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Decatur July Weather

Averages and records for weather in Decatur, Illinois in the month of July.

Typical Decatur July Weather 1991–2020
Average daily high	86.2 °F
Average daily low	66.7 °F
Average monthly precipitation	4.1 inches
Average monthly snow	none
Daily chance of precipitation	30.5%
Daily chance of snow	0%

Decatur July Weather Records 1893–2024
Highest temperature	113 °F	July 14, 1954
Lowest temperature	45 °F	July 17, 2009
Highest daily low	80 °F	July 22, 2011
Lowest daily high	65 °F	July 6, 1909
Hottest average high temperature	98.9 °F	1936
Coldest average high temperature	79.3 °F	2014
Most daily precipitation	5.1 inches	July 26, 1992
Most monthly precipitation	16.7 inches	1992
Most daily snow	none	-
Most monthly snow	none	-

Note: Daily averages are a moving average which includes 14 days before and after

Day	Average (°F)		Record (°F)
Day	High	Low	High	Low
July 1	85.8	65.8	106	48
July 2	85.8	65.8	105	45
July 3	85.9	65.9	102	48
July 4	86.0	66.1	104	46
July 5	86.1	66.2	104	49
July 6	86.1	66.3	105	47
July 7	86.2	66.4	106	48
July 8	86.2	66.5	106	47
July 9	86.3	66.5	103	48
July 10	86.2	66.5	106	47
July 11	86.3	66.5	107	46
July 12	86.3	66.6	108	49
July 13	86.3	66.7	108	46
July 14	86.3	66.7	113	47
July 15	86.3	66.7	108	45
July 16	86.2	66.7	101	51
July 17	86.3	66.7	103	45
July 18	86.3	66.8	108	47
July 19	86.3	66.7	104	48
July 20	86.3	66.7	104	51
July 21	86.2	66.7	106	48
July 22	86.1	66.6	109	46
July 23	86.0	66.5	106	49
July 24	85.9	66.5	107	50
July 25	85.8	66.4	104	51
July 26	85.8	66.4	104	48
July 27	85.9	66.4	108	49
July 28	85.7	66.3	107	51
July 29	85.7	66.2	104	50
July 30	85.6	66.2	103	52
July 31	85.4	66.0	105	50

Weather Station Details

Years	Station	Coordinates
1893–2024	Decatur WTP	location