Peoria, IL

Illinois · Records since 1883–2026

☁️ 62°F
Currently in Peoria
As of 8:45 PM CDT

Records for September 26

🔥 Record High

93°F

September 26, 1897

+18° from 75° normal

❄ Record Low

29°F

September 26, 1928

-23° from 52° normal
🌞 Normal high: 75°F 🌑 Normal low: 52°F 1991–2020 normals

All-Time Records — Peoria

🔥
113°F
Hottest Day Ever
Jul 15, 1936
❄
-27°F
Coldest Day Ever
Jan 5, 1884
🌧
5.52"
Wettest Day Ever
May 18, 1927
☃
12.2"
Most Snow in One Day
Jan 13, 1979

First & Last Dates — Peoria

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)
228 days
Longest growing season
2024
136 days
Shortest growing season
1925
185 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 26

# Temp Date
🏆 93°F September 26, 1897
2 92°F September 26, 1891
3 91°F September 26, 2017
4 91°F September 26, 1920
5 89°F September 26, 1998
6 87°F September 26, 1953
7 87°F September 26, 1938
8 87°F September 26, 1908
9 87°F September 26, 1898
10 86°F September 26, 1956

Top 5 Record Lows — September 26

# Temp Date
🥶 29°F September 26, 1928
2 31°F September 26, 1926
3 34°F September 26, 1940
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 1883–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Peoria

threshold: 94°F (90th percentile of historical Jun–Aug highs)
4.5
Avg heat wave length
days (historical)
99°
Avg peak temp
during heat waves
34
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1883–2026
22
2026 so far
28
Avg/year 1970–2025
26
Avg/year (last 10 complete)
69
Most in a year (1887)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Peoria

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 3, 1936 – Jul 18, 1936 16 113°F (Jul 15) 105°F 74°F
2 Jun 17, 1933 – Jun 27, 1933 11 101°F (Jun 26) 96°F 67°F
3 Jul 26, 1887 – Aug 4, 1887 10 104°F (Jul 29) 99°F 72°F
4 Jul 19, 1901 – Jul 27, 1901 9 106°F (Jul 24) 101°F 73°F
5 Jul 9, 1901 – Jul 17, 1901 9 104°F (Jul 10) 96°F 67°F
6 Jun 24, 1931 – Jul 2, 1931 9 103°F (Jun 29) 101°F 75°F
7 Aug 26, 1953 – Sep 3, 1953 9 100°F (Sep 1) 96°F 68°F
8 Aug 2, 1900 – Aug 10, 1900 9 99°F (Aug 5) 97°F 69°F
9 Sep 7, 1897 – Sep 15, 1897 9 97°F (Sep 10) 96°F 66°F
10 Jul 24, 1916 – Jul 31, 1916 8 103°F (Jul 29) 100°F 72°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
41.5
Avg / summer
1970–2020
67
Most in a summer
2016

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 (1883–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1883, annual totals have trended +0.29" per decade, about +4.1" 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 Peoria is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

136 of 265 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

33.27"
2026 YTD
Normal: 28.98"
+4.29"
2.43"
September so far
September normal: 3.48"
-1.05"
11
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Peoria is 4.29" 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)
74.2°F
Average temperature
2nd-warmest of 144
+5.0°
vs. average
Normal: 69.2°F (1991–2020)

Average Temperature by Year — Aug 26 – Sep 25

1883–2026 · 2026 highlighted

Precipitation by Year — Aug 26 – Sep 25

1883–2025 · 2026 highlighted · trend -0.02" per decade (drier since 1883)

Warmest Aug 26 – Sep 25 on Record

# Year Avg Temp
1 1931 74.8°F
2 2026 74.2°F
3 2005 74.2°F
4 1895 74.1°F
5 2015 74.0°F
6 1939 74.0°F
7 2016 73.8°F
8 1884 73.8°F
9 2018 73.8°F
10 1933 73.5°F

Coolest Aug 26 – Sep 25 on Record

# Year Avg Temp
1 1918 61.7°F
2 1974 63.2°F
3 1949 63.5°F
4 1975 63.9°F
5 1924 64.1°F
6 1943 64.2°F
7 1968 65.0°F
8 1967 65.0°F
9 1917 65.2°F
10 1916 65.3°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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