S
M
T
W
T
F
S
30
82°
66°
31
87°
69°
1
90°
71°
2
94°
73°
3
94°
72°
4
87°
70°
5
82°
68°
6
79°
59°
7
79°
57°
8
84°
69°
9
80°
64°
10
76°
51°
11
77°
59°
12
80°
58°
13
77°
58°
14
73°
57°
15
72°
55°
16
74°
55°
17
75°
54°
18
76°
53°
19
72°
51°
20
71°
49°
21
71°
54°
22
68°
54°
23
68°
53°
24
75°
54°
25
76°
54°
26
75°
53°
27
75°
53°
28
76°
54°
29
76°
55°
30
75°
55°
1
76°
51°
2
74°
46°
3
61°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Three Rivers
Three Rivers's September 2026 forecast shows daily high temperatures ranging from 61° to 84°, with overnight lows between 44° and 69°. The average high for September is 75° with an average low of 54°. 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 Three Rivers. See also: October | November | December.
