Waterloo, IA
Iowa · Records since 1895–2026
☀️ 88°F
Feels like 97°
Currently in Waterloo
As of 7:00 PM CDT
Records for July 28
🔥 Record High
103°F
July 28, 1916
+18° from 85° normal❄ Record Low
45°F
July 28, 1925
-19° from 64° normal
🌞 Normal high: 85°F 🌑 Normal low: 64°F 1991–2020 normals
All-Time Records — Waterloo
112°F
Hottest Day Ever
Jul 14, 1936
-34°F
Coldest Day Ever
Jan 16, 2009
6.00"
Wettest Day Ever
Sep 8, 1941
14.0"
Most Snow in One Day
Nov 30, 1934
Top 10 Record Highs — July 28
| # | Temp | Date |
|---|---|---|
| 🏆 | 103°F | July 28, 1916 |
| 2 | 102°F | July 28, 1917 |
| 3 | 99°F | July 28, 1955 |
| 4 | 98°F | July 28, 2023 |
| 5 | 97°F | July 28, 1931 |
| 6 | 96°F | July 28, 1988 |
| 7 | 95°F | July 28, 1964 |
| 8 | 95°F | July 28, 1952 |
| 9 | 95°F | July 28, 1941 |
| 10 | 95°F | July 28, 1936 |
Top 5 Record Lows — July 28
| # | Temp | Date |
|---|---|---|
| 🥶 | 45°F | July 28, 1925 |
| 2 | 49°F | July 28, 1965 |
| 3 | 49°F | July 28, 1928 |
| 4 | 50°F | July 28, 2013 |
| 5 | 50°F | July 28, 2005 |
Heat Wave Summary — Waterloo
threshold: 92°F (90th percentile of historical Jun–Aug highs)4.5
Avg heat wave length
days (historical)
98°
Avg peak temp
during heat waves
6
Dangerous nights 2026
Overnights ≥ 70°F
0
Heat waves 2026
so far
2026 Daily High Temperature vs Normal
Year to date
Above normal
Below normal
108 of 207 days with data were above the 1991–2020 normal high for their date.
Days ≥ 90°F Per Year
1895–20268
2026 so far
21
Avg/year 1970–2025
22
Avg/year (last 10 complete)
60
Most in a year (1936)
Average 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
28
2026 so far
above-normal nights
36.3
Avg / summer
1970–2020
56
Most in a summer
1943
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
24.31"
2026 YTD
Normal: 22.29"
+2.02"
5.24"
July so far
July normal: 4.34"
+0.90"
11.15"
Summer so far
Summer normal: 14.23"
-3.08"
9
2026 heavy rain days
Days with ≥ 1.0"
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")