Moline, IL

Illinois · Records since 1874–2026

🌙 61°F
Currently in Moline
As of 9:15 PM CDT

Records for September 26

🔥 Record High

90°F

September 26, 1891

+16° from 74° normal

❄ Record Low

32°F

September 26, 1940

-18° from 50° normal
🌞 Normal high: 74°F 🌑 Normal low: 50°F 1991–2020 normals

All-Time Records — Moline

🔥
111°F
Hottest Day Ever
Jul 14, 1936
❄
-33°F
Coldest Day Ever
Jan 31, 2019
🌧
6.21"
Wettest Day Ever
Sep 13, 1961
☃
16.4"
Most Snow in One Day
Jan 3, 1971

First & Last Dates — Moline

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)
213 days
Longest growing season
1882
139 days
Shortest growing season
1989
171 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 26

# Temp Date
🏆 90°F September 26, 1891
2 89°F September 26, 1998
3 88°F September 26, 1953
4 88°F September 26, 1946
5 88°F September 26, 1897
6 87°F September 26, 2021
7 87°F September 26, 1881
8 86°F September 26, 2025
9 86°F September 26, 1951
10 86°F September 26, 1898

Top 5 Record Lows — September 26

# Temp Date
🥶 32°F September 26, 1940
2 34°F September 26, 1975
3 34°F September 26, 1926
4 35°F September 26, 1984
5 35°F September 26, 1912
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 1874–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Moline

threshold: 93°F (90th percentile of historical Jun–Aug highs)
4.4
Avg heat wave length
days (historical)
98°
Avg peak temp
during heat waves
24
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1874–2026
22
2026 so far
23
Avg/year 1970–2025
27
Avg/year (last 10 complete)
59
Most in a year (1936)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Moline

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 9, 1901 – Jul 27, 1901 19 106°F (Jul 24) 98°F 73°F
2 Jul 3, 1936 – Jul 18, 1936 16 111°F (Jul 14) 103°F 78°F
3 Jul 22, 1916 – Jul 31, 1916 10 104°F (Jul 29) 99°F 75°F
4 Jun 22, 1931 – Jul 1, 1931 10 104°F (Jun 30) 101°F 78°F
5 Aug 25, 1953 – Sep 3, 1953 10 100°F (Aug 31) 97°F 68°F
6 May 29, 1934 – Jun 6, 1934 9 104°F (May 31) 99°F 67°F
7 Jul 11, 1916 – Jul 19, 1916 9 99°F (Jul 18) 96°F 73°F
8 Jul 19, 1987 – Jul 27, 1987 9 99°F (Jul 25) 96°F 72°F
9 Aug 31, 1960 – Sep 8, 1960 9 98°F (Sep 6) 96°F 69°F
10 Aug 2, 1900 – Aug 10, 1900 9 97°F (Aug 5) 95°F 73°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

45
2026 total
above-normal nights
43.3
Avg / summer
1970–2020
72
Most in a summer
2010

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 (1871–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1871, annual totals have trended +0.54" per decade, about +8.3" 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 Moline is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

33.79"
2026 YTD
Normal: 30.56"
+3.23"
5.64"
September so far
September normal: 3.32"
+2.32"
12
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Moline is 3.23" ahead of the normal pace

Period Review — Aug 26 – Sep 25, 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)
72.2°F
Average temperature
12th-warmest of 153
+4.2°
vs. average
Normal: 68.0°F (1991–2020)

Average Temperature by Year — Aug 26 – Sep 25

1874–2026 · 2026 highlighted · trend +0.05° per decade (warming since 1874)

Precipitation by Year — Aug 26 – Sep 25

1872–2025 · 2026 highlighted · trend +0.04" per decade (wetter since 1872)

Warmest Aug 26 – Sep 25 on Record

# Year Avg Temp
1 1931 73.8°F
2 2016 73.0°F
3 1908 72.9°F
4 1930 72.7°F
5 1947 72.6°F
6 1895 72.6°F
7 2005 72.6°F
8 1897 72.6°F
9 1927 72.4°F
10 1921 72.3°F

Coolest Aug 26 – Sep 25 on Record

# Year Avg Temp
1 1879 61.7°F
2 1918 61.8°F
3 1949 62.0°F
4 1974 62.2°F
5 1883 62.4°F
6 1896 63.0°F
7 1902 63.0°F
8 1885 63.1°F
9 1943 63.1°F
10 1968 63.7°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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