S
M
T
W
T
F
S
30
78°
57°
31
75°
58°
1
77°
58°
2
81°
52°
3
80°
48°
4
71°
50°
5
71°
57°
6
78°
51°
7
76°
48°
8
70°
49°
9
71°
52°
10
70°
55°
11
71°
54°
12
78°
55°
13
77°
54°
14
77°
47°
15
73°
46°
16
67°
48°
17
68°
44°
18
67°
44°
19
67°
41°
20
65°
41°
21
64°
43°
22
65°
49°
23
68°
42°
24
68°
49°
25
70°
50°
26
67°
49°
27
73°
50°
28
72°
46°
29
71°
43°
30
62°
46°
1
65°
45°
2
70°
48°
3
62°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Hartford
Hartford's September 2026 forecast shows daily high temperatures ranging from 62° to 81°, with overnight lows between 37° and 58°. The average high for September is 71° 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 Hartford. See also: October | November | December.
