Average Temperatures for New Hampshire in September

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Average temperatures for September at cities, towns, parks and lakes throughout New Hampshire are listed below in degrees Fahrenheit and Celsius.

The tables give the normals for maximum and minimum monthly temperatures based on weather data collected from 1981 to 2010.

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

Southern New Hampshire

Average September temperatures
High °F Low °F Place High °C Low °C
73 47 Concord 23   9
73 50 Durham 23 10
72 46 Franklin Falls Reservoir Dam 22   8
73 47 Keene 23   8
72 51 Laconia & Lakeport 22 11
72 48 Lebanon 22   9
73 51 Massabesic Lake 23 10
69 50 Mount Sunapee 20 10
73 49 Nashua 23 10
73 50 Portsmouth & Greenland 23 10
72 46 Surry Mountain Lake 22   8

Northern New Hampshire

Average daily temperatures in September
High °F Low °F Place High °C Low °C
69 45 Berlin 21   7
70 42 Bethlehem 21   6
67 43 Colebrook 20   6
65 42 First Connecticut Lake 19   6
47 36 Mount Washington   8   2
70 46 North Conway 21   8
66 45 Pinkham Notch 19   7
70 44 Plymouth 21   6
69 43 Tamworth 21   6
Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

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