S
M
T
W
T
F
S
30
88°
63°
31
87°
60°
1
83°
59°
2
82°
60°
3
83°
61°
4
85°
64°
5
88°
66°
6
87°
65°
7
87°
63°
8
85°
58°
9
80°
57°
10
80°
57°
11
81°
56°
12
80°
56°
13
79°
57°
14
78°
56°
15
79°
55°
16
80°
59°
17
79°
57°
18
80°
60°
19
83°
60°
20
80°
60°
21
Hist. Avg.
80°
56°
22
Hist. Avg.
80°
55°
23
Hist. Avg.
79°
55°
24
Hist. Avg.
79°
55°
25
Hist. Avg.
79°
54°
26
Hist. Avg.
78°
54°
27
Hist. Avg.
78°
53°
28
Hist. Avg.
78°
53°
29
Hist. Avg.
77°
53°
30
Hist. Avg.
77°
52°
1
Hist. Avg.
77°
52°
2
Hist. Avg.
77°
51°
3
Hist. Avg.
76°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Hartford
Hartford's September 2026 forecast shows daily high temperatures ranging from 78° to 88°, with overnight lows between 55° and 66°. The average high for September is 82° with an average low of 60°. 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.
