S
M
T
W
T
F
S
27
69°
56°
28
71°
57°
29
71°
55°
30
67°
49°
1
70°
56°
2
64°
54°
3
62°
53°
4
65°
55°
5
66°
55°
6
68°
53°
7
67°
52°
8
61°
49°
9
60°
43°
10
56°
43°
11
57°
51°
12
59°
51°
13
63°
50°
14
65°
52°
15
66°
50°
16
63°
50°
17
60°
41°
18
61°
41°
19
52°
43°
20
53°
45°
21
62°
49°
22
62°
49°
23
61°
48°
24
58°
48°
25
55°
47°
26
58°
47°
27
59°
46°
28
61°
44°
29
53°
43°
30
48°
30°
31
46°
31°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in St. Catharines
St. Catharines's October 2026 forecast shows daily high temperatures ranging from 46° to 71°, with overnight lows between 30° and 57°. The average high for October is 61° with an average low of 48°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in St. Catharines. See also: November | December | January.
