Illinois

Cities

• Fall 2026 so far averaged 76.8°F in Carbondale, IL (1 day missing), the warmest 1 September to 3 October since 1925 (1948 excluded: 17 of 33 days missing; 1984 excluded: 33 of 33 days missing; 1985 excluded: 5 of 33 days missing; 2 more years excluded for missing days), 3rd warmest of 115.
• 2026 so far brought 36.08 in of precipitation in Chicago, IL, the wettest 1 January to 3 October since 2019, tied 7th wettest of 156 (with 1983).
• Fall 2026 so far brought 8.78 in of precipitation in Moline, IL, the wettest 1 September to 3 October since 2008, 8th wettest of 155.
• 2026 so far averaged 58°F in Peoria, IL (2 days missing), the warmest 1 January to 3 October since 2024, 10th warmest of 142.
• October 2026 so far brought 1.14 in of precipitation in Quincy, IL, the wettest 1 to 3 October since 2014, 12th wettest of 126.
• October 2026 so far brought 1.35 in of precipitation in Rockford, IL, the wettest 1 to 3 October since 2018, 7th wettest of 125.
• Fall 2026 so far averaged 73.4°F in Springfield, IL, the warmest 1 September to 3 October since 1933, 4th warmest of 148.

Counties

Records set this year

• RecordFriday 18 September 2026: a high of 99°F in Carbondale, IL, the warmest 18 September on record, in 122 years since 1899 (no value for 1905, 1906, 1907 and 3 other years); provisional, awaiting the National Weather Service report.
• RecordThursday 17 September 2026: a high of 98°F in Springfield, IL, the warmest 17 September on record, in 148 years since 1879; provisional, awaiting the National Weather Service report.
• RecordThursday 7 May 2026: a low of 27°F in Rockford, IL, the coldest 7 May night on record, in 127 years since 1893 (no value for 1894, 1899, 1900 and 4 other years); provisional, awaiting the National Weather Service report.
• RecordSaturday 2 May 2026: a low of 27°F in Rockford, IL, the coldest 2 May night on record, in 127 years since 1893 (no value for 1894, 1899, 1900 and 4 other years); provisional, awaiting the National Weather Service report.
• RecordTuesday 14 April 2026: a high of 86°F in Carbondale, IL, the warmest 14 April on record, in 121 years since 1899 (no value for 1904, 1905, 1906 and 4 other years); provisional, awaiting the National Weather Service report.
• RecordTuesday 31 March 2026: a high of 83°F in Quincy, IL, the warmest 31 March on record, in 124 years since 1901 (no value for 1911 and 1919); provisional, awaiting the National Weather Service report.
• RecordTuesday 31 March 2026: a high of 85°F in Carbondale, IL, the warmest 31 March on record, in 119 years since 1899 (no value for 1904, 1905, 1906 and 6 other years); provisional, awaiting the National Weather Service report.
• RecordMonday 30 March 2026: a high of 84°F in Springfield, IL, the warmest 30 March on record, in 147 years since 1880; provisional, awaiting the National Weather Service report.
• RecordMonday 30 March 2026: a high of 85°F in Quincy, IL, the warmest 30 March on record, in 125 years since 1901 (no value for 1911); provisional, awaiting the National Weather Service report.
• RecordMonday 30 March 2026: a high of 85°F in Moline, IL, the warmest 30 March on record, in 153 years since 1874; provisional, awaiting the National Weather Service report.
• RecordMonday 30 March 2026: a high of 81°F in Chicago, IL, the warmest 30 March on record, in 154 years since 1873; provisional, awaiting the National Weather Service report.
• RecordThursday 26 March 2026: a high of 92°F in Springfield, IL, the warmest 26 March on record, in 147 years since 1880; provisional, awaiting the National Weather Service report.
• RecordThursday 26 March 2026: a high of 89°F in Quincy, IL, the warmest 26 March on record, in 126 years since 1901; provisional, awaiting the National Weather Service report.
• RecordThursday 26 March 2026: a high of 87°F in Peoria, IL, the warmest 26 March on record, in 143 years since 1884; provisional, awaiting the National Weather Service report.
• RecordSaturday 21 March 2026: a high of 86°F in Moline, IL, the warmest 21 March on record, in 153 years since 1874; provisional, awaiting the National Weather Service report.
• RecordSaturday 21 March 2026: a high of 86°F in Carbondale, IL, the warmest 21 March on record, in 119 years since 1899 (no value for 1904, 1905, 1906 and 6 other years); provisional, awaiting the National Weather Service report.
• RecordFriday 20 March 2026: a high of 85°F in Springfield, IL, the warmest 20 March on record, in 147 years since 1880; provisional, awaiting the National Weather Service report.
• RecordFriday 20 March 2026: a high of 84°F in Quincy, IL, the warmest 20 March on record, in 126 years since 1901; provisional, awaiting the National Weather Service report.
• RecordFriday 20 March 2026: a high of 85°F in Carbondale, IL, the warmest 20 March on record, in 119 years since 1899 (no value for 1904, 1905, 1906 and 6 other years); provisional, awaiting the National Weather Service report.
• RecordTuesday 10 March 2026: a high of 84°F in Springfield, IL, the warmest 10 March on record, in 147 years since 1880; provisional, awaiting the National Weather Service report.
• RecordTuesday 10 March 2026: a high of 85°F in Quincy, IL, the warmest 10 March on record, in 126 years since 1901; provisional, awaiting the National Weather Service report.
• RecordTuesday 10 March 2026: a high of 83°F in Peoria, IL, the warmest 10 March on record, in 143 years since 1884; provisional, awaiting the National Weather Service report.
• RecordMonday 9 March 2026: a high of 76°F in Springfield, IL, the warmest 9 March on record, in 147 years since 1880; provisional, awaiting the National Weather Service report.
• RecordMonday 9 March 2026: a high of 73°F in Rockford, IL, the warmest 9 March on record, in 124 years since 1893 (no value for 1894, 1895, 1899 and 7 other years); provisional, awaiting the National Weather Service report.
• RecordMonday 9 March 2026: a high of 78°F in Quincy, IL, the warmest 9 March on record, in 126 years since 1901; provisional, awaiting the National Weather Service report.
• RecordMonday 9 March 2026: a high of 76°F in Peoria, IL, the warmest 9 March on record, in 143 years since 1884; provisional, awaiting the National Weather Service report.
• RecordMonday 9 March 2026: a high of 75°F in Moline, IL, the warmest 9 March on record, in 153 years since 1874; provisional, awaiting the National Weather Service report.
• RecordMonday 9 March 2026: a high of 73°F in Chicago, IL, the warmest 9 March on record, in 154 years since 1873; provisional, awaiting the National Weather Service report.
• RecordFriday 6 March 2026: a high of 77°F in Peoria, IL, the warmest 6 March on record, in 143 years since 1883 (no value for 1901); provisional, awaiting the National Weather Service report.
• RecordMonday 16 February 2026: a high of 66°F in Rockford, IL, the warmest 16 February on record, in 124 years since 1893 (no value for 1894, 1895, 1899 and 7 other years); provisional, awaiting the National Weather Service report.
• RecordMonday 16 February 2026: a high of 67°F in Peoria, IL, the warmest 16 February on record, in 143 years since 1883 (no value for 1900); provisional, awaiting the National Weather Service report.
• RecordMonday 16 February 2026: a high of 70°F in Moline, IL, the warmest 16 February on record, in 153 years since 1874; provisional, awaiting the National Weather Service report.
• RecordMonday 16 February 2026: a high of 65°F in Chicago, IL, the warmest 16 February on record, in 154 years since 1873; provisional, awaiting the National Weather Service report.
• RecordMonday 26 January 2026: a low of -13°F in Springfield, IL, the coldest 26 January night on record, in 147 years since 1880; provisional, awaiting the National Weather Service report.
• RecordFriday 9 January 2026: a high of 64°F in Springfield, IL, the warmest 9 January on record, in 147 years since 1880; provisional, awaiting the National Weather Service report.
• RecordFriday 9 January 2026: a high of 58°F in Rockford, IL, the warmest 9 January on record, in 122 years since 1893 (no value for 1894, 1895, 1899 and 9 other years); provisional, awaiting the National Weather Service report.
• RecordFriday 9 January 2026: a high of 68°F in Carbondale, IL, the warmest 9 January on record, in 117 years since 1899 (no value for 1901, 1904, 1905 and 8 other years); provisional, awaiting the National Weather Service report.
• RecordThursday 8 January 2026: a high of 65°F in Springfield, IL, the warmest 8 January on record, in 147 years since 1880; provisional, awaiting the National Weather Service report.
• RecordThursday 8 January 2026: a high of 59°F in Rockford, IL, the warmest 8 January on record, in 123 years since 1893 (no value for 1894, 1895, 1899 and 8 other years); provisional, awaiting the National Weather Service report.
• RecordThursday 8 January 2026: a high of 62°F in Peoria, IL, the warmest 8 January on record, in 143 years since 1883 (no value for 1901); provisional, awaiting the National Weather Service report.
• RecordThursday 8 January 2026: a high of 69°F in Carbondale, IL, the warmest 8 January on record, in 117 years since 1899 (no value for 1901, 1904, 1905 and 8 other years); provisional, awaiting the National Weather Service report.

Records set this year not listed

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