S
M
T
W
T
F
S
30
77°
53°
31
78°
47°
1
76°
45°
2
70°
46°
3
71°
46°
4
71°
47°
5
70°
46°
6
69°
46°
7
71°
45°
8
72°
43°
9
70°
45°
10
72°
49°
11
72°
50°
12
68°
48°
13
71°
43°
14
72°
44°
15
69°
48°
16
70°
45°
17
65°
46°
18
64°
45°
19
63°
44°
20
69°
48°
21
69°
42°
22
67°
40°
23
Hist. Avg.
63°
44°
24
Hist. Avg.
63°
43°
25
Hist. Avg.
63°
43°
26
Hist. Avg.
62°
43°
27
Hist. Avg.
62°
43°
28
Hist. Avg.
62°
42°
29
Hist. Avg.
62°
42°
30
Hist. Avg.
61°
42°
1
Hist. Avg.
61°
41°
2
Hist. Avg.
61°
41°
3
Hist. Avg.
60°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Amherst
Amherst's September 2026 forecast shows daily high temperatures ranging from 63° to 78°, with overnight lows between 40° and 53°. The average high for September is 70° with an average low of 46°. 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.
