Grand Junction, CO

Colorado · Records since 1893–2026

⛅ 86°F
Currently in Grand Junction
As of 12:30 PM MDT

Records for September 11

🔥 Record High

94°F

September 11, 1990

+10° from 84° normal

❄ Record Low

38°F

September 11, 1898

-16° from 54° normal
🌞 Normal high: 84°F 🌑 Normal low: 54°F 1991–2020 normals

All-Time Records — Grand Junction

🔥
107°F
Hottest Day Ever
Jul 17, 2023
❄
-23°F
Coldest Day Ever
Jan 13, 1963
🌧
1.87"
Wettest Day Ever
Sep 22, 1941
☃
14.0"
Most Snow in One Day
Nov 27, 1919

First & Last Dates — Grand Junction

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)
230 days
Longest growing season
1914
136 days
Shortest growing season
1978
169 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 94°F September 11, 1990
2 93°F September 11, 2018
3 93°F September 11, 1979
4 93°F September 11, 1974
5 92°F September 11, 2021
6 92°F September 11, 1970
7 92°F September 11, 1910
8 91°F September 11, 2009
9 91°F September 11, 1983
10 91°F September 11, 1972

Top 5 Record Lows — September 11

# Temp Date
🥶 38°F September 11, 1898
2 41°F September 11, 2003
3 43°F September 11, 1986
4 43°F September 11, 1947
5 43°F September 11, 1903
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 1893–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Grand Junction

threshold: 98°F (90th percentile of historical Jun–Aug highs)
5.0
Avg heat wave length
days (historical)
101°
Avg peak temp
during heat waves
26
Dangerous nights 2026
Overnights ≥ 70°F
4
Heat waves 2026
so far

Days ≥ 90°F Per Year

1893–2026
90
2026 so far
60
Avg/year 1970–2025
81
Avg/year (last 10 complete)
94
Most in a year (2024)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Grand Junction

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 10, 2003 – Jul 28, 2003 19 105°F (Jul 12) 101°F 70°F
2 Jul 24, 2026 – Aug 11, 2026 19 105°F (Aug 3) 101°F 70°F
3 Jul 16, 2023 – Jul 30, 2023 15 107°F (Jul 17) 101°F 70°F
4 Jun 17, 1974 – Jul 1, 1974 15 102°F (Jun 25) 100°F 63°F
5 Jul 5, 2002 – Jul 17, 2002 13 105°F (Jul 13) 102°F 68°F
6 Jul 9, 2024 – Jul 21, 2024 13 104°F (Jul 12) 100°F 71°F
7 Jul 27, 2024 – Aug 8, 2024 13 103°F (Aug 1) 100°F 68°F
8 Jul 2, 2021 – Jul 13, 2021 12 107°F (Jul 9) 100°F 68°F
9 Jul 17, 1931 – Jul 28, 1931 12 104°F (Jul 23) 101°F 70°F
10 Jun 22, 2012 – Jul 3, 2012 12 102°F (Jun 23) 100°F 70°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

72
2026 total
above-normal nights
45.8
Avg / summer
1970–2020
74
Most in a summer
1940

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 (1893–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1893, annual totals have trended +0.03" per decade, about +0.4" 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 Grand Junction is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

2.89"
2026 YTD
Normal: 6.06"
-3.17"
0.31"
September so far
September normal: 1.19"
-0.88"
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 · Grand Junction is 3.17" 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)
77.2°F
Average temperature
6th-warmest of 134
+2.7°
vs. average
Normal: 74.4°F (1991–2020)
0.84"
Precipitation
55th-driest of 133
-0.16"
vs. average
Normal: 1.00" · 84% of normal

Average Temperature by Year — Aug 11 – Sep 10

1893–2026 · 2026 highlighted · trend +0.16° per decade (warming since 1893)

Precipitation by Year — Aug 11 – Sep 10

1893–2026 · 2026 highlighted · trend -0.01" per decade (drier since 1893)

Warmest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1983 78.5°F
2 2022 78.0°F
3 2019 77.9°F
4 2023 77.9°F
5 1995 77.6°F
6 2026 77.2°F
7 1994 77.1°F
8 2007 77.1°F
9 2011 77.0°F
10 1919 77.0°F

Coolest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1968 68.7°F
2 1920 69.5°F
3 2014 70.0°F
4 1925 70.3°F
5 1957 70.5°F
6 1961 70.5°F
7 1907 70.7°F
8 1987 70.8°F
9 1900 70.9°F
10 1916 71.0°F

Wettest Aug 11 – Sep 10 on Record

# Year Total
1 1921 3.23"
2 1999 2.66"
3 2021 2.31"
4 1939 2.29"
5 2014 2.25"
6 1957 2.23"
7 1938 2.19"
8 2013 2.19"
9 1961 2.12"
10 1925 2.10"

Driest Aug 11 – Sep 10 on Record

# Year Total
1 1974 0.00"
2 1956 0.04"
3 1926 0.04"
4 1944 0.07"
5 1976 0.11"
6 1973 0.12"
7 1962 0.13"
8 2012 0.18"
9 1975 0.19"
10 1968 0.19"
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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