Average September Temperatures for New Hampshire

Average Temperatures for New Hampshire in September

Average temperatures for September at cities, communities and other locations around around New Hampshire are listed below in degrees Fahrenheit and Celsius.

You can jump to a separate table for Southern and Northern New Hampshire.

The tables give the normals for maximum and minimum temperatures based on weather data collected from 1991 to 2020 by the US National Centers for Environmental Information.

Southern New Hampshire

Average September temperatures
High °F	Low °F	Place	High °C	Low °C
74	49	Concord	23	9
73	50	Durham	23	10
72	48	Franklin Falls Reservoir Dam	22	9
73	47	Keene	23	8
73	52	Laconia & Lakeport	23	11
73	49	Lebanon	23	9
73	52	Massabesic Lake	23	11
70	50	Mount Sunapee	21	10
75	51	Nashua	24	11
72	52	Portsmouth & Greenland	22	11
73	50	Rochester	23	10

Northern New Hampshire

Average daily temperatures in September
High °F	Low °F	Place	High °C	Low °C
70	45	Berlin	21	7
72	42	Bethlehem	22	6
68	43	Colebrook	20	6
66	44	First Connecticut Lake	19	7
49	37	Mount Washington	10	3
72	48	North Conway	22	9
68	45	Pinkham Notch	20	7
72	45	Plymouth	22	7
70	44	Tamworth	21	7

Reference

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

Average Temperatures for New Hampshire in September

Southern New Hampshire

Northern New Hampshire

Reference

More New Hampshire Weather Information