S
M
T
W
T
F
S
30
104°
73°
31
104°
79°
1
106°
73°
2
104°
73°
3
100°
73°
4
104°
73°
5
104°
73°
6
106°
73°
7
106°
73°
8
106°
77°
9
104°
79°
10
99°
79°
11
97°
73°
12
100°
73°
13
102°
72°
14
102°
73°
15
102°
73°
16
100°
73°
17
99°
75°
18
102°
72°
19
100°
66°
20
100°
66°
21
99°
72°
22
95°
68°
23
91°
68°
24
88°
64°
25
90°
59°
26
93°
63°
27
88°
68°
28
88°
68°
29
93°
72°
30
92°
75°
1
84°
70°
2
76°
67°
3
76°
63°
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 93°, with overnight lows between 63° and 75°. The average high for September is 84° with an average low of 69°. 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.
