S
M
T
W
T
F
S
30
73°
51°
31
70°
53°
1
71°
49°
2
72°
46°
3
71°
59°
4
66°
59°
5
60°
55°
6
61°
53°
7
69°
54°
8
69°
46°
9
65°
52°
10
68°
54°
11
67°
51°
12
68°
47°
13
69°
47°
14
68°
51°
15
71°
52°
16
73°
45°
17
69°
50°
18
68°
49°
19
70°
48°
20
66°
48°
21
68°
47°
22
69°
48°
23
68°
48°
24
68°
47°
25
65°
47°
26
67°
46°
27
67°
48°
28
65°
47°
29
66°
46°
30
64°
45°
1
65°
44°
2
60°
44°
3
57°
43°
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 57° to 73°, with overnight lows between 43° and 59°. The average high for September is 67° 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 Amherst. See also: October | November | December.
