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McKinney September Weather

Averages and records for weather in McKinney, Texas in the month of September.

Typical McKinney September Weather 1991–2020
Average daily high	88.5 °F
Average daily low	65.2 °F
Average monthly precipitation	2.9 inches
Daily chance of precipitation	21.2%

McKinney September Weather Records 1903–2024
Highest temperature	112 °F	September 4, 2000
Lowest temperature	39 °F	September 22, 1983
Highest daily low	85 °F	September 16, 1997
Lowest daily high	57 °F	September 26, 1984
Hottest average high temperature	97.8 °F	1939
Coldest average high temperature	77.9 °F	1974
Most daily precipitation	12.1 inches	September 21, 1964
Most monthly precipitation	21.6 inches	1964

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

Day	Average (°F)		Record (°F)
Day	High	Low	High	Low
September 1	92.3	69.7	108	53
September 2	92.1	69.5	110	56
September 3	91.9	69.3	109	55
September 4	91.7	69.1	112	50
September 5	91.5	68.9	108	49
September 6	91.2	68.6	107	48
September 7	90.9	68.4	107	51
September 8	90.6	68.1	108	54
September 9	90.3	67.7	103	51
September 10	90.0	67.4	100	54
September 11	89.7	67.1	101	51
September 12	89.4	66.7	101	54
September 13	89.1	66.4	107	50
September 14	88.9	65.9	103	51
September 15	88.5	65.5	102	48
September 16	88.3	65.1	100	46
September 17	88.1	64.7	101	46
September 18	87.9	64.4	102	46
September 19	87.7	64.0	103	43
September 20	87.4	63.7	102	43
September 21	87.1	63.4	100	42
September 22	86.7	63.1	100	39
September 23	86.4	62.7	101	44
September 24	86.1	62.3	100	43
September 25	85.7	62.0	102	41
September 26	85.3	61.6	101	41
September 27	85.0	61.2	102	39
September 28	84.8	60.9	106	44
September 29	84.4	60.5	101	42
September 30	84.2	60.1	100	39

Weather Station Details

Years	Station	Coordinates
1999–2024	McKinney Municipal Airport	location
1903–1998	McKinney Municipal Airport	location