Chicago, IL
Illinois · Records since 1872–2026
Records for August 11
🔥 Record High
August 11, 1941
+15° from 83° normal❄ Record Low
August 11, 1982
-19° from 66° normalAll-Time Records — Chicago
Top 10 Record Highs — August 11
| # | Temp | Date |
|---|---|---|
| 🏆 | 98°F | August 11, 1941 |
| 2 | 98°F | August 11, 1874 |
| 3 | 96°F | August 11, 1944 |
| 4 | 95°F | August 11, 1947 |
| 5 | 94°F | August 11, 1975 |
| 6 | 94°F | August 11, 1943 |
| 7 | 93°F | August 11, 2002 |
| 8 | 93°F | August 11, 1995 |
| 9 | 92°F | August 11, 2016 |
| 10 | 92°F | August 11, 1988 |
Top 5 Record Lows — August 11
| # | Temp | Date |
|---|---|---|
| 🥶 | 47°F | August 11, 1982 |
| 2 | 51°F | August 11, 1965 |
| 3 | 53°F | August 11, 2004 |
| 4 | 54°F | August 11, 1991 |
| 5 | 54°F | August 11, 1986 |
Heat Wave Summary — Chicago
threshold: 91°F (90th percentile of historical Jun–Aug highs)2026 Daily High Temperature vs Normal
Year to date114 of 222 days with data were above the 1991–2020 normal high for their date.
Days ≥ 90°F Per Year
1872–2026Average 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
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
28th-warmest month on record
22nd-warmest July of 155 on record
+2.2° vs. 74.6° average (1991–2020)Longest 90°F Streak in July
6 consecutive days with highs of at least 90°F (Jul 13–18, 2026, peaking at 96°F)
The longest July streak since 2012 (14 years). The July record is 10 days, set in 1987.
Average July Temperature by Year
1872–2026 · 2026 highlighted
Warmest Julys on Record
| # | Year | Avg Temp |
|---|---|---|
| 1 | 1955 | 81.3°F |
| 2 | 1921 | 81.2°F |
| 3 | 2012 | 81.0°F |
| 4 | 2020 | 79.2°F |
| 5 | 2011 | 79.1°F |
| 6 | 1916 | 78.5°F |
| 7 | 1977 | 78.5°F |
| 8 | 1999 | 78.3°F |
| 9 | 1966 | 78.3°F |
| 10 | 1949 | 77.9°F |
Warmest Months on Record (Any Month)
| # | Month | Avg Temp |
|---|---|---|
| 1 | July 1955 | 81.3°F |
| 2 | July 1921 | 81.2°F |
| 3 | July 2012 | 81.0°F |
| 4 | August 1947 | 80.2°F |
| 5 | July 2020 | 79.2°F |
| 6 | July 2011 | 79.1°F |
| 7 | August 1995 | 79.0°F |
| 8 | August 1955 | 78.7°F |
| 9 | August 1959 | 78.7°F |
| 10 | July 1916 | 78.5°F |
Nearby Stations — July 2026
How the same month ranked at the closest reporting stations
| Station | Avg Temp | July Rank |
|---|---|---|
| Chicago, IL | 76.8°F | 22nd of 155 |
| South Bend, IN | 74.8°F | 32nd of 131 |
| Rockford, IL | 74.9°F | 46th of 128 |
| Milwaukee, WI | 75.0°F | 15th of 156 |
| Holland, MI | 73.4°F | 25th of 118 |