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Williamsport September Weather

Averages and records for weather in Williamsport, Pennsylvania in the month of September.

Typical Williamsport September Weather 1991–2020
Average daily high	75.4 °F
Average daily low	54.1 °F
Average monthly precipitation	4.8 inches
Average monthly snow	none
Daily chance of precipitation	33.3%
Daily chance of snow	0%

Williamsport September Weather Records 1895–2024
Highest temperature	102 °F	September 3, 1953
Lowest temperature	30 °F	September 24, 1963
Highest daily low	73 °F	September 9, 2016
Lowest daily high	48 °F	September 28, 1984
Hottest average high temperature	83.4 °F	1931
Coldest average high temperature	68.3 °F	1975
Most daily precipitation	6.8 inches	September 7, 2011
Most monthly precipitation	16.0 inches	2011
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
September 1	79.9	58.4	100	45
September 2	79.6	58.2	101	41
September 3	79.4	57.9	102	42
September 4	79.2	57.6	94	44
September 5	79.0	57.3	95	43
September 6	78.7	57.0	94	40
September 7	78.5	56.9	95	39
September 8	78.2	56.6	94	41
September 9	77.9	56.3	95	41
September 10	77.6	55.9	99	37
September 11	77.2	55.5	98	35
September 12	76.8	55.2	100	35
September 13	76.6	54.9	96	36
September 14	76.2	54.7	92	35
September 15	75.7	54.4	92	35
September 16	75.3	54.0	92	38
September 17	74.9	53.6	90	35
September 18	74.5	53.2	88	34
September 19	74.1	52.8	87	34
September 20	73.7	52.5	90	34
September 21	73.3	52.2	94	33
September 22	72.8	51.7	97	31
September 23	72.4	51.3	91	32
September 24	72.1	50.9	92	30
September 25	71.8	50.6	91	31
September 26	71.5	50.3	92	31
September 27	71.2	50.0	91	32
September 28	70.7	49.6	90	32
September 29	70.3	49.1	84	31
September 30	69.9	48.7	93	31

Weather Station Details

Years	Station	Coordinates
1948–2024	Williamsport	location
1895–1947	Williamsport	location