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Built 2026-10-19 (19 October 2026)

Days at or above 30 C (86 F) in Seattle

Seattle has had days with a maximum temperature at or above 30 C (86 F) in 77 years, most in 2018 with 24. Days per year, season span, streaks and every date.

Key Facts for Seattle

  • Seattle has had days with a maximum temperature at or above 30 C (86 F) in 77 years, 733 days in all.
  • The most in one year was 24 days in 2018.
  • In 2026, the latest year on file, there were 12 such days.
  • The earliest first date in a year was 18 April 2016.
  • The latest last date in a year was 16 October 2022.
  • The longest run inside a single year was 8 days in 1967.
  • 1 year with under 90 percent of days observed is left out of these rankings.

Days per Year

77 years, 733 days
Days at or above 30 C (86 F) per year in Seattle Days per year in Seattle with a maximum temperature at or above 30 C (86 F). The line is the decade average. The most was 24 in 2018. Grey bars are years with under 90 percent of days observed, left out of rankings. 01020301948: 31949: 41950: 31951: 71952: 91953: 31955: 31956: 71958: 161959: 91960: 121961: 141962: 41963: 71964: 11965: 101966: 31967: 201968: 91969: 41970: 51971: 121972: 91973: 61974: 151975: 91976: 31977: 151978: 111979: 81980: 11981: 121982: 81983: 11984: 41985: 141986: 101987: 101988: 121989: 31990: 141991: 61992: 141993: 31994: 71995: 71996: 141997: 51998: 91999: 22000: 22001: 32002: 62003: 122004: 82005: 102006: 142007: 52008: 92009: 202010: 102011: 12012: 82013: 152014: 172015: 232016: 142017: 202018: 242019: 82020: 122021: 142022: 202023: 172024: 152025: 172026: 1219481960197019801990200020102020
Days per year in Seattle with a maximum temperature at or above 30 C (86 F). The line is the decade average. The most was 24 in 2018. Grey bars are years with under 90 percent of days observed, left out of rankings.
Days at or above 30 C (86 F) per year in Seattle
YearDaysDecade average
194833.5
194943.5
195037.1
195177.1
195297.1
195337.1
195537.1
195677.1
1958167.1
195997.1
1960128.4
1961148.4
196248.4
196378.4
196418.4
1965108.4
196638.4
1967208.4
196898.4
196948.4
197059.3
1971129.3
197299.3
197369.3
1974159.3
197599.3
197639.3
1977159.3
1978119.3
197989.3
198017.5
1981127.5
198287.5
198317.5
198447.5
1985147.5
1986107.5
1987107.5
1988127.5
198937.5
1990148.1
199168.1
1992148.1
199338.1
199478.1
199578.1
1996148.1
199758.1
199898.1
199928.1
200028.9
200138.9
200268.9
2003128.9
200488.9
2005108.9
2006148.9
200758.9
200898.9
2009208.9
20101014
2011114
2012814
20131514
20141714
20152314
20161414
20172014
20182414
2019814
20201215.3
20211415.3
20222015.3
20231715.3
20241515.3
20251715.3
20261215.3

Season Span

earliest 18 April, latest 16 October
First to last qualifying date each year in Seattle For each year, a bar from the first to the last day in Seattle meeting 30 C (86 F). Long bars mean a long season. 1948: 7 June 1948 to 31 July 19481949: 13 July 1949 to 6 September 19491950: 21 July 1950 to 21 September 19501951: 28 June 1951 to 15 September 19511952: 8 July 1952 to 21 September 19521953: 5 May 1953 to 5 September 19531955: 9 June 1955 to 5 September 19551956: 30 May 1956 to 6 September 19561958: 18 May 1958 to 7 September 19581959: 9 July 1959 to 31 July 19591960: 5 July 1960 to 9 August 19601961: 15 June 1961 to 13 September 19611962: 23 July 1962 to 28 July 19621963: 18 May 1963 to 9 September 19631964: 31 May 1964 to 31 May 19641965: 30 June 1965 to 18 August 19651966: 15 June 1966 to 21 August 19661967: 19 June 1967 to 27 September 19671968: 25 June 1968 to 10 August 19681969: 22 May 1969 to 17 June 19691970: 1 June 1970 to 15 July 19701971: 11 May 1971 to 11 August 19711972: 27 May 1972 to 8 August 19721973: 14 May 1973 to 5 September 19731974: 29 June 1974 to 24 September 19741975: 1 June 1975 to 22 September 19751976: 18 June 1976 to 20 September 19761977: 17 June 1977 to 17 August 19771978: 2 June 1978 to 8 August 19781979: 2 June 1979 to 14 September 19791980: 10 August 1980 to 10 August 19801981: 26 July 1981 to 15 September 19811982: 18 June 1982 to 2 September 19821983: 28 May 1983 to 28 May 19831984: 16 July 1984 to 14 September 19841985: 18 June 1985 to 23 August 19851986: 31 May 1986 to 6 September 19861987: 26 June 1987 to 1 October 19871988: 14 June 1988 to 3 September 19881989: 4 June 1989 to 22 September 19891990: 11 July 1990 to 22 September 19901991: 2 July 1991 to 21 August 19911992: 24 May 1992 to 17 August 19921993: 3 August 1993 to 5 August 19931994: 19 July 1994 to 22 September 19941995: 28 June 1995 to 19 July 19951996: 12 July 1996 to 29 August 19961997: 4 July 1997 to 17 August 19971998: 16 July 1998 to 1 September 19981999: 9 July 1999 to 13 September 19992000: 27 June 2000 to 28 June 20002001: 9 August 2001 to 12 August 20012002: 13 June 2002 to 28 August 20022003: 5 June 2003 to 4 September 20032004: 18 June 2004 to 9 August 20042005: 26 May 2005 to 15 August 20052006: 25 June 2006 to 2 September 20062007: 30 May 2007 to 29 August 20072008: 17 May 2008 to 16 August 20082009: 2 June 2009 to 22 September 20092010: 7 July 2010 to 25 August 20102011: 21 August 2011 to 21 August 20112012: 4 August 2012 to 7 September 20122013: 6 May 2013 to 11 September 20132014: 1 July 2014 to 15 September 20142015: 7 June 2015 to 19 August 20152016: 18 April 2016 to 26 August 20162017: 27 May 2017 to 28 September 20172018: 14 May 2018 to 22 August 20182019: 10 May 2019 to 28 August 20192020: 9 May 2020 to 10 September 20202021: 1 June 2021 to 13 August 20212022: 25 June 2022 to 16 October 20222023: 13 May 2023 to 2 September 20232024: 21 June 2024 to 6 September 20242025: 8 June 2025 to 16 September 20252026: 2 June 2026 to 20 August 202619481960197019801990200020102020JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day in Seattle meeting 30 C (86 F). Long bars mean a long season.
First to last qualifying date each year in Seattle
YearFirst dateLast date
19481948-06-071948-07-31
19491949-07-131949-09-06
19501950-07-211950-09-21
19511951-06-281951-09-15
19521952-07-081952-09-21
19531953-05-051953-09-05
19551955-06-091955-09-05
19561956-05-301956-09-06
19581958-05-181958-09-07
19591959-07-091959-07-31
19601960-07-051960-08-09
19611961-06-151961-09-13
19621962-07-231962-07-28
19631963-05-181963-09-09
19641964-05-311964-05-31
19651965-06-301965-08-18
19661966-06-151966-08-21
19671967-06-191967-09-27
19681968-06-251968-08-10
19691969-05-221969-06-17
19701970-06-011970-07-15
19711971-05-111971-08-11
19721972-05-271972-08-08
19731973-05-141973-09-05
19741974-06-291974-09-24
19751975-06-011975-09-22
19761976-06-181976-09-20
19771977-06-171977-08-17
19781978-06-021978-08-08
19791979-06-021979-09-14
19801980-08-101980-08-10
19811981-07-261981-09-15
19821982-06-181982-09-02
19831983-05-281983-05-28
19841984-07-161984-09-14
19851985-06-181985-08-23
19861986-05-311986-09-06
19871987-06-261987-10-01
19881988-06-141988-09-03
19891989-06-041989-09-22
19901990-07-111990-09-22
19911991-07-021991-08-21
19921992-05-241992-08-17
19931993-08-031993-08-05
19941994-07-191994-09-22
19951995-06-281995-07-19
19961996-07-121996-08-29
19971997-07-041997-08-17
19981998-07-161998-09-01
19991999-07-091999-09-13
20002000-06-272000-06-28
20012001-08-092001-08-12
20022002-06-132002-08-28
20032003-06-052003-09-04
20042004-06-182004-08-09
20052005-05-262005-08-15
20062006-06-252006-09-02
20072007-05-302007-08-29
20082008-05-172008-08-16
20092009-06-022009-09-22
20102010-07-072010-08-25
20112011-08-212011-08-21
20122012-08-042012-09-07
20132013-05-062013-09-11
20142014-07-012014-09-15
20152015-06-072015-08-19
20162016-04-182016-08-26
20172017-05-272017-09-28
20182018-05-142018-08-22
20192019-05-102019-08-28
20202020-05-092020-09-10
20212021-06-012021-08-13
20222022-06-252022-10-16
20232023-05-132023-09-02
20242024-06-212024-09-06
20252025-06-082025-09-16
20262026-06-022026-08-20

Every Year

Days at or above 30 C (86 F) per year in Seattle
YearDaysFirst dateLast dateLongest streak in yearCoverage
2026122 June 202620 August 20263 daysIncomplete, not ranked
2025178 June 202516 September 20255 daysComplete
20241521 June 20246 September 20246 daysComplete
20231713 May 20232 September 20235 daysComplete
20222025 June 202216 October 20227 daysComplete
2021141 June 202113 August 20214 daysComplete
2020129 May 202010 September 20203 daysComplete
2019810 May 201928 August 20192 daysComplete
20182414 May 201822 August 20186 daysComplete
20172027 May 201728 September 20174 daysComplete
20161418 April 201626 August 20163 daysComplete
2015237 June 201519 August 20156 daysComplete
2014171 July 201415 September 20142 daysComplete
2013156 May 201311 September 20134 daysComplete
201284 August 20127 September 20123 daysComplete
2011121 August 201121 August 20111 daysComplete
2010107 July 201025 August 20105 daysComplete
2009202 June 200922 September 20096 daysComplete
2008917 May 200816 August 20083 daysComplete
2007530 May 200729 August 20072 daysComplete
20061425 June 20062 September 20064 daysComplete
20051026 May 200515 August 20053 daysComplete
2004818 June 20049 August 20044 daysComplete
2003125 June 20034 September 20033 daysComplete
2002613 June 200228 August 20022 daysComplete
200139 August 200112 August 20012 daysComplete
2000227 June 200028 June 20002 daysComplete
199929 July 199913 September 19991 daysComplete
1998916 July 19981 September 19984 daysComplete
199754 July 199717 August 19973 daysComplete
19961412 July 199629 August 19965 daysComplete
1995728 June 199519 July 19954 daysComplete
1994719 July 199422 September 19945 daysComplete
199333 August 19935 August 19933 daysComplete
19921424 May 199217 August 19925 daysComplete
199162 July 199121 August 19912 daysComplete
19901411 July 199022 September 19904 daysComplete
198934 June 198922 September 19891 daysComplete
19881214 June 19883 September 19883 daysComplete
19871026 June 19871 October 19873 daysComplete
19861031 May 19866 September 19863 daysComplete
19851418 June 198523 August 19853 daysComplete
1984416 July 198414 September 19842 daysComplete
1983128 May 198328 May 19831 daysComplete
1982818 June 19822 September 19822 daysComplete
19811226 July 198115 September 19817 daysComplete
1980110 August 198010 August 19801 daysComplete
197982 June 197914 September 19795 daysComplete
1978112 June 19788 August 19784 daysComplete
19771517 June 197717 August 19775 daysComplete
1976318 June 197620 September 19761 daysComplete
197591 June 197522 September 19752 daysComplete
19741529 June 197424 September 19746 daysComplete
1973614 May 19735 September 19732 daysComplete
1972927 May 19728 August 19724 daysComplete
19711211 May 197111 August 19714 daysComplete
197051 June 197015 July 19702 daysComplete
1969422 May 196917 June 19692 daysComplete
1968925 June 196810 August 19683 daysComplete
19672019 June 196727 September 19678 daysComplete
1966315 June 196621 August 19662 daysComplete
19651030 June 196518 August 19654 daysComplete
1964131 May 196431 May 19641 daysComplete
1963718 May 19639 September 19634 daysComplete
1962423 July 196228 July 19623 daysComplete
19611415 June 196113 September 19614 daysComplete
1960125 July 19609 August 19604 daysComplete
195999 July 195931 July 19596 daysComplete
19581618 May 19587 September 19583 daysComplete
1956730 May 19566 September 19562 daysComplete
195539 June 19555 September 19551 daysComplete
195335 May 19535 September 19531 daysComplete
195298 July 195221 September 19523 daysComplete
1951728 June 195115 September 19513 daysComplete
1950321 July 195021 September 19501 daysComplete
1949413 July 19496 September 19492 daysComplete
194837 June 194831 July 19482 daysComplete
Decade averages for Days at or above 30 C (86 F) in Seattle
DecadeAverage days per yearYears counted
1940s3.52
1950s7.18
1960s8.410
1970s9.310
1980s7.510
1990s8.110
2000s8.910
2010s14.010
2020s15.86

Compare with your own threshold in the threshold explorer. Fahrenheit thresholds are converted to tenths of a degree Celsius once, rounding half up.

Download the Data

  • Data for Days at or above 30 C (86 F) in Seattle, by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Threshold counts are computed by this site from the threaded city record.

Data as of . Last revised (2026-10-17).