S
M
T
W
T
F
S
29
35°
18°
30
19°
1°
1
16°
-1°
2
20°
-4°
3
18°
-5°
4
13°
10°
5
21°
13°
6
29°
12°
7
30°
9°
8
28°
3°
9
23°
8°
10
20°
5°
11
26°
10°
12
24°
5°
13
28°
-4°
14
21°
-9°
15
13°
-7°
16
9°
8°
17
29°
9°
18
29°
11°
19
30°
10°
20
31°
10°
21
28°
9°
22
28°
7°
23
26°
6°
24
22°
7°
25
24°
9°
26
27°
1°
27
28°
-3°
28
24°
0°
29
15°
4°
30
19°
2°
31
19°
-2°
1
15°
1°
2
15°
5°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Perth
Perth's December 2026 forecast shows daily high temperatures ranging from 9° to 35°, with overnight lows between -9° and 18°. The average high for December is 23° 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 December weather will actually feel in Perth. See also: January | February | March.
