S
M
T
W
T
F
S
30
94°
69°
31
92°
69°
1
89°
68°
2
89°
68°
3
92°
67°
4
91°
68°
5
92°
67°
6
91°
68°
7
91°
68°
8
92°
67°
9
91°
68°
10
91°
67°
11
90°
66°
12
89°
66°
13
84°
65°
14
84°
65°
15
85°
64°
16
85°
65°
17
80°
64°
18
82°
64°
19
85°
63°
20
86°
64°
21
87°
57°
22
85°
60°
23
84°
56°
24
83°
53°
25
85°
52°
26
86°
61°
27
87°
61°
28
88°
60°
29
83°
61°
30
83°
60°
1
85°
59°
2
76°
58°
3
81°
58°
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 76° to 94°, with overnight lows between 52° and 69°. The average high for September is 87° with an average low of 63°. 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.
