Cedar Rapids, IA

Iowa · Records since 1893–2026

🌤️ 78°F
Currently in Cedar Rapids
As of 1:30 PM CDT

Records for September 11

🔥 Record High

96°F

September 11, 1931

+20° from 76° normal

❄ Record Low

37°F

September 11, 1917

-17° from 54° normal
🌞 Normal high: 76°F 🌑 Normal low: 54°F 1991–2020 normals

All-Time Records — Cedar Rapids

🔥
110°F
Hottest Day Ever
Jul 6, 1911
❄
-30°F
Coldest Day Ever
Jan 31, 2019
🌧
7.78"
Wettest Day Ever
Sep 15, 1914
☃
12.0"
Most Snow in One Day
Feb 25, 1954

First & Last Dates — Cedar Rapids

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)
207 days
Longest growing season
1900
119 days
Shortest growing season
1929
165 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 96°F September 11, 1931
2 95°F September 11, 2000
3 94°F September 11, 1906
4 94°F September 11, 1895
5 92°F September 11, 1930
6 92°F September 11, 1920
7 92°F September 11, 1908
8 91°F September 11, 1927
9 90°F September 11, 1978
10 90°F September 11, 1953

Top 5 Record Lows — September 11

# Temp Date
🥶 37°F September 11, 1917
2 40°F September 11, 1955
3 40°F September 11, 1940
4 41°F September 11, 1999
5 41°F September 11, 1992
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 — Cedar Rapids

threshold: 93°F (90th percentile of historical Jun–Aug highs)
4.5
Avg heat wave length
days (historical)
99°
Avg peak temp
during heat waves
19
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1893–2026
15
2026 so far
22
Avg/year 1970–2025
14
Avg/year (last 10 complete)
59
Most in a year (1925)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Cedar Rapids

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 9, 1901 – Jul 27, 1901 19 107°F (Jul 21) 100°F 71°F
2 Jul 3, 1936 – Jul 18, 1936 16 109°F (Jul 14) 101°F 69°F
3 Jul 23, 1941 – Aug 3, 1941 12 100°F (Jul 29) 95°F 70°F
4 Jul 23, 1916 – Aug 1, 1916 10 103°F (Jul 27) 100°F 71°F
5 Jun 22, 1931 – Jul 1, 1931 10 103°F (Jun 26) 101°F 72°F
6 Aug 3, 1900 – Aug 12, 1900 10 97°F (Aug 5) 96°F 71°F
7 Aug 30, 1899 – Sep 7, 1899 9 102°F (Sep 5) 96°F 68°F
8 Jul 26, 1955 – Aug 3, 1955 9 102°F (Jul 30) 98°F 74°F
9 Aug 25, 1953 – Sep 2, 1953 9 100°F (Aug 30) 96°F 67°F
10 Jun 18, 1910 – Jun 26, 1910 9 98°F (Jun 19) 96°F 66°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

58
2026 total
above-normal nights
45.3
Avg / summer
1970–2020
70
Most in a summer
1921

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 (1893–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1893, annual totals have trended +0.43" 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 Cedar Rapids is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

28.55"
2026 YTD
Normal: 27.21"
+1.34"
2.11"
September so far
September normal: 3.40"
-1.29"
9
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Cedar Rapids is 1.34" ahead of the normal pace

Period Review — Mar 1 – May 31, 2026

Any window, evaluated against every other year on record — 92 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
52.7°F
Average temperature
8th-warmest of 133
+4.0°
vs. average
Normal: 48.7°F (1991–2020)
9.52"
Precipitation
48th-wettest of 128
-0.37"
vs. average
Normal: 9.89" · 96% of normal

Average Temperature by Year — Mar 1 – May 31

1893–2026 · 2026 highlighted

Precipitation by Year — Mar 1 – May 31

1893–2026 · 2026 highlighted · trend +0.12" per decade (wetter since 1893)

Warmest Mar 1 – May 31 on Record

# Year Avg Temp
1 2012 55.9°F
2 1921 55.2°F
3 1896 54.4°F
4 1977 54.1°F
5 1903 52.9°F
6 1987 52.8°F
7 2025 52.8°F
8 2026 52.7°F
9 1991 52.7°F
10 1946 52.7°F

Coolest Mar 1 – May 31 on Record

# Year Avg Temp
1 1960 42.2°F
2 1975 43.2°F
3 1996 44.8°F
4 1909 44.9°F
5 1907 45.0°F
6 1917 45.2°F
7 1912 45.2°F
8 2008 45.2°F
9 1984 45.2°F
10 1961 45.3°F

Wettest Mar 1 – May 31 on Record

# Year Total
1 2013 18.24"
2 1974 17.59"
3 1959 17.06"
4 1951 16.32"
5 1973 16.11"
6 2008 14.80"
7 1990 14.21"
8 2019 13.54"
9 1986 13.51"
10 1945 13.33"

Driest Mar 1 – May 31 on Record

# Year Total
1 1934 2.52"
2 1988 2.78"
3 1980 3.49"
4 1981 3.79"
5 1926 3.94"
6 1958 4.19"
7 1936 4.20"
8 2023 4.32"
9 1994 4.42"
10 1925 4.70"
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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