Waterloo, IA
Iowa · Records since 1895–2026
Records for August 11
🔥 Record High
August 11, 1905
+15° from 84° normal❄ Record Low
August 11, 1982
-19° from 62° normalAll-Time Records — Waterloo
Top 10 Record Highs — August 11
| # | Temp | Date |
|---|---|---|
| 🏆 | 99°F | August 11, 1905 |
| 2 | 98°F | August 11, 1941 |
| 3 | 97°F | August 11, 1923 |
| 4 | 96°F | August 11, 1988 |
| 5 | 95°F | August 11, 1935 |
| 6 | 95°F | August 11, 1899 |
| 7 | 94°F | August 11, 1947 |
| 8 | 94°F | August 11, 1909 |
| 9 | 93°F | August 11, 1995 |
| 10 | 92°F | August 11, 2021 |
Top 5 Record Lows — August 11
| # | Temp | Date |
|---|---|---|
| 🥶 | 43°F | August 11, 1982 |
| 2 | 45°F | August 11, 1986 |
| 3 | 45°F | August 11, 1967 |
| 4 | 46°F | August 11, 2004 |
| 5 | 47°F | August 11, 2012 |
Heat Wave Summary — Waterloo
threshold: 92°F (90th percentile of historical Jun–Aug highs)2026 Daily High Temperature vs Normal
Year to date111 of 221 days with data were above the 1991–2020 normal high for their date.
Days ≥ 90°F Per Year
1895–2026Average Daily High by Decade
Full year · complete decades only
Longest Heat Waves — Waterloo
| # | Dates | Days | Peak | Avg High | Avg Overnight Low |
|---|---|---|---|---|---|
| 🏆 | Jul 9, 1901 – Jul 27, 1901 | 19 | 107°F (Jul 24) | 100°F | 70°F |
| 2 | Jul 3, 1936 – Jul 18, 1936 | 16 | 112°F (Jul 13) | 104°F | 71°F |
| 3 | Jun 22, 1934 – Jul 2, 1934 | 11 | 107°F (Jun 27) | 100°F | 69°F |
| 4 | Jul 21, 1916 – Jul 31, 1916 | 11 | 104°F (Jul 29) | 99°F | 68°F |
| 5 | Jun 22, 1931 – Jul 1, 1931 | 10 | 106°F (Jun 28) | 103°F | 74°F |
| 6 | Jul 26, 1955 – Aug 4, 1955 | 10 | 103°F (Jul 30) | 98°F | 74°F |
| 7 | May 28, 1934 – Jun 5, 1934 | 9 | 108°F (May 31) | 100°F | 66°F |
| 8 | Jul 27, 1988 – Aug 4, 1988 | 9 | 105°F (Jul 31) | 98°F | 68°F |
| 9 | Jul 23, 1919 – Jul 31, 1919 | 9 | 101°F (Jul 27) | 96°F | 68°F |
| 10 | Jul 14, 1931 – Jul 22, 1931 | 9 | 99°F (Jul 17) | 97°F | 67°F |
Heat Waves Per Year
Warm Summer Nights (Jun–Aug)
Nights where the overnight low exceeded the 1991–2020 normal low
Above-Normal Summer Nights Per Year
Average June–August Low by Decade
Overnight lows · complete decades only
Precipitation
Actual vs. 1991–2020 full-month and full-season normals
Monthly Precipitation — Last 24 Months
Blue = actual · dashed line = monthly normal
Annual Precipitation Per Year (1970–2026)
Blue = above average · tan = below average · gold = 2026 (partial)
Heavy Rain Days Per Year (≥ 1.0")
Compare year-to-year changes in days with heavy rainfall (≥ 1.0")
Month in Review — July 2026
Average temperature · July 2026
39th-warmest month on record
27th-warmest July of 132 on record
+2.5° vs. 73.3° average (1991–2020)Longest 90°F Streak in July
4 consecutive days with highs of at least 90°F (Jul 14–17, 2026, peaking at 92°F)
The longest July streak since 2023 (3 years). The July record is 19 days, set in 1901.
Average July Temperature by Year
1895–2026 · 2026 highlighted
Warmest Julys on Record
| # | Year | Avg Temp |
|---|---|---|
| 1 | 1936 | 82.4°F |
| 2 | 1901 | 81.9°F |
| 3 | 1916 | 80.7°F |
| 4 | 2012 | 79.3°F |
| 5 | 1935 | 79.3°F |
| 6 | 1955 | 79.1°F |
| 7 | 1921 | 78.6°F |
| 8 | 1931 | 77.7°F |
| 9 | 1934 | 77.6°F |
| 10 | 2011 | 77.6°F |
Warmest Months on Record (Any Month)
| # | Month | Avg Temp |
|---|---|---|
| 1 | July 1936 | 82.4°F |
| 2 | July 1901 | 81.9°F |
| 3 | July 1916 | 80.7°F |
| 4 | August 1947 | 79.4°F |
| 5 | July 2012 | 79.3°F |
| 6 | July 1935 | 79.3°F |
| 7 | July 1955 | 79.1°F |
| 8 | July 1921 | 78.6°F |
| 9 | June 1934 | 78.4°F |
| 10 | August 1936 | 78.2°F |
Nearby Stations — July 2026
How the same month ranked at the closest reporting stations
| Station | Avg Temp | July Rank |
|---|---|---|
| Waterloo, IA | 75.8°F | 27th of 132 |
| Cedar Rapids, IA | 75.5°F | 43rd of 132 |
| Dubuque, IA | 75.3°F | 41st of 151 |
| Des Moines, IA | 78.4°F | 29th of 148 |
| Rochester, MN | 74.2°F | 11th of 113 |