S
M
T
W
T
F
S
30
83°
58°
31
81°
67°
1
75°
63°
2
74°
66°
3
82°
62°
4
83°
62°
5
74°
58°
6
74°
56°
7
78°
60°
8
75°
61°
9
77°
60°
10
80°
62°
11
81°
58°
12
74°
56°
13
75°
56°
14
78°
56°
15
72°
55°
16
71°
59°
17
76°
55°
18
70°
52°
19
70°
51°
20
71°
55°
21
75°
59°
22
78°
59°
23
78°
58°
24
77°
56°
25
75°
55°
26
75°
56°
27
76°
57°
28
76°
56°
29
75°
52°
30
66°
47°
1
65°
47°
2
67°
54°
3
73°
54°
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 65° to 83°, with overnight lows between 47° and 67°. The average high for September is 75° 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.
