S
M
T
W
T
F
S
30
74°
33°
31
76°
38°
1
79°
40°
2
81°
41°
3
83°
41°
4
76°
35°
5
73°
36°
6
76°
36°
7
75°
31°
8
74°
32°
9
73°
37°
10
72°
34°
11
71°
31°
12
72°
30°
13
71°
32°
14
72°
35°
15
75°
34°
16
81°
32°
17
80°
36°
18
79°
37°
19
80°
34°
20
79°
37°
21
79°
36°
22
78°
36°
23
78°
34°
24
77°
35°
25
70°
35°
26
72°
33°
27
67°
34°
28
68°
35°
29
66°
30°
30
65°
34°
1
68°
33°
2
73°
33°
3
72°
35°
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 65° to 83°, with overnight lows between 30° and 41°. The average high for September is 74° with an average low of 35°. 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.
