Phoenix, AZ

Arizona · Records since 1895–2026

☀️ 100°F Feels like 108°
Currently in Phoenix
As of 11:15 AM MST

Records for September 11

🔥 Record High

112°F

September 11, 1990

+10° from 102° normal

❄ Record Low

58°F

September 11, 1912

-22° from 80° normal
🌞 Normal high: 102°F 🌑 Normal low: 80°F 1991–2020 normals

All-Time Records — Phoenix

🔥
122°F
Hottest Day Ever
Jun 26, 1990
❄
16°F
Coldest Day Ever
Jan 7, 1913
🌧
3.30"
Wettest Day Ever
Sep 8, 2014
☃
0.2"
Most Snow in One Day
Dec 22, 1990

First & Last Dates — Phoenix

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)
349 days
Longest growing season
1944
221 days
Shortest growing season
1897

Top 10 Record Highs — September 11

# Temp Date
🏆 112°F September 11, 1990
2 110°F September 11, 1971
3 109°F September 11, 2024
4 109°F September 11, 2001
5 109°F September 11, 1979
6 108°F September 11, 2021
7 108°F September 11, 2018
8 108°F September 11, 2017
9 108°F September 11, 2004
10 107°F September 11, 2007

Top 5 Record Lows — September 11

# Temp Date
🥶 58°F September 11, 1912
2 60°F September 11, 1920
3 65°F September 11, 1928
4 65°F September 11, 1925
5 65°F September 11, 1906
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 1895–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Phoenix

threshold: 110°F (90th percentile of historical Jun–Aug highs)
4.9
Avg heat wave length
days (historical)
114°
Avg peak temp
during heat waves
134
Dangerous nights 2026
Overnights ≥ 70°F
7
Heat waves 2026
so far

Days ≥ 90°F Per Year

1895–2026
167
2026 so far
164
Avg/year 1970–2025
181
Avg/year (last 10 complete)
196
Most in a year (1989)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Phoenix

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jun 30, 2023 – Jul 30, 2023 31 119°F (Jul 19) 115°F 91°F
2 Jun 12, 1974 – Jun 29, 1974 18 116°F (Jun 23) 113°F 80°F
3 Jul 25, 1995 – Aug 10, 1995 17 121°F (Jul 28) 114°F 87°F
4 Jul 27, 2025 – Aug 9, 2025 14 118°F (Aug 7) 113°F 89°F
5 Jul 2, 2024 – Jul 13, 2024 12 118°F (Jul 5) 115°F 92°F
6 Jun 26, 2007 – Jul 7, 2007 12 116°F (Jul 4) 112°F 86°F
7 Jul 17, 2024 – Jul 28, 2024 12 114°F (Jul 24) 112°F 89°F
8 Jun 17, 2017 – Jun 27, 2017 11 119°F (Jun 20) 114°F 87°F
9 Jul 4, 2020 – Jul 14, 2020 11 116°F (Jul 12) 112°F 89°F
10 Jun 14, 2008 – Jun 24, 2008 11 115°F (Jun 21) 112°F 84°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

65
2026 total
above-normal nights
35.4
Avg / summer
1970–2020
84
Most in a summer
2024

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 (1895–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1895, annual totals have trended -0.06" per decade, about -0.8" 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 Phoenix is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

1.73"
2026 YTD
Normal: 5.01"
-3.28"
0.00"
September so far
September normal: 0.57"
-0.57"
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 · Phoenix is 3.28" behind the normal pace

Period Review — Mar 1 – May 31, 2026

Any window, evaluated against every other year on record — 92 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
80.2°F
Average temperature
1st-warmest of 131
+6.5°
vs. average
Normal: 73.7°F (1991–2020)
0.06"
Precipitation
7th-driest of 130
-1.12"
vs. average
Normal: 1.18" · 5% of normal

Average Temperature by Year — Mar 1 – May 31

1896–2026 · 2026 highlighted · trend +0.68° per decade (warming since 1896)

Precipitation by Year — Mar 1 – May 31

1896–2026 · 2026 highlighted · trend -0.01" per decade (drier since 1896)

Warmest Mar 1 – May 31 on Record

# Year Avg Temp
1 2026 80.2°F
2 1989 77.7°F
3 2013 76.3°F
4 2004 76.1°F
5 1934 76.0°F
6 2017 75.9°F
7 2018 75.9°F
8 2022 75.7°F
9 2007 75.7°F
10 2014 75.7°F

Coolest Mar 1 – May 31 on Record

# Year Avg Temp
1 1917 63.1°F
2 1965 63.8°F
3 1964 65.1°F
4 1905 65.1°F
5 1912 65.2°F
6 1915 65.2°F
7 1922 65.5°F
8 1909 65.6°F
9 1913 65.9°F
10 1975 66.1°F

Wettest Mar 1 – May 31 on Record

# Year Total
1 1941 7.70"
2 1926 5.17"
3 1905 5.01"
4 1952 4.12"
5 1992 4.03"
6 1983 3.35"
7 1930 3.28"
8 1912 3.06"
9 2000 2.98"
10 1958 2.91"

Driest Mar 1 – May 31 on Record

# Year Total
1 1972 0.00"
2 1899 0.00"
3 1955 0.02"
4 1956 0.03"
5 2018 0.04"
6 1959 0.05"
7 2026 0.06"
8 1946 0.06"
9 2017 0.07"
10 1940 0.10"
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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