St Louis, MO

Missouri · Records since 1874–2026

☁️ 77°F Feels like 83°
Currently in St Louis
As of 1:00 PM CDT

Records for September 11

🔥 Record High

98°F

September 11, 2013

+15° from 83° normal

❄ Record Low

42°F

September 11, 1940

-21° from 63° normal
🌞 Normal high: 83°F 🌑 Normal low: 63°F 1991–2020 normals

All-Time Records — St Louis

🔥
115°F
Hottest Day Ever
Jul 14, 1954
❄
-22°F
Coldest Day Ever
Jan 5, 1884
🌧
8.64"
Wettest Day Ever
Jul 26, 2022
☃
12.8"
Most Snow in One Day
Feb 26, 1906

First & Last Dates — St Louis

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)
260 days
Longest growing season
1922
159 days
Shortest growing season
1966
214 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 98°F September 11, 2013
2 97°F September 11, 1938
3 97°F September 11, 1936
4 96°F September 11, 1953
5 95°F September 11, 2000
6 95°F September 11, 1933
7 95°F September 11, 1897
8 95°F September 11, 1895
9 94°F September 11, 1952
10 94°F September 11, 1947

Top 5 Record Lows — September 11

# Temp Date
🥶 42°F September 11, 1940
2 43°F September 11, 1917
3 47°F September 11, 1970
4 47°F September 11, 1967
5 49°F September 11, 1878
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 — St Louis

threshold: 96°F (90th percentile of historical Jun–Aug highs)
4.7
Avg heat wave length
days (historical)
101°
Avg peak temp
during heat waves
65
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1874–2026
44
2026 so far
43
Avg/year 1970–2025
56
Avg/year (last 10 complete)
79
Most in a year (1936)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — St Louis

# Dates Days Peak Avg High Avg Overnight Low
🏆 Aug 12, 1936 – Aug 28, 1936 17 106°F (Aug 18) 103°F 78°F
2 Jun 20, 1901 – Jul 6, 1901 17 102°F (Jun 29) 98°F 78°F
3 Jul 4, 1936 – Jul 18, 1936 15 108°F (Jul 14) 103°F 77°F
4 Jul 15, 1901 – Jul 28, 1901 14 107°F (Jul 22) 101°F 79°F
5 Jul 7, 1980 – Jul 20, 1980 14 107°F (Jul 15) 101°F 79°F
6 Jun 27, 2012 – Jul 8, 2012 12 108°F (Jun 28) 104°F 78°F
7 Jun 21, 1931 – Jul 2, 1931 12 104°F (Jul 1) 100°F 75°F
8 Jul 24, 1953 – Aug 3, 1953 11 104°F (Jul 30) 100°F 76°F
9 Jul 12, 1932 – Jul 22, 1932 11 102°F (Jul 15) 99°F 73°F
10 Jun 23, 1952 – Jul 2, 1952 10 105°F (Jun 29) 100°F 77°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

47
2026 total
above-normal nights
42.7
Avg / summer
1970–2020
73
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 (1874–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1874, annual totals have trended +0.37" per decade, about +5.7" 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 St Louis is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

36.50"
2026 YTD
Normal: 30.72"
+5.78"
0.25"
September so far
September normal: 2.96"
-2.71"
15
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · St Louis is 5.78" ahead of 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)
81.6°F
Average temperature
10th-warmest of 153
+4.2°
vs. average
Normal: 77.4°F (1991–2020)
2.10"
Precipitation
53rd-driest of 146
-1.23"
vs. average
Normal: 3.33" · 63% of normal

Average Temperature by Year — Aug 11 – Sep 10

1874–2026 · 2026 highlighted · trend +0.11° per decade (warming since 1874)

Precipitation by Year — Aug 11 – Sep 10

1874–2026 · 2026 highlighted · trend -0.02" per decade (drier since 1874)

Warmest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1936 84.1°F
2 1947 83.5°F
3 1983 83.3°F
4 1881 82.6°F
5 1900 82.6°F
6 1913 82.5°F
7 1925 81.8°F
8 2007 81.7°F
9 1899 81.6°F
10 2026 81.6°F

Coolest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1967 69.2°F
2 1950 70.7°F
3 1915 70.8°F
4 1885 70.8°F
5 1935 71.3°F
6 1891 71.4°F
7 1974 71.4°F
8 1879 71.6°F
9 1963 71.6°F
10 1946 71.9°F

Wettest Aug 11 – Sep 10 on Record

# Year Total
1 1946 11.22"
2 1916 10.98"
3 1915 9.72"
4 1876 9.41"
5 1914 9.39"
6 1918 8.14"
7 2016 7.53"
8 1931 7.22"
9 1984 7.17"
10 1903 6.84"

Driest Aug 11 – Sep 10 on Record

# Year Total
1 1957 0.37"
2 1978 0.45"
3 1999 0.51"
4 2020 0.52"
5 1953 0.52"
6 1908 0.54"
7 1897 0.57"
8 1961 0.59"
9 1955 0.61"
10 1956 0.63"
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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