S
M
T
W
T
F
S
30
73°
52°
31
72°
53°
1
72°
50°
2
73°
56°
3
79°
56°
4
80°
58°
5
73°
56°
6
80°
55°
7
78°
50°
8
72°
54°
9
71°
48°
10
74°
54°
11
75°
52°
12
76°
50°
13
71°
51°
14
74°
58°
15
78°
53°
16
80°
45°
17
76°
43°
18
67°
42°
19
65°
43°
20
67°
45°
21
67°
45°
22
73°
52°
23
72°
45°
24
69°
42°
25
66°
41°
26
65°
43°
27
66°
42°
28
65°
41°
29
64°
41°
30
66°
40°
1
Hist. Avg.
69°
45°
2
Hist. Avg.
69°
45°
3
Hist. Avg.
68°
44°
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 64° to 80°, with overnight lows between 40° and 58°. The average high for September is 72° 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.
