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Ottawa July Weather

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

Typical Ottawa July Weather 1991–2020
Average daily high	84.3 °F
Average daily low	64.4 °F
Average monthly precipitation	3.6 inches
Average monthly snow	none
Daily chance of precipitation	27.0%
Daily chance of snow	0%

Ottawa July Weather Records 1892–2024
Highest temperature	112 °F	July 14, 1936
Lowest temperature	39 °F	July 19, 1920
Highest daily low	81 °F	July 18, 1942
Lowest daily high	63 °F	July 6, 1909
Hottest average high temperature	98.6 °F	1936
Coldest average high temperature	78.0 °F	2009
Most daily precipitation	8.8 inches	July 14, 1958
Most monthly precipitation	14.9 inches	1958
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	83.6	63.4	103	45
July 2	83.7	63.6	98	46
July 3	83.8	63.7	101	45
July 4	83.9	63.9	102	45
July 5	84.0	64.0	103	47
July 6	84.1	64.1	105	47
July 7	84.2	64.3	105	49
July 8	84.3	64.4	106	44
July 9	84.3	64.5	104	50
July 10	84.3	64.4	108	47
July 11	84.3	64.4	108	47
July 12	84.4	64.4	109	49
July 13	84.4	64.5	110	47
July 14	84.4	64.5	112	46
July 15	84.4	64.5	105	50
July 16	84.4	64.5	103	47
July 17	84.4	64.5	104	42
July 18	84.5	64.5	102	45
July 19	84.6	64.5	106	39
July 20	84.6	64.5	106	47
July 21	84.6	64.4	112	48
July 22	84.5	64.3	106	46
July 23	84.4	64.2	108	45
July 24	84.3	64.2	109	50
July 25	84.3	64.1	107	50
July 26	84.2	64.2	105	49
July 27	84.2	64.1	106	46
July 28	84.2	64.0	107	51
July 29	84.1	63.9	105	47
July 30	84.0	63.9	108	46
July 31	83.8	63.7	104	44

Weather Station Details

Years	Station	Coordinates
1892–2024	Ottawa 5SW	location