Chicago, IL
Illinois · Records since 1872–2026
🌤️ 76°F
Feels like 82°
Currently in Chicago
As of 5:45 PM CDT
Records for July 27
🔥 Record High
100°F
July 27, 1955
+16° from 84° normal❄ Record Low
52°F
July 27, 1985
-15° from 67° normal
🌞 Normal high: 84°F 🌑 Normal low: 67°F 1991–2020 normals
All-Time Records — Chicago
105°F
Hottest Day Ever
Jul 24, 1934
-27°F
Coldest Day Ever
Jan 20, 1985
6.86"
Wettest Day Ever
Jul 23, 2011
18.6"
Most Snow in One Day
Jan 2, 1999
Top 10 Record Highs — July 27
| # | Temp | Date |
|---|---|---|
| 🏆 | 100°F | July 27, 1955 |
| 2 | 100°F | July 27, 1916 |
| 3 | 96°F | July 27, 1941 |
| 4 | 96°F | July 27, 1930 |
| 5 | 96°F | July 27, 1919 |
| 6 | 95°F | July 27, 1952 |
| 7 | 95°F | July 27, 1901 |
| 8 | 94°F | July 27, 1913 |
| 9 | 94°F | July 27, 1887 |
| 10 | 93°F | July 27, 1989 |
Top 5 Record Lows — July 27
| # | Temp | Date |
|---|---|---|
| 🥶 | 52°F | July 27, 1985 |
| 2 | 54°F | July 27, 1971 |
| 3 | 55°F | July 27, 2013 |
| 4 | 55°F | July 27, 1991 |
| 5 | 55°F | July 27, 1984 |
Heat Wave Summary — Chicago
threshold: 91°F (90th percentile of historical Jun–Aug highs)3.9
Avg heat wave length
days (historical)
96°
Avg peak temp
during heat waves
14
Dangerous nights 2026
Overnights ≥ 70°F
2
Heat waves 2026
so far
2026 Daily High Temperature vs Normal
Year to date
Above normal
Below normal
107 of 207 days with data were above the 1991–2020 normal high for their date.
Days ≥ 90°F Per Year
1872–202612
2026 so far
16
Avg/year 1970–2025
21
Avg/year (last 10 complete)
47
Most in a year (1988)
Average Daily High by Decade
Full year · complete decades only
Longest Heat Waves — Chicago
| # | Dates | Days | Peak | Avg High | Avg Overnight Low |
|---|---|---|---|---|---|
| 🏆 | Aug 25, 1953 – Sep 3, 1953 | 10 | 101°F (Sep 1) | 98°F | 71°F |
| 2 | Jul 26, 1955 – Aug 4, 1955 | 10 | 100°F (Jul 27) | 96°F | 76°F |
| 3 | Aug 19, 1959 – Aug 28, 1959 | 10 | 96°F (Aug 21) | 94°F | 74°F |
| 4 | Jul 27, 1988 – Aug 4, 1988 | 9 | 100°F (Aug 1) | 97°F | 72°F |
| 5 | Jul 17, 1987 – Jul 25, 1987 | 9 | 96°F (Jul 20) | 93°F | 71°F |
| 6 | Jun 30, 2012 – Jul 7, 2012 | 8 | 103°F (Jul 5) | 98°F | 75°F |
| 7 | Aug 17, 1947 – Aug 24, 1947 | 8 | 100°F (Aug 24) | 97°F | 74°F |
| 8 | Aug 22, 1948 – Aug 29, 1948 | 8 | 98°F (Aug 24) | 95°F | 72°F |
| 9 | May 16, 1977 – May 23, 1977 | 8 | 95°F (May 20) | 92°F | 70°F |
| 10 | Aug 4, 1900 – Aug 11, 1900 | 8 | 94°F (Aug 4) | 93°F | 75°F |
Heat Waves Per Year
Warm Summer Nights (Jun–Aug)
Nights where the overnight low exceeded the 1991–2020 normal low
29
2026 so far
above-normal nights
35.8
Avg / summer
1970–2020
72
Most in a summer
1921
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
24.15"
2026 YTD
Normal: 21.81"
+2.34"
3.56"
July so far
July normal: 3.71"
-0.15"
8.56"
Summer so far
Summer normal: 12.06"
-3.50"
7
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")