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