Tucson, AZ

Arizona · Records since 1894–2026

☀️ 96°F Feels like 100°
Currently in Tucson
As of 11:30 AM MST

Records for September 11

🔥 Record High

107°F

September 11, 1990

+11° from 96° normal

❄ Record Low

55°F

September 11, 1928

-17° from 72° normal
🌞 Normal high: 96°F 🌑 Normal low: 72°F 1991–2020 normals

All-Time Records — Tucson

🔥
117°F
Hottest Day Ever
Jun 26, 1990
❄
6°F
Coldest Day Ever
Jan 7, 1913
🌧
3.93"
Wettest Day Ever
Jul 29, 1958
☃
6.8"
Most Snow in One Day
Dec 8, 1971

First & Last Dates — Tucson

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)
351 days
Longest growing season
2014
165 days
Shortest growing season
1899
296 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 107°F September 11, 1990
2 104°F September 11, 2024
3 104°F September 11, 1943
4 103°F September 11, 2023
5 103°F September 11, 2021
6 103°F September 11, 2017
7 103°F September 11, 1992
8 103°F September 11, 1955
9 102°F September 11, 2018
10 102°F September 11, 2004

Top 5 Record Lows — September 11

# Temp Date
🥶 55°F September 11, 1928
2 55°F September 11, 1920
3 56°F September 11, 1912
4 58°F September 11, 1982
5 59°F September 11, 1925
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 1894–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Tucson

threshold: 106°F (90th percentile of historical Jun–Aug highs)
4.9
Avg heat wave length
days (historical)
109°
Avg peak temp
during heat waves
98
Dangerous nights 2026
Overnights ≥ 70°F
4
Heat waves 2026
so far

Days ≥ 90°F Per Year

1894–2026
143
2026 so far
146
Avg/year 1970–2025
168
Avg/year (last 10 complete)
190
Most in a year (2017)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Tucson

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 13, 2023 – Jul 30, 2023 18 112°F (Jul 18) 110°F 81°F
2 Jul 24, 1995 – Aug 9, 1995 17 114°F (Jul 28) 108°F 78°F
3 Aug 8, 2020 – Aug 20, 2020 13 111°F (Aug 13) 108°F 80°F
4 Jun 23, 1994 – Jul 4, 1994 12 116°F (Jun 29) 111°F 80°F
5 Jul 2, 2024 – Jul 13, 2024 12 112°F (Jul 8) 109°F 80°F
6 Jun 27, 2005 – Jul 8, 2005 12 110°F (Jul 5) 107°F 76°F
7 Jun 18, 1990 – Jun 28, 1990 11 117°F (Jun 26) 111°F 77°F
8 Jun 18, 2017 – Jun 28, 2017 11 116°F (Jun 20) 111°F 82°F
9 Jun 14, 2008 – Jun 24, 2008 11 111°F (Jun 21) 108°F 75°F
10 Jun 26, 2007 – Jul 6, 2007 11 110°F (Jul 4) 108°F 78°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

56
2026 total
above-normal nights
28.6
Avg / summer
1970–2020
68
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 (1894–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1894, annual totals have trended -0.02" per decade, about -0.2" 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 Tucson is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

7.49"
2026 YTD
Normal: 7.67"
-0.18"
0.02"
September so far
September normal: 1.32"
-1.30"
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 · Tucson is 0.18" 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)
86.1°F
Average temperature
18th-warmest of 132
+1.7°
vs. average
Normal: 84.4°F (1991–2020)
0.02"
Precipitation
33rd-driest of 132
-0.64"
vs. average
Normal: 0.66" · 3% of normal

Average Temperature by Year — Sep 1 – Sep 10

1894–2026 · 2026 highlighted · trend +0.34° per decade (warming since 1894)

Precipitation by Year — Sep 1 – Sep 10

1894–2026 · 2026 highlighted · trend +0.03" per decade (wetter since 1894)

Warmest Sep 1 – Sep 10 on Record

# Year Avg Temp
1 2024 89.8°F
2 1979 88.8°F
3 2023 88.1°F
4 2019 88.0°F
5 1952 87.7°F
6 2011 87.6°F
7 1948 87.4°F
8 2022 87.4°F
9 2020 87.2°F
10 1995 86.8°F

Coolest Sep 1 – Sep 10 on Record

# Year Avg Temp
1 1894 77.2°F
2 1912 77.4°F
3 1929 78.0°F
4 1921 78.4°F
5 1919 78.6°F
6 1961 78.9°F
7 1920 79.0°F
8 1976 79.1°F
9 1913 79.4°F
10 1909 79.5°F

Wettest Sep 1 – Sep 10 on Record

# Year Total
1 1964 3.82"
2 1970 2.70"
3 1996 2.67"
4 2011 2.23"
5 2014 2.14"
6 2002 1.68"
7 1942 1.64"
8 1982 1.64"
9 2006 1.55"
10 1987 1.44"

Driest Sep 1 – Sep 10 on Record

# Year Total
1 2024 0.00"
2 2023 0.00"
3 2022 0.00"
4 2020 0.00"
5 2001 0.00"
6 2000 0.00"
7 1993 0.00"
8 1992 0.00"
9 1986 0.00"
10 1973 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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