Rockford, IL

Illinois · Records since 1893–2026

☀️ 80°F
Currently in Rockford
As of 12:45 PM CDT

Records for September 7

🔥 Record High

103°F

September 7, 1939

+25° from 78° normal

❄ Record Low

37°F

September 7, 1986

-20° from 57° normal
🌞 Normal high: 78°F 🌑 Normal low: 57°F 1991–2020 normals

All-Time Records — Rockford

🔥
112°F
Hottest Day Ever
Jul 14, 1936
❄
-31°F
Coldest Day Ever
Jan 31, 2019
🌧
5.70"
Wettest Day Ever
Aug 14, 1987
☃
13.5"
Most Snow in One Day
Mar 31, 1926

Top 10 Record Highs — September 7

# Temp Date
🏆 103°F September 7, 1939
2 100°F September 7, 1922
3 96°F September 7, 1933
4 95°F September 7, 1960
5 95°F September 7, 1959
6 95°F September 7, 1913
7 94°F September 7, 1897
8 93°F September 7, 1985
9 92°F September 7, 1978
10 91°F September 7, 2013

Top 5 Record Lows — September 7

# Temp Date
🥶 37°F September 7, 1986
2 39°F September 7, 2025
3 39°F September 7, 1956
4 42°F September 7, 1932
5 43°F September 7, 1962
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 — Rockford

threshold: 92°F (90th percentile of historical Jun–Aug highs)
4.4
Avg heat wave length
days (historical)
98°
Avg peak temp
during heat waves
17
Dangerous nights 2026
Overnights ≥ 70°F
0
Heat waves 2026
so far

2026 Daily High Temperature vs Normal

Year to date
Above normal Below normal

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

Days ≥ 90°F Per Year

1893–2026
17
2026 so far
20
Avg/year 1970–2025
19
Avg/year (last 10 complete)
62
Most in a year (1921)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Rockford

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 6, 1936 – Jul 18, 1936 13 112°F (Jul 14) 104°F 70°F
2 Jul 22, 1916 – Aug 1, 1916 11 105°F (Jul 31) 98°F 69°F
3 Jul 26, 1955 – Aug 4, 1955 10 103°F (Jul 27) 97°F 72°F
4 Aug 25, 1953 – Sep 3, 1953 10 102°F (Sep 1) 98°F 66°F
5 Jun 28, 1921 – Jul 7, 1921 10 100°F (Jul 4) 97°F 69°F
6 Jul 13, 1932 – Jul 22, 1932 10 100°F (Jul 15) 97°F 67°F
7 Jul 23, 1941 – Jul 31, 1941 9 102°F (Jul 29) 96°F 71°F
8 Jun 16, 1921 – Jun 24, 1921 9 95°F (Jun 18) 93°F 67°F
9 Jul 19, 1934 – Jul 26, 1934 8 107°F (Jul 24) 102°F 72°F
10 May 29, 1934 – Jun 5, 1934 8 106°F (May 31) 99°F 64°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

39
2026 total
above-normal nights
39.5
Avg / summer
1970–2020
65
Most in a summer
1983

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

22.25"
2026 YTD
Normal: 27.59"
-5.34"
0.02"
September so far
September normal: 3.62"
-3.60"
6
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 · Rockford is 5.34" behind the normal pace

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 +0.57" per decade, about +7.6" 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

71.7°F

Average temperature · August 2026

200th-warmest month on record

67th-warmest August of 127 on record

+0.0° vs. 71.7° average (1991–2020)
80.8°F
Warmest month ever
July 2012
80.6°F
Warmest August ever
1947
96°F
Hottest of 2026
Jul 27

Average August Temperature by Year

1893–2026 · 2026 highlighted

Precipitation — August 2026

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

2.36"
Total precipitation
August 2026
-1.83"
vs. average
Normal: 4.19" · 56% of normal
37th-driest
August rank
of 127 on record
13.98"
Wettest August ever
2007 · driest 0.21" (1922)

August Precipitation by Year

1893–2026 · 2026 highlighted · trend +0.07" per decade (wetter since 1893)

Wettest Augusts on Record

# Year Total
1 2007 13.98"
2 1987 13.55"
3 1936 10.73"
4 1965 9.27"
5 1981 9.18"
6 1972 9.10"
7 2022 8.88"
8 1911 8.70"
9 1940 7.95"
10 1942 7.88"

Driest Augusts on Record

# Year Total
1 1922 0.21"
2 1917 0.45"
3 2003 0.48"
4 2020 0.57"
5 1970 0.67"
6 1897 0.90"
7 1930 1.08"
8 1961 1.12"
9 1893 1.13"
10 1927 1.20"

Warmest Augusts on Record

# Year Avg Temp
1 1947 80.6°F
2 1983 77.2°F
3 1995 77.1°F
4 1937 77.0°F
5 1936 76.4°F
6 1988 76.4°F
7 1955 76.3°F
8 1918 75.8°F
9 1895 75.8°F
10 1959 75.8°F

Warmest Months on Record (Any Month)

# Month Avg Temp
1 July 2012 80.8°F
2 August 1947 80.6°F
3 July 1921 80.3°F
4 July 1936 80.0°F
5 July 1955 79.4°F
6 July 1916 79.0°F
7 July 2011 78.9°F
8 July 1935 78.3°F
9 July 1934 78.1°F
10 July 1983 78.0°F

Nearby Stations — August 2026

How the same month ranked at the closest reporting stations

Station Avg Temp August Rank
Rockford, IL 71.7°F 67th of 127
Madison, WI 70.4°F 73rd of 158
Chicago, IL 74.2°F 40th of 155
Milwaukee, WI 71.7°F 45th of 156
Dubuque, IA 70.7°F 86th of 153
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 1,478 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 127 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
 Sep 4
so far
 Aug 27 Apr 29, 1915 Oct 9, 2010 -0.5 d/decade
Last 80°F day
The last genuinely warm afternoon
 Sep 6
so far
 Oct 5 Sep 10, 1996 Nov 1, 1933 -0.1 d/decade
First high below 50°F
The first afternoon that stays cold
 not yet Oct 17 Sep 21, 1995 Nov 16, 2024
First 32°F freeze
Growing season over
 not yet Oct 13 Sep 13, 1975 Nov 11, 2016 +0.6 d/decade
First 28°F hard freeze
Cold enough to end tender growth
 not yet Oct 22 Sep 25, 1942 Nov 17, 1985 +0.1 d/decade
First 20°F night
Winter cold arriving
 not yet Nov 17 Oct 18, 1948 Dec 9, 2011 +0.3 d/decade
First measurable snow
0.1" or more in a day
 not yet Nov 21 Oct 12, 1909 Dec 21, 1920 -0.2 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 1895 · trending +0.6 days later per decade

168
Normal length
1991–2020 average
204
Longest on record
2017
121
Shortest on record
1929

Growing Season Length by Year

Days between the last spring freeze and the first fall freeze · trending +1.2 days longer per decade

Fall Average Temperature by Year

1897–2025 · 2026 highlighted

Fall Precipitation by Year

1895–2025 · 2026 highlighted · trend -0.06" per decade (drier since 1895)

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.
← Back to all stations