S
M
T
W
T
F
S
29
49°
32°
30
64°
34°
31
61°
40°
1
43°
36°
2
37°
35°
3
66°
36°
4
50°
37°
5
51°
36°
6
42°
35°
7
38°
29°
8
38°
28°
9
65°
36°
10
43°
38°
11
50°
36°
12
44°
38°
13
67°
39°
14
70°
46°
15
60°
41°
16
64°
44°
17
53°
39°
18
76°
39°
19
49°
35°
20
44°
33°
21
56°
44°
22
58°
41°
23
59°
44°
24
52°
41°
25
51°
40°
26
54°
41°
27
59°
45°
28
55°
44°
29
53°
43°
30
55°
42°
1
54°
41°
2
53°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in St. Catharines
St. Catharines's April 2026 forecast shows daily high temperatures ranging from 51° to 59°, with overnight lows between 40° and 45°. The average high for April is 55° with an average low of 42°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how April weather will actually feel in St. Catharines. See also: May | June | July.
