Daily records
Page built 2026-10-19
Data as of 2026-10-17
Search
Built 2026-10-19 (19 October 2026)

Days at or above 40 C (104 F) in Los Angeles

Los Angeles has had days with a maximum temperature at or above 40 C (104 F) in 30 years, most in 1963 with 4. Days per year, season span, streaks and every date.

Key Facts for Los Angeles

  • Los Angeles has had days with a maximum temperature at or above 40 C (104 F) in 30 years, 49 days in all.
  • The most in one year was 4 days in 1963.
  • In 2026, the latest year on file, there were 3 such days.
  • The earliest first date in a year was 5 April 1989.
  • The latest last date in a year was 24 October 2017.
  • The longest run inside a single year was 4 days in 1963.
  • 5 years with under 90 percent of days observed are left out of these rankings.

Days per Year

30 years, 49 days
Days at or above 40 C (104 F) per year in Los Angeles Days per year in Los Angeles with a maximum temperature at or above 40 C (104 F). The line is the decade average. The most was 4 in 1963. Grey bars are years with under 90 percent of days observed, left out of rankings. 012341913: 11939: 31950: 11955: 21957: 11958: 11963: 41970: 11971: 11973: 21978: 31979: 11981: 21983: 11984: 11985: 11987: 21988: 11989: 21990: 21991: 11994: 11998: 12010: 22016: 12017: 12018: 22020: 12024: 32026: 3191319781991
Days per year in Los Angeles with a maximum temperature at or above 40 C (104 F). The line is the decade average. The most was 4 in 1963. Grey bars are years with under 90 percent of days observed, left out of rankings.
Days at or above 40 C (104 F) per year in Los Angeles
YearDaysDecade average
191311
193933
195011.3
195521.3
195711.3
195811.3
196344
197011.6
197111.6
197321.6
197831.6
197911.6
198121.4
198311.4
198411.4
198511.4
198721.4
198811.4
198921.4
199021.3
199111.3
199411.3
199811.3
201021.5
201611.5
201711.5
201821.5
202012.3
202432.3
202632.3

Season Span

earliest 5 April, latest 24 October
First to last qualifying date each year in Los Angeles For each year, a bar from the first to the last day in Los Angeles meeting 40 C (104 F). Long bars mean a long season. 1913: 17 September 1913 to 17 September 19131939: 19 September 1939 to 21 September 19391950: 13 October 1950 to 13 October 19501955: 1 September 1955 to 2 September 19551957: 18 June 1957 to 18 June 19571958: 16 October 1958 to 16 October 19581963: 25 September 1963 to 28 September 19631970: 27 September 1970 to 27 September 19701971: 13 September 1971 to 13 September 19711973: 20 June 1973 to 21 June 19731978: 23 September 1978 to 25 September 19781979: 11 June 1979 to 11 June 19791981: 16 June 1981 to 17 June 19811983: 6 August 1983 to 6 August 19831984: 5 September 1984 to 5 September 19841985: 1 July 1985 to 1 July 19851987: 3 October 1987 to 4 October 19871988: 4 September 1988 to 4 September 19881989: 5 April 1989 to 6 April 19891990: 26 June 1990 to 27 June 19901991: 10 October 1991 to 10 October 19911994: 12 August 1994 to 12 August 19941998: 1 September 1998 to 1 September 19982010: 26 September 2010 to 27 September 20102016: 26 September 2016 to 26 September 20162017: 24 October 2017 to 24 October 20172018: 6 July 2018 to 7 July 20182020: 6 September 2020 to 6 September 20202024: 6 September 2024 to 9 September 20242026: 9 September 2026 to 5 October 202619131957197119811987199120162024JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day in Los Angeles meeting 40 C (104 F). Long bars mean a long season.
First to last qualifying date each year in Los Angeles
YearFirst dateLast date
19131913-09-171913-09-17
19391939-09-191939-09-21
19501950-10-131950-10-13
19551955-09-011955-09-02
19571957-06-181957-06-18
19581958-10-161958-10-16
19631963-09-251963-09-28
19701970-09-271970-09-27
19711971-09-131971-09-13
19731973-06-201973-06-21
19781978-09-231978-09-25
19791979-06-111979-06-11
19811981-06-161981-06-17
19831983-08-061983-08-06
19841984-09-051984-09-05
19851985-07-011985-07-01
19871987-10-031987-10-04
19881988-09-041988-09-04
19891989-04-051989-04-06
19901990-06-261990-06-27
19911991-10-101991-10-10
19941994-08-121994-08-12
19981998-09-011998-09-01
20102010-09-262010-09-27
20162016-09-262016-09-26
20172017-10-242017-10-24
20182018-07-062018-07-07
20202020-09-062020-09-06
20242024-09-062024-09-09
20262026-09-092026-10-05

Every Year

Days at or above 40 C (104 F) per year in Los Angeles
YearDaysFirst dateLast dateLongest streak in yearCoverage
202639 September 20265 October 20261 daysIncomplete, not ranked
202436 September 20249 September 20242 daysComplete
202016 September 20206 September 20201 daysComplete
201826 July 20187 July 20182 daysComplete
2017124 October 201724 October 20171 daysComplete
2016126 September 201626 September 20161 daysComplete
2010226 September 201027 September 20102 daysComplete
199811 September 19981 September 19981 daysComplete
1994112 August 199412 August 19941 daysComplete
1991110 October 199110 October 19911 daysComplete
1990226 June 199027 June 19902 daysComplete
198925 April 19896 April 19892 daysComplete
198814 September 19884 September 19881 daysComplete
198723 October 19874 October 19872 daysComplete
198511 July 19851 July 19851 daysComplete
198415 September 19845 September 19841 daysComplete
198316 August 19836 August 19831 daysComplete
1981216 June 198117 June 19812 daysComplete
1979111 June 197911 June 19791 daysComplete
1978323 September 197825 September 19783 daysComplete
1973220 June 197321 June 19732 daysComplete
1971113 September 197113 September 19711 daysComplete
1970127 September 197027 September 19701 daysComplete
1963425 September 196328 September 19634 daysComplete
1958116 October 195816 October 19581 daysComplete
1957118 June 195718 June 19571 daysComplete
195521 September 19552 September 19552 daysComplete
1950113 October 195013 October 19501 daysComplete
1939319 September 193921 September 19393 daysComplete
1913117 September 191317 September 19131 daysComplete
Decade averages for Days at or above 40 C (104 F) in Los Angeles
DecadeAverage days per yearYears counted
1910s1.01
1930s3.01
1950s1.34
1960s4.01
1970s1.65
1980s1.47
1990s1.34
2010s1.54
2020s2.02

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 40 C (104 F) in Los Angeles, 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).