S
M
T
W
T
F
S
30
84°
54°
31
79°
57°
1
69°
62°
2
79°
61°
3
82°
62°
4
85°
59°
5
80°
53°
6
78°
52°
7
81°
46°
8
82°
55°
9
81°
67°
10
85°
58°
11
77°
45°
12
78°
54°
13
81°
57°
14
80°
56°
15
76°
60°
16
76°
50°
17
73°
51°
18
70°
51°
19
70°
46°
20
68°
48°
21
70°
47°
22
66°
52°
23
67°
51°
24
68°
51°
25
70°
49°
26
71°
48°
27
67°
43°
28
67°
47°
29
72°
50°
30
73°
50°
1
72°
49°
2
71°
50°
3
69°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Northampton
Northampton's September 2026 forecast shows daily high temperatures ranging from 66° to 85°, with overnight lows between 43° and 67°. The average high for September is 73° with an average low of 51°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Northampton. See also: October | November | December.
