Flagstaff, AZ

Arizona · Records since 1898–2026

🌙 61°F Feels like 57°
Currently in Flagstaff
As of 7:15 PM MST

Records for September 26

🔥 Record High

84°F

September 26, 2024

+13° from 71° normal

❄ Record Low

22°F

September 26, 1934

-17° from 39° normal
🌞 Normal high: 71°F 🌑 Normal low: 39°F 1991–2020 normals

All-Time Records — Flagstaff

🔥
97°F
Hottest Day Ever
Jul 5, 1973
❄
-30°F
Coldest Day Ever
Jan 22, 1937
🌧
3.93"
Wettest Day Ever
Feb 19, 1993
☃
35.9"
Most Snow in One Day
Feb 21, 2019

First & Last Dates — Flagstaff

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)
153 days
Longest growing season
2009
16 days
Shortest growing season
1912
111 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 26

# Temp Date
🏆 84°F September 26, 2024
2 84°F September 26, 1899
3 83°F September 26, 1947
4 82°F September 26, 2003
5 82°F September 26, 1963
6 81°F September 26, 2001
7 81°F September 26, 1991
8 81°F September 26, 1956
9 81°F September 26, 1921
10 80°F September 26, 2010

Top 5 Record Lows — September 26

# Temp Date
🥶 22°F September 26, 1934
2 25°F September 26, 1900
3 26°F September 26, 1912
4 27°F September 26, 1920
5 28°F September 26, 2017
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 1898–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Flagstaff

threshold: 87°F (90th percentile of historical Jun–Aug highs)
4.6
Avg heat wave length
days (historical)
91°
Avg peak temp
during heat waves
0
Dangerous nights 2026
Overnights ≥ 70°F
3
Heat waves 2026
so far

Days ≥ 90°F Per Year

1900–2026
7
2026 so far
5
Avg/year 1970–2025
8
Avg/year (last 10 complete)
15
Most in a year (1974)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Flagstaff

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jun 11, 1974 – Jun 30, 1974 20 94°F (Jun 24) 91°F 51°F
2 Jul 12, 2023 – Jul 29, 2023 18 96°F (Jul 16) 91°F 56°F
3 Jul 4, 2003 – Jul 17, 2003 14 94°F (Jul 9) 90°F 52°F
4 Jun 20, 1990 – Jul 1, 1990 12 94°F (Jun 25) 92°F 52°F
5 Jul 3, 2024 – Jul 14, 2024 12 94°F (Jul 7) 91°F 52°F
6 Jun 16, 2017 – Jun 26, 2017 11 93°F (Jun 23) 90°F 51°F
7 Aug 2, 2025 – Aug 12, 2025 11 91°F (Aug 12) 88°F 51°F
8 Jul 12, 2005 – Jul 21, 2005 10 93°F (Jul 18) 90°F 54°F
9 Jun 30, 1989 – Jul 8, 1989 9 96°F (Jul 6) 91°F 48°F
10 Jul 1, 1985 – Jul 9, 1985 9 94°F (Jul 4) 90°F 53°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

74
2026 total
above-normal nights
39.7
Avg / summer
1970–2020
79
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 (1898–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1898, annual totals have trended +0.11" per decade, about +1.4" 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 Flagstaff is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

187 of 267 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

10.45"
2026 YTD
Normal: 15.34"
-4.89"
0.78"
September so far
September normal: 1.84"
-1.06"
1
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Flagstaff is 4.89" behind the normal pace

Period Review — Sep 18 – Sep 25, 2026

Any window, evaluated against every other year on record — 8 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
58.0°F
Average temperature
36th-warmest of 129
+1.7°
vs. average
Normal: 56.3°F (1991–2020)

Average Temperature by Year — Sep 18 – Sep 25

1898–2026 · 2026 highlighted · trend +0.08° per decade (warming since 1898)

Precipitation by Year — Sep 18 – Sep 25

1898–2025 · 2026 highlighted · trend +0.01" per decade (wetter since 1898)

Warmest Sep 18 – Sep 25 on Record

# Year Avg Temp
1 1947 61.8°F
2 1992 61.8°F
3 2020 61.6°F
4 1966 61.2°F
5 1949 61.1°F
6 1933 61.0°F
7 1982 61.0°F
8 2014 60.8°F
9 1935 60.2°F
10 1991 60.2°F

Coolest Sep 18 – Sep 25 on Record

# Year Avg Temp
1 1971 44.9°F
2 1965 47.6°F
3 1923 48.5°F
4 2006 48.8°F
5 1900 49.0°F
6 1986 49.5°F
7 1961 49.9°F
8 1970 50.4°F
9 1950 50.5°F
10 1955 50.5°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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