< Previous Month Next Month >

Mt. Washington September Weather

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

Typical Mt. Washington September Weather 1991–2020
Average daily high	48.7 °F
Average daily low	37.0 °F
Average monthly precipitation	7.7 inches
Average monthly snow	1.2 inches
Daily chance of precipitation	46.3%
Daily chance of snow	4.3%

Mt. Washington September Weather Records 1948–2024
Highest temperature	69 °F	September 3, 1999
Lowest temperature	9 °F	September 30, 1992
Highest daily low	57 °F	September 26, 2017
Lowest daily high	15 °F	September 30, 1992
Hottest average high temperature	55.3 °F	2015
Coldest average high temperature	41.8 °F	1962
Most daily precipitation	5.1 inches	September 16, 1999
Most monthly precipitation	18.8 inches	1999
Most daily snow	7.7 inches	September 16, 1986
Most monthly snow	7.8 inches	1949

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	51.7	40.6	66	22
September 2	51.5	40.4	65	23
September 3	51.4	40.2	69	25
September 4	51.2	40.0	66	23
September 5	51.0	39.7	66	23
September 6	50.9	39.5	63	22
September 7	50.8	39.4	65	25
September 8	50.7	39.2	65	16
September 9	50.4	38.9	68	21
September 10	50.0	38.5	66	22
September 11	49.8	38.2	63	23
September 12	49.5	38.0	60	21
September 13	49.4	37.8	65	21
September 14	49.2	37.6	60	18
September 15	48.9	37.3	62	19
September 16	48.6	36.9	64	15
September 17	48.3	36.6	63	17
September 18	48.0	36.2	60	19
September 19	47.7	35.8	65	14
September 20	47.3	35.5	60	15
September 21	46.9	35.1	64	15
September 22	46.5	34.6	63	17
September 23	46.2	34.3	62	15
September 24	45.9	34.0	65	12
September 25	45.7	33.7	64	12
September 26	45.4	33.5	67	12
September 27	45.1	33.2	62	13
September 28	44.7	32.8	61	12
September 29	44.4	32.4	56	14
September 30	44.1	32.0	59	9

Weather Station Details

Years	Station	Coordinates
1948–2024	Mt. Washington	location