−18)
Average precipitation inches (mm) 5.78
(147) 		3.76
(96) 		4.17
(106) 		3.18
(81) 		1.88
(48) 		1.45
(37) 		0.60
(15) 		0.97
(25) 		1.61
(41) 		3.91
(99) 		6.31
(160) 		5.72
(145) 		39.34
(999)
Average snowfall inches (cm) 1.8
(4.6) 		2.2
(5.6) 		0.4
(1.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.2
(0.51) 		1.7
(4.3) 		6.3
(16)
Average precipitation days (≥ 0.01 in) 18.7 15.9 17.1 15.0 11.3 9.2 4.7 4.9 8.3 14.3 18.4 18.4 156.2
Average snowy days (≥ 0.1 in) 1.4 1.2 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 1.5 4.7
Average relative humidity (%) 78.0 75.2 73.6 71.4 68.9 67.1 65.4 68.2 73.2 78.6 79.8 80.1 73.3
Average dew point °F (°C) 33.1
(0.6) 		35.1
(1.7) 		36.3
(2.4) 		38.8
(3.8) 		43.5
(6.4) 		48.2
(9.0) 		51.4
(10.8) 		52.7
(11.5) 		50.2
(10.1) 		45.1
(7.3) 		38.8
(3.8) 		34.3
(1.3) 		42.3
(5.7)
Mean monthly sunshine hours 69.8 108.8 178.4 207.3 253.7 268.4 312.0 281.4 221.7 142.6 72.7 52.9 2,169.7
Percentage possible sunshine 25 38 48 51 54 56 65 64 59 42 26 20 49
Average ultraviolet index 0.8 1.5 2.8 4.5 6.0 6.9 7.3 6.2 4.4 2.3 1.1 0.7 3.7
Source 1: NOAA (relative humidity, dew point and sun 1961–1990)[1][2][3]
Source 2: UV Index Today (1995 to 2022)[4]

Notes

  1. ^ Mean monthly maxima and minima (i.e. the highest and lowest temperature readings during an entire month or year) calculated based on data at said location from 1991 to 2020.
  2. ^ Official records are restricted to SeaTac Airport from January 1945 onward.[1]

References

  1. ^ a b "NowData – NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved June 27, 2021.
  2. ^ "Summary of Monthly Normals 1991–2020". National Oceanic and Atmospheric Administration. Retrieved May 20, 2021.
  3. ^ "WMO Climate Normals for Seattle/Seattle–Tacoma INTL A, WA 1961–1990". National Oceanic and Atmospheric Administration. Archived from the original on 2023-06-27. Retrieved July 18, 2020.
  4. ^ "Historical UV Index Data - Seattle, WA". UV Index Today. Retrieved March 6, 2026.

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