S
M
T
W
T
F
S
29
25°
10°
30
26°
19°
1
27°
13°
2
28°
19°
3
29°
24°
4
38°
21°
5
38°
14°
6
28°
13°
7
25°
12°
8
26°
11°
9
22°
13°
10
23°
15°
11
25°
7°
12
24°
7°
13
22°
18°
14
27°
21°
15
31°
18°
16
33°
17°
17
33°
22°
18
32°
20°
19
33°
19°
20
32°
19°
21
29°
18°
22
30°
16°
23
26°
15°
24
27°
16°
25
24°
14°
26
23°
16°
27
26°
16°
28
27°
14°
29
28°
14°
30
30°
-1°
31
19°
8°
1
18°
9°
2
Hist. Avg.
24°
8°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Nepean
Nepean's December 2026 forecast shows daily high temperatures ranging from 18° to 38°, with overnight lows between -1° and 24°. The average high for December is 27° with an average low of 15°. 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 Nepean. See also: January | February | March.
