S
M
T
W
T
F
S
27
28°
19°
28
29°
29°
29
37°
28°
30
39°
31°
31
40°
32°
1
41°
29°
2
42°
23°
3
43°
17°
4
32°
15°
5
25°
16°
6
25°
20°
7
26°
24°
8
29°
22°
9
31°
19°
10
31°
12°
11
29°
13°
12
23°
11°
13
24°
8°
14
23°
8°
15
20°
11°
16
21°
13°
17
24°
20°
18
28°
16°
19
30°
12°
20
27°
20°
21
25°
25°
22
33°
24°
23
35°
22°
24
32°
21°
25
30°
22°
26
31°
23°
27
32°
24°
28
26°
19°
29
28°
24°
30
Hist. Avg.
30°
17°
31
Hist. Avg.
30°
17°
1
Hist. Avg.
30°
17°
2
Hist. Avg.
30°
17°
3
Hist. Avg.
30°
17°
4
Hist. Avg.
30°
17°
5
Hist. Avg.
30°
17°
6
Hist. Avg.
30°
17°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
January Weather in Sarnia
Sarnia's January 2027 forecast shows daily high temperatures ranging from 20° to 43°, with overnight lows between 8° and 32°. The average high for January is 30° with an average low of 20°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how January weather will actually feel in Sarnia. See also: February | March | April.
