Indianapolis, IN

Indiana · Records since 1871–2026

☀️ 82°F Feels like 86°
Currently in Indianapolis
As of 2:00 PM EDT

Records for September 11

🔥 Record High

95°F

September 11, 2013

+15° from 80° normal

❄ Record Low

39°F

September 11, 1917

-20° from 59° normal
🌞 Normal high: 80°F 🌑 Normal low: 59°F 1991–2020 normals

All-Time Records — Indianapolis

🔥
106°F
Hottest Day Ever
Jul 14, 1936
❄
-27°F
Coldest Day Ever
Jan 19, 1994
🌧
7.20"
Wettest Day Ever
Sep 1, 2003
☃
12.1"
Most Snow in One Day
Mar 19, 1906

First & Last Dates — Indianapolis

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)
232 days
Longest growing season
1872
147 days
Shortest growing season
1974
187 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 95°F September 11, 2013
2 95°F September 11, 1897
3 94°F September 11, 1952
4 93°F September 11, 1933
5 92°F September 11, 1936
6 92°F September 11, 1931
7 92°F September 11, 1908
8 92°F September 11, 1895
9 91°F September 11, 1953
10 91°F September 11, 1947

Top 5 Record Lows — September 11

# Temp Date
🥶 39°F September 11, 1917
2 42°F September 11, 1993
3 43°F September 11, 1970
4 44°F September 11, 1883
5 45°F September 11, 1976
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 1871–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Indianapolis

threshold: 92°F (90th percentile of historical Jun–Aug highs)
4.5
Avg heat wave length
days (historical)
96°
Avg peak temp
during heat waves
36
Dangerous nights 2026
Overnights ≥ 70°F
3
Heat waves 2026
so far

Days ≥ 90°F Per Year

1871–2026
24
2026 so far
21
Avg/year 1970–2025
23
Avg/year (last 10 complete)
58
Most in a year (1983)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Indianapolis

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 17, 2011 – Aug 2, 2011 17 100°F (Jul 21) 95°F 75°F
2 Jul 3, 1936 – Jul 17, 1936 15 106°F (Jul 14) 101°F 76°F
3 Jun 28, 2012 – Jul 12, 2012 15 105°F (Jul 6) 99°F 73°F
4 Jul 20, 1901 – Jul 30, 1901 11 106°F (Jul 22) 97°F 75°F
5 Jul 21, 1940 – Jul 31, 1940 11 103°F (Jul 30) 96°F 76°F
6 Jul 26, 1887 – Aug 5, 1887 11 101°F (Jul 30) 97°F 70°F
7 Sep 7, 1897 – Sep 16, 1897 10 96°F (Sep 12) 94°F 68°F
8 Jul 5, 1881 – Jul 13, 1881 9 101°F (Jul 10) 96°F 79°F
9 Aug 18, 1936 – Aug 26, 1936 9 101°F (Aug 22) 98°F 75°F
10 Jul 23, 1916 – Jul 31, 1916 9 100°F (Jul 27) 97°F 74°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

59
2026 total
above-normal nights
44.3
Avg / summer
1970–2020
82
Most in a summer
1874

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 +0.14" per decade, about +2.1" 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 Indianapolis is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

34.79"
2026 YTD
Normal: 31.94"
+2.85"
0.01"
September so far
September normal: 3.14"
-3.13"
14
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Indianapolis is 2.85" 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)
76.6°F
Average temperature
14th-warmest of 156
+3.0°
vs. average
Normal: 73.6°F (1991–2020)
5.15"
Precipitation
22nd-wettest of 156
+1.80"
vs. average
Normal: 3.35" · 154% of normal

Average Temperature by Year — Aug 11 – Sep 10

1871–2026 · 2026 highlighted · trend +0.07° per decade (warming since 1871)

Precipitation by Year — Aug 11 – Sep 10

1871–2026 · 2026 highlighted · trend -0.01" per decade (drier since 1871)

Warmest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1936 79.8°F
2 1983 79.2°F
3 1900 78.5°F
4 1947 77.9°F
5 2007 77.8°F
6 1881 77.7°F
7 1872 77.6°F
8 2002 77.3°F
9 1922 77.3°F
10 1995 77.0°F

Coolest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1963 66.8°F
2 1885 66.9°F
3 1915 67.2°F
4 1946 67.5°F
5 1879 67.9°F
6 1891 68.2°F
7 1883 68.5°F
8 1924 68.5°F
9 1967 68.5°F
10 1986 68.5°F

Wettest Aug 11 – Sep 10 on Record

# Year Total
1 1989 11.45"
2 1926 10.73"
3 2003 10.67"
4 1993 8.57"
5 1876 8.23"
6 2016 8.19"
7 1921 8.08"
8 1895 7.70"
9 1890 7.68"
10 1980 7.67"

Driest Aug 11 – Sep 10 on Record

# Year Total
1 2013 0.30"
2 2010 0.36"
3 1884 0.40"
4 1893 0.61"
5 1955 0.66"
6 1964 0.68"
7 1953 0.70"
8 1969 0.73"
9 1987 0.78"
10 2011 0.82"
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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