S
M
T
W
T
F
S
30
91°
80°
1
89°
78°
2
85°
79°
3
87°
78°
4
89°
80°
5
90°
78°
6
90°
77°
7
88°
77°
8
87°
77°
9
86°
77°
10
83°
78°
11
88°
77°
12
87°
78°
13
86°
78°
14
87°
77°
15
87°
76°
16
87°
77°
17
86°
77°
18
87°
76°
19
89°
77°
20
88°
78°
21
89°
79°
22
86°
76°
23
88°
78°
24
88°
77°
25
84°
74°
26
86°
72°
27
86°
70°
28
85°
69°
29
85°
74°
30
84°
73°
31
86°
74°
1
85°
75°
2
86°
78°
3
86°
76°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Adelphi
Adelphi's December 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for December is ° with an average low of °. 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 Adelphi. See also: January | February | March.
