S
M
T
W
T
F
S
30
97°
62°
31
99°
66°
1
99°
69°
2
99°
70°
3
98°
71°
4
102°
72°
5
104°
70°
6
104°
72°
7
98°
71°
8
103°
66°
9
102°
75°
10
94°
72°
11
84°
70°
12
93°
68°
13
92°
71°
14
95°
70°
15
97°
72°
16
95°
74°
17
98°
70°
18
98°
71°
19
97°
66°
20
96°
65°
21
91°
72°
22
86°
67°
23
83°
61°
24
78°
55°
25
82°
54°
26
84°
59°
27
81°
62°
28
86°
58°
29
88°
65°
30
89°
70°
1
84°
69°
2
77°
63°
3
69°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Harriet
Harriet's September 2026 forecast shows daily high temperatures ranging from 69° to 89°, with overnight lows between 59° and 70°. The average high for September is 81° with an average low of 65°. 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 Harriet. See also: October | November | December.
