S
M
T
W
T
F
S
27
67°
52°
28
68°
49°
29
73°
48°
30
71°
54°
1
70°
61°
2
58°
50°
3
62°
46°
4
72°
46°
5
59°
42°
6
65°
37°
7
75°
53°
8
66°
45°
9
68°
43°
10
59°
49°
11
59°
55°
12
75°
57°
13
86°
59°
14
59°
55°
15
63°
51°
16
67°
44°
17
54°
38°
18
62°
36°
19
68°
37°
20
63°
36°
21
63°
33°
22
63°
36°
23
62°
37°
24
59°
34°
25
68°
35°
26
59°
44°
27
59°
38°
28
72°
43°
29
70°
45°
30
56°
37°
31
59°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Sarnia
Sarnia's October 2026 forecast shows daily high temperatures ranging from 56° to 70°, with overnight lows between 37° and 46°. The average high for October is 62° with an average low of 43°. 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 Sarnia. See also: November | December | January.
