S
M
T
W
T
F
S
30
81°
58°
31
81°
58°
1
83°
59°
2
85°
62°
3
82°
63°
4
85°
58°
5
81°
62°
6
80°
59°
7
79°
62°
8
83°
62°
9
79°
60°
10
78°
61°
11
83°
60°
12
83°
61°
13
82°
60°
14
83°
61°
15
83°
60°
16
82°
61°
17
82°
59°
18
81°
54°
19
79°
55°
20
76°
51°
21
75°
52°
22
74°
57°
23
76°
55°
24
79°
51°
25
79°
54°
26
77°
56°
27
78°
55°
28
77°
54°
29
76°
55°
30
77°
54°
1
76°
52°
2
77°
53°
3
72°
55°
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 72° to 85°, with overnight lows between 51° and 63°. The average high for September is 80° with an average low of 57°. 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.
