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Jacksonville May Weather

Averages and records for weather in Jacksonville, Illinois in the month of May.

Typical Jacksonville May Weather 1991–2020
Average daily high	74.8 °F
Average daily low	51.3 °F
Average monthly precipitation	4.8 inches
Average monthly snow	none
Daily chance of precipitation	43.0%
Daily chance of snow	0%

Jacksonville May Weather Records 1895–2024
Highest temperature	103 °F	May 31, 1934
Lowest temperature	26 °F	May 10, 1966
Highest daily low	75 °F	May 26, 1953
Lowest daily high	42 °F	May 7, 1989
Hottest average high temperature	84.0 °F	2018
Coldest average high temperature	68.1 °F	1967
Most daily precipitation	4.8 inches	May 1, 1970
Most monthly precipitation	12.3 inches	1935
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
May 1	69.8	45.9	89	28
May 2	70.1	46.2	90	30
May 3	70.4	46.5	93	30
May 4	70.6	46.8	91	29
May 5	70.8	47.0	93	29
May 6	71.2	47.4	91	30
May 7	71.5	47.8	91	29
May 8	71.7	48.1	91	33
May 9	72.1	48.5	93	31
May 10	72.5	48.8	96	26
May 11	72.9	49.2	90	32
May 12	73.1	49.7	94	30
May 13	73.5	50.2	94	34
May 14	74.0	50.6	91	32
May 15	74.4	51.0	91	33
May 16	74.8	51.4	90	32
May 17	75.2	51.7	92	34
May 18	75.5	52.0	92	34
May 19	76.0	52.4	91	34
May 20	76.3	52.7	93	38
May 21	76.4	53.1	94	32
May 22	76.6	53.3	93	33
May 23	76.8	53.4	92	34
May 24	77.0	53.7	94	39
May 25	77.3	53.9	93	29
May 26	77.6	54.2	94	33
May 27	77.9	54.5	92	33
May 28	78.2	54.9	94	33
May 29	78.5	55.4	95	36
May 30	79.0	55.8	98	37
May 31	79.3	56.1	103	36

Weather Station Details

Years	Station	Coordinates
1895–2024	Jacksonville 2E	location