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