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Lebanon September Weather

Averages and records for weather in Lebanon, New Hampshire in the month of September.

Typical Lebanon September Weather 1991–2020
Average daily high	73.5 °F
Average daily low	48.8 °F
Average monthly precipitation	3.4 inches
Daily chance of precipitation	41.6%

Lebanon September Weather Records 1931–2024
Highest temperature	96 °F	September 2, 1939
Lowest temperature	20 °F	September 24, 1963
Highest daily low	70 °F	September 23, 1965
Lowest daily high	43 °F	September 16, 1959
Hottest average high temperature	78.1 °F	2015
Coldest average high temperature	66.7 °F	1956
Most daily precipitation	4.7 inches	September 16, 1999
Most monthly precipitation	9.2 inches	1938

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	77.7	52.8	95	38
September 2	77.4	52.5	96	36
September 3	77.1	52.2	95	38
September 4	76.8	51.9	93	39
September 5	76.6	51.6	94	34
September 6	76.4	51.3	93	33
September 7	76.2	51.1	92	33
September 8	75.9	50.9	95	37
September 9	75.6	50.6	95	35
September 10	75.4	50.3	94	34
September 11	75.1	50.0	94	29
September 12	74.8	49.7	91	32
September 13	74.6	49.5	89	32
September 14	74.2	49.3	93	28
September 15	73.8	49.0	86	31
September 16	73.4	48.7	90	30
September 17	73.0	48.5	92	30
September 18	72.5	48.1	86	30
September 19	72.0	47.7	89	29
September 20	71.6	47.4	90	28
September 21	71.2	47.1	89	27
September 22	70.7	46.6	90	28
September 23	70.2	46.2	89	27
September 24	69.8	45.7	92	20
September 25	69.5	45.4	90	24
September 26	69.1	45.2	90	22
September 27	68.8	44.9	89	22
September 28	68.3	44.6	84	24
September 29	67.9	44.1	83	24
September 30	67.5	43.7	84	24

Weather Station Details

Years	Station	Coordinates
1962–2024	Lebanon Municipal Airport	location
1931–1961	West Lebanon	location