S
M
T
W
T
F
S
28
79°
60°
29
68°
36°
30
49°
30°
31
59°
26°
1
69°
36°
2
69°
47°
3
75°
56°
4
61°
47°
5
71°
49°
6
76°
55°
7
77°
63°
8
79°
65°
9
79°
67°
10
77°
56°
11
60°
42°
12
53°
32°
13
61°
27°
14
62°
45°
15
50°
29°
16
65°
29°
17
60°
42°
18
48°
29°
19
57°
26°
20
60°
29°
21
68°
36°
22
74°
56°
23
64°
50°
24
67°
46°
25
73°
32°
26
42°
26°
27
48°
21°
28
54°
25°
29
59°
25°
30
62°
35°
31
39°
22°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
January Weather in Petaluma
Petaluma's January 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for January is ° with an average low of °. 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 Petaluma. See also: February | March | April.
