S
M
T
W
T
F
S
30
70°
51°
31
69°
50°
1
71°
49°
2
71°
48°
3
70°
55°
4
71°
53°
5
71°
48°
6
70°
47°
7
69°
52°
8
70°
54°
9
69°
54°
10
68°
48°
11
68°
46°
12
66°
45°
13
71°
53°
14
71°
52°
15
Hist. Avg.
70°
50°
16
Hist. Avg.
69°
49°
17
Hist. Avg.
69°
49°
18
Hist. Avg.
68°
49°
19
Hist. Avg.
68°
48°
20
Hist. Avg.
68°
48°
21
Hist. Avg.
67°
48°
22
Hist. Avg.
67°
47°
23
Hist. Avg.
66°
47°
24
Hist. Avg.
66°
46°
25
Hist. Avg.
66°
46°
26
Hist. Avg.
65°
46°
27
Hist. Avg.
65°
45°
28
Hist. Avg.
64°
45°
29
Hist. Avg.
64°
44°
30
Hist. Avg.
64°
44°
1
Hist. Avg.
63°
44°
2
Hist. Avg.
63°
43°
3
Hist. Avg.
62°
43°
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 66° to 71°, with overnight lows between 45° and 55°. The average high for September is 70° with an average low of 50°. 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.
