S
M
T
W
T
F
S
29
18°
-2°
30
14°
5°
1
18°
5°
2
25°
2°
3
24°
10°
4
22°
14°
5
32°
12°
6
32°
11°
7
27°
8°
8
25°
6°
9
28°
5°
10
31°
13°
11
31°
10°
12
Hist. Avg.
19°
2°
13
Hist. Avg.
19°
2°
14
Hist. Avg.
19°
1°
15
Hist. Avg.
18°
1°
16
Hist. Avg.
18°
0°
17
Hist. Avg.
18°
0°
18
Hist. Avg.
18°
0°
19
Hist. Avg.
17°
0°
20
Hist. Avg.
17°
-1°
21
Hist. Avg.
17°
-1°
22
Hist. Avg.
17°
-1°
23
Hist. Avg.
16°
-1°
24
Hist. Avg.
16°
-2°
25
Hist. Avg.
16°
-2°
26
Hist. Avg.
16°
-2°
27
Hist. Avg.
16°
-2°
28
Hist. Avg.
16°
-2°
29
Hist. Avg.
16°
-3°
30
Hist. Avg.
15°
-3°
31
Hist. Avg.
15°
-3°
1
Hist. Avg.
15°
-3°
2
Hist. Avg.
15°
-3°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Killarney
Killarney's December 2026 forecast shows daily high temperatures ranging from 14° to 32°, with overnight lows between -2° and 14°. The average high for December is 25° with an average low of 8°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in Killarney. See also: January | February | March.
