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°
50°
9
83°
60°
10
87°
65°
11
80°
51°
12
79°
47°
13
74°
63°
14
75°
48°
15
73°
43°
16
80°
51°
17
81°
62°
18
80°
60°
19
66°
49°
20
62°
54°
21
69°
52°
22
68°
45°
23
67°
41°
24
70°
43°
25
72°
53°
26
65°
55°
27
64°
50°
28
66°
50°
29
73°
49°
30
69°
51°
1
73°
50°
2
72°
50°
3
70°
49°
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 64° to 73°, with overnight lows between 41° and 55°. The average high for September is 69° with an average low of 49°. 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.
