S
M
T
W
T
F
S
29
47°
38°
30
48°
37°
1
47°
36°
2
47°
35°
3
41°
35°
4
43°
34°
5
45°
35°
6
46°
32°
7
38°
29°
8
36°
27°
9
33°
27°
10
35°
28°
11
37°
32°
12
40°
31°
13
39°
31°
14
33°
20°
15
33°
24°
16
36°
28°
17
39°
29°
18
40°
27°
19
39°
20°
20
36°
20°
21
30°
17°
22
31°
22°
23
30°
27°
24
34°
26°
25
34°
21°
26
33°
15°
27
30°
13°
28
27°
11°
29
27°
12°
30
28°
24°
31
32°
19°
1
37°
16°
2
30°
12°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Harrow
Harrow's December 2026 forecast shows daily high temperatures ranging from 27° to 48°, with overnight lows between 11° and 38°. The average high for December is 37° with an average low of 25°. 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 Harrow. See also: January | February | March.
