S
M
T
W
T
F
S
30
73°
54°
31
73°
51°
1
72°
48°
2
67°
53°
3
67°
50°
4
72°
47°
5
65°
46°
6
64°
52°
7
70°
52°
8
70°
51°
9
71°
52°
10
70°
50°
11
69°
49°
12
69°
47°
13
68°
50°
14
69°
50°
15
69°
48°
16
68°
45°
17
61°
45°
18
63°
48°
19
67°
48°
20
66°
46°
21
66°
47°
22
60°
45°
23
63°
46°
24
64°
46°
25
62°
45°
26
58°
42°
27
57°
45°
28
63°
42°
29
61°
41°
30
56°
39°
1
57°
42°
2
57°
38°
3
55°
38°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in River John
River John's September 2026 forecast shows daily high temperatures ranging from 55° to 73°, with overnight lows between 38° and 54°. The average high for September is 65° with an average low of 47°. 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 River John. See also: October | November | December.
