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
77°
65°
18
78°
47°
19
70°
52°
20
60°
52°
21
68°
48°
22
63°
46°
23
65°
46°
24
67°
48°
25
70°
49°
26
72°
50°
27
73°
50°
28
70°
48°
29
72°
49°
30
71°
43°
1
65°
45°
2
71°
49°
3
64°
48°
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 60° to 78°, with overnight lows between 43° and 65°. 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 Amherst. See also: October | November | December.
