Palmdale, CA

California · Records since 1931–2026

☀️ 93°F
Currently in Palmdale
As of 11:30 AM PDT

Records for September 11

🔥 Record High

105°F

September 11, 1993

+11° from 94° normal

❄ Record Low

39°F

September 11, 1952

-21° from 60° normal
🌞 Normal high: 94°F 🌑 Normal low: 60°F 1991–2020 normals

All-Time Records — Palmdale

🔥
118°F
Hottest Day Ever
Aug 5, 1990
❄
3°F
Coldest Day Ever
Jan 13, 1963
🌧
3.93"
Wettest Day Ever
Aug 20, 2023
☃
14.3"
Most Snow in One Day
Jan 4, 1974

First & Last Dates — Palmdale

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)
287 days
Longest growing season
2014
164 days
Shortest growing season
1974
239 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 105°F September 11, 1993
2 105°F September 11, 1948
3 105°F September 11, 1944
4 104°F September 11, 1971
5 104°F September 11, 1937
6 103°F September 11, 2009
7 103°F September 11, 1990
8 103°F September 11, 1983
9 103°F September 11, 1979
10 102°F September 11, 2015

Top 5 Record Lows — September 11

# Temp Date
🥶 39°F September 11, 1952
2 46°F September 11, 1931
3 47°F September 11, 1985
4 47°F September 11, 1954
5 48°F September 11, 1965
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 1931–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Palmdale

threshold: 104°F (90th percentile of historical Jun–Aug highs)
4.5
Avg heat wave length
days (historical)
108°
Avg peak temp
during heat waves
39
Dangerous nights 2026
Overnights ≥ 70°F
0
Heat waves 2026
so far

Days ≥ 90°F Per Year

1931–2026
92
2026 so far
106
Avg/year 1970–2025
114
Avg/year (last 10 complete)
140
Most in a year (2020)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Palmdale

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 2, 2024 – Jul 13, 2024 12 115°F (Jul 6) 110°F 73°F
2 Jul 8, 1961 – Jul 19, 1961 12 110°F (Jul 9) 108°F 70°F
3 Jul 30, 1969 – Aug 9, 1969 11 109°F (Aug 1) 106°F 68°F
4 Aug 7, 1996 – Aug 15, 1996 9 110°F (Aug 11) 107°F 70°F
5 Jul 9, 2003 – Jul 17, 2003 9 109°F (Jul 10) 107°F 66°F
6 Aug 6, 2012 – Aug 14, 2012 9 109°F (Aug 10) 106°F 73°F
7 Jun 17, 2017 – Jun 25, 2017 9 109°F (Jun 23) 107°F 72°F
8 Aug 9, 2002 – Aug 17, 2002 9 108°F (Aug 11) 107°F 70°F
9 Jul 21, 1980 – Jul 29, 1980 9 107°F (Jul 27) 106°F 71°F
10 Aug 14, 2020 – Aug 21, 2020 8 111°F (Aug 16) 108°F 73°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

62
2026 total
above-normal nights
37.0
Avg / summer
1970–2020
71
Most in a summer
2022

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 (1931–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1931, annual totals have trended -0.20" per decade, about -1.9" 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 Palmdale is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

3.03"
2026 YTD
Normal: 3.95"
-0.92"
0.00"
September so far
September normal: 0.16"
-0.16"
0
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Palmdale is 0.92" behind the normal pace

Period Review — Sep 1 – Sep 10, 2026

Any window, evaluated against every other year on record — 10 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
74.7°F
Average temperature
19th-coolest of 93
-4.5°
vs. average
Normal: 79.2°F (1991–2020)
0.00"
Precipitation
1st-driest of 96
-0.06"
vs. average
Normal: 0.06" · 0% of normal

Average Temperature by Year — Sep 1 – Sep 10

1932–2026 · 2026 highlighted · trend +0.45° per decade (warming since 1932)

Precipitation by Year — Sep 1 – Sep 10

1931–2026 · 2026 highlighted

Warmest Sep 1 – Sep 10 on Record

# Year Avg Temp
1 2022 88.1°F
2 2024 86.6°F
3 2013 83.9°F
4 1988 83.7°F
5 1995 83.5°F
6 2020 83.4°F
7 1955 83.2°F
8 1974 83.2°F
9 1934 82.9°F
10 1969 82.9°F

Coolest Sep 1 – Sep 10 on Record

# Year Avg Temp
1 1985 67.3°F
2 2000 68.7°F
3 1942 69.5°F
4 1965 70.2°F
5 1964 70.9°F
6 2005 72.1°F
7 1961 72.3°F
8 1946 72.6°F
9 1978 72.7°F
10 1940 72.7°F

Wettest Sep 1 – Sep 10 on Record

# Year Total
1 1976 1.89"
2 1978 0.92"
3 2011 0.85"
4 1958 0.81"
5 1963 0.58"
6 1945 0.42"
7 2017 0.39"
8 2022 0.26"
9 1998 0.24"
10 1997 0.18"

Driest Sep 1 – Sep 10 on Record

# Year Total
1 2026 0.00"
2 2025 0.00"
3 2024 0.00"
4 2023 0.00"
5 2021 0.00"
6 2020 0.00"
7 2019 0.00"
8 2018 0.00"
9 2016 0.00"
10 2015 0.00"
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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