S
M
T
W
T
F
S
30
83°
61°
31
83°
62°
1
82°
61°
2
79°
61°
3
81°
60°
4
81°
60°
5
82°
59°
6
82°
61°
7
83°
61°
8
84°
60°
9
81°
60°
10
77°
59°
11
81°
60°
12
82°
60°
13
82°
58°
14
70°
47°
15
70°
53°
16
72°
53°
17
71°
51°
18
69°
50°
19
73°
49°
20
77°
54°
21
77°
54°
22
76°
53°
23
75°
44°
24
70°
44°
25
70°
52°
26
72°
53°
27
73°
42°
28
72°
41°
29
65°
45°
30
67°
50°
1
67°
49°
2
71°
51°
3
74°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Harvard
Harvard's September 2026 forecast shows daily high temperatures ranging from 65° to 84°, with overnight lows between 41° and 62°. The average high for September is 76° with an average low of 54°. 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 Harvard. See also: October | November | December.
