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°
32°
12
59°
53°
13
66°
52°
14
68°
51°
15
65°
52°
16
63°
48°
17
61°
44°
18
64°
49°
19
53°
37°
20
53°
38°
21
58°
46°
22
60°
46°
23
59°
48°
24
57°
38°
25
51°
33°
26
52°
36°
27
51°
35°
28
53°
36°
29
54°
36°
30
53°
34°
1
54°
34°
2
53°
35°
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 50° to 68°, with overnight lows between 32° and 53°. The average high for April is 57° 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.
