S
M
T
W
T
F
S
30
80°
52°
31
76°
66°
1
77°
66°
2
73°
65°
3
83°
70°
4
84°
63°
5
79°
59°
6
72°
52°
7
79°
47°
8
81°
59°
9
80°
69°
10
81°
62°
11
78°
53°
12
76°
59°
13
81°
68°
14
82°
65°
15
79°
69°
16
78°
63°
17
76°
63°
18
75°
61°
19
74°
59°
20
73°
57°
21
72°
58°
22
69°
62°
23
70°
61°
24
70°
61°
25
71°
59°
26
73°
59°
27
70°
55°
28
69°
59°
29
74°
60°
30
75°
60°
1
75°
59°
2
74°
60°
3
72°
58°
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 69° to 82°, with overnight lows between 53° and 69°. The average high for September is 75° with an average low of 61°. 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.
