S
M
T
W
T
F
S
30
88°
66°
31
87°
62°
1
79°
61°
2
80°
58°
3
80°
61°
4
85°
64°
5
85°
65°
6
78°
65°
7
83°
61°
8
85°
62°
9
86°
61°
10
83°
62°
11
86°
63°
12
85°
62°
13
85°
62°
14
84°
61°
15
85°
53°
16
79°
51°
17
75°
51°
18
75°
52°
19
76°
58°
20
81°
59°
21
79°
58°
22
76°
51°
23
81°
53°
24
82°
53°
25
82°
55°
26
81°
57°
27
81°
57°
28
80°
47°
29
80°
48°
30
70°
53°
1
69°
52°
2
71°
54°
3
70°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Amherst
Amherst's September 2026 forecast shows daily high temperatures ranging from 69° to 88°, with overnight lows between 47° and 66°. The average high for September is 80° with an average low of 57°. 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 Amherst. See also: October | November | December.
