S
M
T
W
T
F
S
29
52°
37°
30
72°
36°
31
55°
34°
1
36°
31°
2
56°
34°
3
71°
38°
4
N/A
5
43°
33°
6
44°
24°
7
31°
25°
8
50°
44°
9
63°
38°
10
51°
43°
11
54°
40°
12
61°
46°
13
62°
43°
14
55°
43°
15
56°
39°
16
55°
40°
17
54°
42°
18
59°
36°
19
59°
45°
20
61°
44°
21
59°
46°
22
60°
47°
23
63°
46°
24
60°
43°
25
53°
38°
26
51°
42°
27
52°
40°
28
58°
43°
29
53°
40°
30
53°
45°
1
59°
42°
2
54°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
April Weather in Sarnia
Sarnia's April 2026 forecast shows daily high temperatures ranging from 31° to 63°, with overnight lows between 24° and 47°. The average high for April is 55° with an average low of 41°. 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 Sarnia. See also: May | June | July.
