S
M
T
W
T
F
S
30
76°
62°
31
71°
65°
1
84°
65°
2
75°
64°
3
76°
57°
4
75°
53°
5
73°
54°
6
73°
50°
7
75°
54°
8
72°
60°
9
73°
64°
10
70°
53°
11
65°
50°
12
69°
53°
13
70°
54°
14
70°
53°
15
71°
52°
16
70°
53°
17
73°
49°
18
65°
47°
19
69°
48°
20
72°
54°
21
73°
55°
22
71°
53°
23
70°
52°
24
67°
52°
25
70°
53°
26
69°
51°
27
63°
46°
28
59°
47°
29
59°
46°
30
58°
44°
1
57°
45°
2
57°
49°
3
64°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Barrie
Barrie's September 2026 forecast shows daily high temperatures ranging from 57° to 75°, with overnight lows between 44° and 64°. The average high for September is 68° with an average low of 51°. 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 Barrie. See also: October | November | December.
