S
M
T
W
T
F
S
30
82°
62°
31
87°
68°
1
84°
69°
2
92°
70°
3
92°
70°
4
83°
67°
5
84°
66°
6
78°
58°
7
81°
57°
8
84°
59°
9
88°
66°
10
81°
66°
11
83°
63°
12
74°
63°
13
85°
63°
14
73°
52°
15
84°
51°
16
86°
68°
17
79°
68°
18
78°
61°
19
78°
57°
20
77°
61°
21
58°
55°
22
63°
56°
23
61°
54°
24
67°
44°
25
68°
43°
26
70°
46°
27
70°
51°
28
68°
48°
29
71°
50°
30
68°
51°
1
69°
51°
2
70°
45°
3
66°
52°
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 58° to 71°, with overnight lows between 43° and 56°. The average high for September is 67° 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.
