S
M
T
W
T
F
S
27
45°
37°
28
46°
36°
29
47°
37°
30
47°
37°
31
46°
36°
1
47°
34°
2
45°
33°
3
45°
33°
4
41°
36°
5
42°
36°
6
45°
34°
7
44°
37°
8
45°
36°
9
47°
36°
10
46°
33°
11
47°
31°
12
42°
31°
13
41°
34°
14
46°
32°
15
46°
34°
16
45°
32°
17
46°
31°
18
41°
31°
19
41°
32°
20
43°
31°
21
42°
32°
22
41°
31°
23
46°
34°
24
44°
32°
25
43°
31°
26
41°
37°
27
44°
35°
28
46°
35°
29
Hist. Avg.
42°
34°
30
Hist. Avg.
42°
34°
31
Hist. Avg.
43°
35°
1
Hist. Avg.
43°
35°
2
Hist. Avg.
43°
35°
3
Hist. Avg.
43°
35°
4
Hist. Avg.
43°
35°
5
Hist. Avg.
43°
35°
6
Hist. Avg.
43°
35°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
January Weather in Dumbarton
Dumbarton's January 2027 forecast shows daily high temperatures ranging from 41° to 47°, with overnight lows between 31° and 37°. The average high for January is 44° with an average low of 34°. 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 Dumbarton. See also: February | March | April.
