Los Angeles Downtown, CA

California · Records since 1877–2026

☀️ 87°F Feels like 96°
Currently in Los Angeles Downtown
As of 11:30 AM PDT

Records for September 11

🔥 Record High

101°F

September 11, 1983

+17° from 84° normal

❄ Record Low

48°F

September 11, 1901

-17° from 65° normal
🌞 Normal high: 84°F 🌑 Normal low: 65°F 1991–2020 normals

All-Time Records — Los Angeles Downtown

🔥
113°F
Hottest Day Ever
Sep 27, 2010
❄
28°F
Coldest Day Ever
Jan 4, 1949
🌧
5.88"
Wettest Day Ever
Mar 2, 1938
☃
2.0"
Most Snow in One Day
Jan 15, 1932

First & Last Dates — Los Angeles Downtown

How early and how late each seasonal turning point has ever arrived, across the full period of record

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Range ever recorded Normal date (1991–2020)

Top 10 Record Highs — September 11

# Temp Date
🏆 101°F September 11, 1983
2 101°F September 11, 1878
3 100°F September 11, 1959
4 100°F September 11, 1948
5 99°F September 11, 1918
6 98°F September 11, 1963
7 97°F September 11, 1990
8 97°F September 11, 1971
9 96°F September 11, 1898
10 95°F September 11, 2015

Top 5 Record Lows — September 11

# Temp Date
🥶 48°F September 11, 1901
2 51°F September 11, 1900
3 51°F September 11, 1886
4 52°F September 11, 1892
5 53°F September 11, 1924
About this data — Records are sourced from the NOAA Threadex dataset via RCC ACIS, a quality-controlled record for long-term climate stations. Threadex adjusts for station relocations and observation-time changes, making records comparable across all years since 1877–2026. Climate normals represent the 1991–2020 average.
4
days
🔥 Heat Wave in Progress
4 consecutive days at or above 89°F · since September 7
Heat wave in progress (3+ days ≥ 89°F)

Heat Wave Summary — Los Angeles Downtown

threshold: 89°F (90th percentile of historical Jun–Aug highs)
4.5
Avg heat wave length
days (historical)
97°
Avg peak temp
during heat waves
14
Dangerous nights 2026
Overnights ≥ 70°F
7
Heat waves 2026
so far

Days ≥ 90°F Per Year

1877–2026
43
2026 so far
20
Avg/year 1970–2025
25
Avg/year (last 10 complete)
47
Most in a year (1983)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Los Angeles Downtown

# Dates Days Peak Avg High Avg Overnight Low
🏆 Aug 25, 1995 – Sep 7, 1995 14 100°F (Sep 5) 95°F 71°F
2 Aug 17, 2026 – Aug 30, 2026 14 98°F (Aug 23) 95°F 70°F
3 Jul 29, 1971 – Aug 11, 1971 14 97°F (Aug 6) 93°F 72°F
4 Aug 5, 1983 – Aug 17, 1983 13 105°F (Aug 6) 95°F 74°F
5 Aug 25, 2009 – Sep 5, 2009 12 101°F (Aug 27) 95°F 68°F
6 Jul 7, 1984 – Jul 18, 1984 12 98°F (Jul 14) 93°F 72°F
7 Aug 1, 2018 – Aug 11, 2018 11 98°F (Aug 8) 92°F 71°F
8 Jul 18, 1891 – Jul 27, 1891 10 109°F (Jul 25) 95°F 65°F
9 Sep 20, 1978 – Sep 29, 1978 10 107°F (Sep 25) 99°F 70°F
10 Aug 9, 1994 – Aug 18, 1994 10 104°F (Aug 12) 96°F 75°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

Nights where the overnight low exceeded the 1991–2020 normal low

58
2026 total
above-normal nights
44.9
Avg / summer
1970–2020
89
Most in a summer
1984

Above-Normal Summer Nights Per Year

Average June–August Low by Decade

Overnight lows · complete decades only

Precipitation

Annual totals and trend across the full period of record · see this year's standing →

Monthly Precipitation — Last 24 Months

Blue = actual · dashed line = monthly normal

Annual Precipitation Per Year (1877–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1877, annual totals have trended -0.07" per decade, about -1.1" across the record.

Heavy Rain Days Per Year (≥ 1.0")

Compare year-to-year changes in days with heavy rainfall (≥ 1.0")

This Year — 2026

How Los Angeles Downtown is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

188 of 253 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

8.09"
2026 YTD
Normal: 10.31"
-2.22"
0.75"
September so far
September normal: 0.13"
+0.62"
2
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Los Angeles Downtown is 2.22" behind the normal pace

Period Review — Aug 11 – Sep 10, 2026

Any window, evaluated against every other year on record — 31 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
79.5°F
Average temperature
6th-warmest of 150
+3.8°
vs. average
Normal: 75.7°F (1991–2020)

Average Temperature by Year — Aug 11 – Sep 10

1877–2026 · 2026 highlighted · trend +0.47° per decade (warming since 1877)

Precipitation by Year — Aug 11 – Sep 10

1877–2025 · 2026 highlighted · trend +0.01" per decade (wetter since 1877)

Warmest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1983 80.5°F
2 1998 80.1°F
3 1994 80.1°F
4 1967 79.9°F
5 1984 79.6°F
6 2026 79.5°F
7 1995 78.7°F
8 2015 78.5°F
9 1997 78.2°F
10 1996 78.1°F

Coolest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1916 67.0°F
2 1900 67.2°F
3 1895 67.3°F
4 1914 67.5°F
5 1880 68.2°F
6 1912 68.3°F
7 1899 68.7°F
8 1907 68.7°F
9 1901 68.8°F
10 1902 68.8°F
About this data. Pick any start and end date and this becomes the same kind of review as the Month and Fall tabs, just for exactly the window you asked for — the generalized version of the same engine, evaluated across every year on record. Average temperature is the mean of each day's (high + low) / 2; precipitation is the sum of daily totals. A year missing more than about a fifth of the window's days is excluded from the temperature ranking; any missing day excludes a year from the precipitation ranking, since an unreported day is unreported rain. Ranges that cross from December into January aren't supported yet. Normals are the 1991–2020 mean for the same window.
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