S
M
T
W
T
F
S
30
74°
49°
31
73°
48°
1
74°
49°
2
72°
47°
3
72°
47°
4
74°
53°
5
76°
52°
6
73°
53°
7
71°
47°
8
73°
46°
9
70°
51°
10
75°
54°
11
77°
52°
12
78°
54°
13
73°
50°
14
73°
46°
15
69°
44°
16
68°
44°
17
65°
51°
18
70°
49°
19
72°
50°
20
71°
42°
21
74°
41°
22
65°
39°
23
62°
40°
24
Hist. Avg.
67°
45°
25
Hist. Avg.
66°
44°
26
Hist. Avg.
66°
44°
27
Hist. Avg.
65°
44°
28
Hist. Avg.
65°
43°
29
Hist. Avg.
64°
43°
30
Hist. Avg.
64°
43°
1
Hist. Avg.
63°
42°
2
Hist. Avg.
63°
42°
3
Hist. Avg.
62°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Harrietta
Harrietta's September 2026 forecast shows daily high temperatures ranging from 62° to 78°, with overnight lows between 39° and 54°. The average high for September is 72° with an average low of 48°. 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 Harrietta. See also: October | November | December.
