S
M
T
W
T
F
S
30
90°
67°
31
94°
67°
1
95°
67°
2
99°
70°
3
99°
69°
4
100°
71°
5
90°
68°
6
77°
66°
7
84°
60°
8
87°
59°
9
91°
59°
10
96°
66°
11
89°
69°
12
82°
69°
13
89°
66°
14
86°
58°
15
81°
59°
16
85°
60°
17
87°
66°
18
86°
60°
19
77°
56°
20
76°
54°
21
74°
53°
22
75°
54°
23
76°
54°
24
79°
53°
25
76°
54°
26
76°
55°
27
80°
57°
28
81°
57°
29
79°
56°
30
79°
57°
1
78°
55°
2
78°
53°
3
77°
55°
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 74° to 89°, with overnight lows between 53° and 69°. The average high for September is 80° with an average low of 58°. 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.
