S
M
T
W
T
F
S
30
66°
54°
31
67°
50°
1
66°
51°
2
65°
54°
3
65°
49°
4
69°
49°
5
65°
51°
6
67°
50°
7
69°
51°
8
68°
54°
9
69°
51°
10
64°
54°
11
67°
54°
12
65°
53°
13
69°
53°
14
68°
52°
15
68°
51°
16
66°
50°
17
63°
52°
18
62°
50°
19
66°
46°
20
63°
46°
21
62°
45°
22
61°
46°
23
62°
48°
24
63°
51°
25
61°
52°
26
64°
52°
27
65°
51°
28
64°
48°
29
60°
46°
30
59°
45°
1
59°
44°
2
60°
44°
3
60°
46°
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 59° to 69°, with overnight lows between 44° and 54°. The average high for September is 64° 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 Hartford. See also: October | November | December.
