Great Falls, MT

Montana · Records since 1891–2026

☁️ 59°F Feels like 51°
Currently in Great Falls
As of 12:15 PM MDT

Records for September 7

🔥 Record High

100°F

September 7, 2022

+25° from 75° normal

❄ Record Low

27°F

September 7, 1929

-18° from 45° normal
🌞 Normal high: 75°F 🌑 Normal low: 45°F 1991–2020 normals

All-Time Records — Great Falls

🔥
107°F
Hottest Day Ever
Jul 25, 1933
❄
-49°F
Coldest Day Ever
Feb 15, 1936
🌧
3.36"
Wettest Day Ever
Jun 23, 1907
☃
16.5"
Most Snow in One Day
Apr 20, 1973

Top 10 Record Highs — September 7

# Temp Date
🏆 100°F September 7, 2022
2 95°F September 7, 1998
3 91°F September 7, 2024
4 91°F September 7, 2018
5 91°F September 7, 2011
6 91°F September 7, 1966
7 91°F September 7, 1963
8 91°F September 7, 1958
9 91°F September 7, 1957
10 91°F September 7, 1932

Top 5 Record Lows — September 7

# Temp Date
🥶 27°F September 7, 1929
2 31°F September 7, 1935
3 32°F September 7, 1962
4 33°F September 7, 1892
5 34°F September 7, 1985
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 1891–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Great Falls

threshold: 93°F (90th percentile of historical Jun–Aug highs)
4.3
Avg heat wave length
days (historical)
99°
Avg peak temp
during heat waves
0
Dangerous nights 2026
Overnights ≥ 70°F
2
Heat waves 2026
so far

2026 Daily High Temperature vs Normal

Year to date
Above normal Below normal

157 of 249 days with data were above the 1991–2020 normal high for their date.

Days ≥ 90°F Per Year

1892–2026
23
2026 so far
20
Avg/year 1970–2025
27
Avg/year (last 10 complete)
50
Most in a year (1919)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Great Falls

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 13, 2007 – Jul 23, 2007 11 104°F (Jul 15) 98°F 64°F
2 Jun 30, 1985 – Jul 10, 1985 11 101°F (Jul 5) 98°F 60°F
3 Jul 14, 1960 – Jul 23, 1960 10 102°F (Jul 22) 96°F 64°F
4 Aug 1, 1971 – Aug 9, 1971 9 101°F (Aug 5) 98°F 64°F
5 Jul 16, 1917 – Jul 24, 1917 9 100°F (Jul 22) 96°F 57°F
6 Jul 20, 1931 – Jul 27, 1931 8 103°F (Jul 21) 100°F 59°F
7 Jul 17, 1936 – Jul 24, 1936 8 102°F (Jul 17) 98°F 65°F
8 Jul 28, 2022 – Aug 4, 2022 8 101°F (Aug 1) 96°F 58°F
9 Jul 9, 1939 – Jul 16, 1939 8 100°F (Jul 10) 96°F 60°F
10 Jul 22, 2006 – Jul 29, 2006 8 100°F (Jul 28) 97°F 59°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

54
2026 total
above-normal nights
50.7
Avg / summer
1970–2020
82
Most in a summer
1961

Above-Normal Summer Nights Per Year

Average June–August Low by Decade

Overnight lows · complete decades only

Precipitation

Actual vs. 1991–2020 full-month and full-season normals

13.99"
2026 YTD
Normal: 11.44"
+2.55"
0.03"
September so far
September normal: 1.33"
-1.30"
4
2026 heavy rain days
Days with ≥ 1.0"

2026 Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Great Falls is 2.55" ahead of the normal pace

Monthly Precipitation — Last 24 Months

Blue = actual · dashed line = monthly normal

Annual Precipitation Per Year (1891–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1891, 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")

Month in Review — August 2026

66.7°F

Average temperature · August 2026

194th-warmest month on record

78th-warmest August of 133 on record

-0.3° vs. 67.0° average (1991–2020)
76.8°F
Warmest month ever
July 2007
76.0°F
Warmest August ever
1971
6
Days ≥ 90°F
in August
102°F
Hottest of 2026
Aug 1

Longest 90°F Streak in August

2 consecutive days with highs of at least 90°F (Aug 26–27, 2026, peaking at 91°F)

The longest August streak since 2025 (1 year). The August record is 16 days, set in 1971.

Average August Temperature by Year

1894–2026 · 2026 highlighted

Precipitation — August 2026

Month total against the 1991–2020 average and every other August on record

1.44"
Total precipitation
August 2026
+0.23"
vs. average
Normal: 1.21" · 119% of normal
41st-wettest
August rank
of 135 on record
5.34"
Wettest August ever
1933 · driest 0.03" (1969)

August Precipitation by Year

1892–2026 · 2026 highlighted · trend +0.02" per decade (wetter since 1892)

Wettest Augusts on Record

# Year Total
1 1933 5.34"
2 1932 4.95"
3 1985 4.90"
4 1989 4.88"
5 1974 4.76"
6 2014 4.39"
7 1990 3.19"
8 1908 3.13"
9 1912 3.10"
10 1993 3.04"

Driest Augusts on Record

# Year Total
1 1969 0.03"
2 1955 0.04"
3 1940 0.05"
4 2017 0.06"
5 1897 0.07"
6 2020 0.10"
7 1893 0.11"
8 2000 0.12"
9 1901 0.12"
10 1934 0.16"

Warmest Augusts on Record

# Year Avg Temp
1 1971 76.0°F
2 1961 72.4°F
3 1983 72.4°F
4 2022 72.3°F
5 1969 72.1°F
6 1929 71.8°F
7 1930 71.7°F
8 1991 71.6°F
9 1984 71.6°F
10 1973 71.2°F

Warmest Months on Record (Any Month)

# Month Avg Temp
1 July 2007 76.8°F
2 July 1936 76.4°F
3 August 1971 76.0°F
4 July 1960 74.5°F
5 July 2021 73.7°F
6 July 2006 73.5°F
7 July 2017 73.4°F
8 July 1947 73.1°F
9 July 1917 73.0°F
10 July 1985 73.0°F

Nearby Stations — August 2026

How the same month ranked at the closest reporting stations

Station Avg Temp August Rank
Great Falls, MT 66.7°F 78th of 133
Helena, MT 69.8°F 22nd of 147
Havre, MT 68.3°F 60th of 147
Missoula, MT 68.4°F 32nd of 125
About this data. Monthly averages are the mean of daily average temperatures, computed from NOAA Threadex records via RCC ACIS. Months missing more than three days of observations are excluded from the rankings, so the in-progress month never appears. Rankings cover 1,573 complete months on record. Precipitation totals sum the daily reports for the month, with trace amounts counted as zero. A month missing any day of precipitation data is left out entirely (an unreported day is unreported rain), so the precipitation ranking covers 135 complete Augusts. Normals are the 1991–2020 mean for the same calendar month. Trend lines are a least-squares fit across every year shown.

Fall in Review — Fall 2026

September 1 – November 30, 2026

Fall 2026 is still under way. Season totals and rankings appear once November closes; the markers below update as they happen.

Summer to Winter — 2026

Each turning point of the season against its 1991–2020 normal date, with the earliest and latest on record

Marker 2026 Normal vs. normal Earliest Latest Drift
Last 90°F day
The final day of summer heat
 Aug 27
so far
 Sep 8 Jun 27, 1912 Oct 11, 1934 +1.2 d/decade
Last 80°F day
The last genuinely warm afternoon
 Sep 2
so far
 Sep 27 Aug 20, 1900 Oct 22, 1915 +0.4 d/decade
First high below 50°F
The first afternoon that stays cold
 not yet Sep 21 Jul 24, 1918 Nov 4, 1902 -0.8 d/decade
First 32°F freeze
Growing season over
 not yet Sep 21 Aug 22, 1992 Oct 28, 1940 -0.2 d/decade
First 28°F hard freeze
Cold enough to end tender growth
 not yet Oct 4 Sep 6, 1929 Nov 4, 1947 -0.1 d/decade
First 20°F night
Winter cold arriving
 not yet Oct 24 Sep 21, 1995 Dec 2, 1953 -0.7 d/decade
First measurable snow
0.1" or more in a day
 not yet Oct 7 Aug 22, 1992 Dec 21, 1939 -1.5 d/decade

Drift is a least-squares fit across every year on record. Positive means the marker has been arriving later.

First Freeze by Year

The first 32°F night of each autumn since 1892 · trending -0.2 days earlier per decade

123
Normal length
1991–2020 average
184
Longest on record
1940
91
Shortest on record
1992

Growing Season Length by Year

Days between the last spring freeze and the first fall freeze · trending -1.2 days shorter per decade

Fall Average Temperature by Year

1898–2025 · 2026 highlighted · trend -0.10° per decade (cooling since 1898)

Fall Precipitation by Year

1893–2025 · 2026 highlighted · trend +0.01" per decade (wetter since 1893)

About this data. Fall is meteorological autumn, September 1 through November 30, the window NOAA uses for seasonal statistics. Seasonal temperature is the day-weighted mean of the three monthly means; precipitation is their sum, and a season missing any of the three months is left out of the rankings. Freeze, heat and snow markers come from daily NOAA Threadex observations via RCC ACIS: freezes and snow are the first occurrence on or after July 1, and the last 90°F and 80°F days are the final ones anywhere in the calendar year. Growing season counts the freeze-free days between the last spring 32°F and the first fall 32°F.
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